diff --git a/AGENTS.md b/AGENTS.md
index b277fe9..02f1a16 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,6 +1,6 @@
 # AGENTS.md
 
-État des lieux opérationnel du projet SIRH (backend + frontend), à utiliser comme base sur les prochaines interventions.
+État des lieux opérationnel du projet SIRH (backend + frontend), mis à jour après les évolutions sur heures/absences/validations.
 
 ## 1) Stack et structure
 
@@ -25,81 +25,107 @@ Arborescence clé:
 
 ### Contrats
 - Entité: `Contract`
-- Champs principaux: `name`, `trackingMode`, `weeklyHours`, `isActive`
+- Champs principaux: `name`, `trackingMode`, `weeklyHours`, `isActive`, `type`
 - `trackingMode`:
-  - `TIME`: suivi par heures
-  - `PRESENCE`: suivi présence demi-journées/journées
+  - `TIME`: suivi en heures
+  - `PRESENCE`: suivi en demi-journées/journées
 - Enums backend:
   - `App\Enum\TrackingMode`
-  - `App\Enum\ContractType` (`FORFAIT`, `35H`, `39H`, `INTERIM`, `CUSTOM`)
-- `Contract::getType()` est exposé en API (`contract:read`, `employee:read`)
+  - `App\Enum\ContractType` (`FORFAIT`, `THIRTY_FIVE_HOURS`, `THIRTY_NINE_HOURS`, `INTERIM`, `CUSTOM`)
+- Historique de contrat par employé:
+  - table `employee_contract_periods`
+  - résolu par `App\Service\Contracts\EmployeeContractResolver`
 
 ### Heures / absences
-- Les absences sont découpées en enregistrements journaliers (pas de période unique stockée).
-- Une ligne d’heures validée est verrouillée côté métier.
-- Règles de crédit absence (`countAsWorkedHours=true`) gérées dans `WorkedHoursCreditPolicy`:
-  - contrats présence: crédit en unités de présence
-  - contrats temps: crédit en minutes selon règles contrat (35h, 39h, 4h, fallback)
+- Les absences sont stockées en **lignes journalières** (découpage automatique dans `AbsenceWriteProcessor`).
+- Les absences `countAsWorkedHours=true` créditent:
+  - minutes (contrats TIME)
+  - unités de présence (contrats PRESENCE)
+- Les absences AM/PM effacent les plages horaires concernées.
 
-## 4) Écrans principaux
+## 4) Validations (important)
 
-### Page Heures (`frontend/pages/hours.vue`)
-- Vue Jour + Vue Semaine (semaine réservée admin)
-- Toolbar dédiée: `frontend/components/hours/HoursToolbar.vue`
-- Vue jour: `frontend/components/hours/HoursDayView.vue`
-- Vue semaine: `frontend/components/hours/HoursWeekView.vue`
-- Logique page: `frontend/composables/useHoursPage.ts`
+### Validation RH (admin)
+- Champ: `work_hours.is_valid`
+- Endpoint API Platform standard: `PATCH /api/work_hours/{id}`
+- Gérée côté front par `updateWorkHourValidation`.
 
-### Points UX déjà en place
-- Toolbar semaine: raccourcis semaine précédente / actuelle / suivante
-- Légende absences affichée dans la toolbar (admin + vue semaine)
-- Cellules semaine avec absence: couleur du type d’absence (plus rouge fixe)
-- Pour user non-admin: restrictions d’édition selon validations/absences
+### Validation site (chef de site)
+- Champ: `work_hours.is_site_valid`
+- Endpoint dédié: `PATCH /api/work_hours/{id}/site-validation`
+- Processor: `src/State/WorkHourSiteValidationProcessor.php`
+- Autorisé uniquement aux utilisateurs "Sites" (ni `ROLE_ADMIN`, ni `ROLE_SELF`) dans leur scope site.
 
-## 5) API / calculs hebdo
+### Règles de verrouillage
+- `is_valid=true`: ligne verrouillée pour tout le monde (admin inclus pour saisie heures/absence; peut toujours décocher validation RH).
+- `is_site_valid=true`:
+  - non-admin: ligne verrouillée (heures + absences)
+  - admin: ligne éditable
+- Toute modification de ligne (heures/présence/absence) remet:
+  - `is_site_valid=false`
+  - `is_valid=false`
+
+## 5) Page Heures (front)
+
+- Page: `frontend/pages/hours.vue`
+- Composable principal: `frontend/composables/useHoursPage.ts`
+- Composants:
+  - `frontend/components/hours/HoursToolbar.vue`
+  - `frontend/components/hours/HoursDayView.vue`
+  - `frontend/components/hours/HoursWeekView.vue`
+
+### Comportement par profil (vue jour)
+- Admin:
+  - colonne RH avec checkbox
+  - badge `Site validé` affiché près du site
+- Chef de site:
+  - colonne `Validation site` avec checkbox
+  - colonne RH en lecture (`Validé`/`-`)
+- Employé:
+  - colonne `Validation site` en lecture
+  - colonne RH en lecture
+
+## 6) Résumé hebdo / calculs
 
 - Provider: `src/State/WorkHourWeeklySummaryProvider.php`
 - DTOs:
   - `src/Dto/WorkHours/WeeklySummaryRow.php`
   - `src/Dto/WorkHours/WeeklyDaySummary.php`
-- Le résumé hebdo renvoie notamment:
-  - `trackingMode`
-  - `contractName`
-  - `contractType`
-  - détails journaliers (jour/nuit/total, présence, absence label/couleur)
+- Inclut: contrat résolu par jour, absences, crédits, jour/nuit/total, majorations, récup.
 
-### Heures supp
-- Règles métier:
-  - contrats <= 35h: tranche 25% de 35h à 43h, puis 50% au-delà
-  - contrats >= 39h: tranche 25% de 39h à 43h, puis 50% au-delà
-  - contrats `INTERIM`: pas de bonus 25/50 ni récup
+Règles majorations:
+- Contrats <= 35h: +25% de 35h à 43h, +50% au-delà
+- Contrats >= 39h: +25% de 39h à 43h, +50% au-delà
+- `INTERIM`: pas de 25% / 50% / récup
 
-## 6) Conventions techniques
+## 7) Migrations sensibles
 
-- Favoriser DTO explicites plutôt que tableaux associatifs bruts.
-- Utiliser les interfaces repository dans providers/processors testés.
-- Centraliser les règles métier dans services/providers backend plutôt que dupliquer côté front.
-- Front: éviter les calculs métier lourds; consommer les champs API déjà calculés.
+- `migrations/Version20260226183000.php`
+  - ajoute `work_hours.is_site_valid BOOLEAN NOT NULL DEFAULT FALSE`
+  - non destructive (pas de perte de données)
 
-## 7) Tests et qualité
+## 8) Points de vigilance prod
 
-- Les TU backend passent actuellement via `make test`.
-- Le build frontend passe via `npm run build`.
-- À chaque évolution métier:
-  - mettre à jour les tests provider/processor/service impactés
-  - maintenir la cohérence des DTO TypeScript (`frontend/services/dto/*`)
+- Toujours exécuter migration avant déploiement code backend/front lié.
+- Après déploiement backend, si route manquante côté runtime:
+  - `php bin/console cache:clear && php bin/console cache:warmup`
+- Vérifier présence route:
+  - `/api/work_hours/{id}/site-validation` (PATCH)
 
-## 8) Fichiers sensibles (à lire avant modif)
+## 9) Conventions techniques
 
+- Favoriser DTO explicites plutôt que tableaux associatifs.
+- Garder règles métier dans backend (providers/processors/services), front orienté affichage/interaction.
+- Maintenir alignement backend DTO PHP / frontend DTO TS (`frontend/services/dto/*`).
+- Mettre à jour TU si signature constructor/service change.
+
+## 10) Fichiers à lire avant modification
+
+- `src/State/WorkHourBulkUpsertProcessor.php`
+- `src/State/AbsenceWriteProcessor.php`
+- `src/State/WorkHourSiteValidationProcessor.php`
 - `src/State/WorkHourWeeklySummaryProvider.php`
 - `src/Service/WorkHours/WorkedHoursCreditPolicy.php`
-- `src/State/AbsenceWriteProcessor.php`
-- `src/State/WorkHourBulkUpsertProcessor.php`
 - `frontend/composables/useHoursPage.ts`
+- `frontend/components/hours/HoursDayView.vue`
 - `frontend/components/hours/HoursWeekView.vue`
-
-## 9) Décisions de conception actuelles
-
-- Les absences sont stockées par jour (facilite verrouillage/édition fine).
-- Les règles de calcul (crédits, majorations, récup) sont portées côté backend.
-- Le front reste centré sur l’affichage/interaction et réutilise les données enrichies de l’API.
diff --git a/frontend/components/AbsencePrintDrawer.vue b/frontend/components/AbsencePrintDrawer.vue
index c4729dd..0685439 100644
--- a/frontend/components/AbsencePrintDrawer.vue
+++ b/frontend/components/AbsencePrintDrawer.vue
@@ -54,6 +54,48 @@
                 </p>
             </div>
 
+            <div class="space-y-2">
+                <p class="text-md font-semibold text-neutral-700">
+                    Type de contrat <span class="text-red-600">*</span>
+                </p>
+                <div class="flex flex-wrap gap-4 rounded-md border border-neutral-300 px-3 py-2">
+                    <div v-for="nature in contractNatures" :key="nature.value" class="flex items-center gap-2">
+                        <label class="text-md" :for="`print-contract-nature-${nature.value}`">{{ nature.label }}</label>
+                        <input
+                            :id="`print-contract-nature-${nature.value}`"
+                            v-model="printForm.contractNatures"
+                            :value="nature.value"
+                            type="checkbox"
+                            class="h-4 w-4"
+                        />
+                    </div>
+                </div>
+                <p v-if="showContractNaturesError" class="text-sm text-red-600">
+                    Sélectionne au moins un type de contrat.
+                </p>
+            </div>
+
+            <div class="space-y-2">
+                <p class="text-md font-semibold text-neutral-700">
+                    Temps de travail <span class="text-red-600">*</span>
+                </p>
+                <div class="flex flex-wrap gap-4 rounded-md border border-neutral-300 px-3 py-2">
+                    <div v-for="workContract in workContracts" :key="workContract.id" class="flex items-center gap-2">
+                        <label class="text-md" :for="`print-work-contract-${workContract.id}`">{{ workContract.name }}</label>
+                        <input
+                            :id="`print-work-contract-${workContract.id}`"
+                            v-model="printForm.workContractIds"
+                            :value="workContract.id"
+                            type="checkbox"
+                            class="h-4 w-4"
+                        />
+                    </div>
+                </div>
+                <p v-if="showWorkContractsError" class="text-sm text-red-600">
+                    Sélectionne au moins un temps de travail.
+                </p>
+            </div>
+
             <div class="flex justify-end gap-3 pt-2">
                 <button
                     type="button"
@@ -84,13 +126,27 @@ type SiteOption = {
     color: string
 }
 
+type ContractNatureOption = {
+    value: 'CDI' | 'CDD' | 'INTERIM'
+    label: string
+}
+
+type WorkContractOption = {
+    id: number
+    name: string
+}
+
 const props = defineProps<{
     modelValue: boolean
     sites: SiteOption[]
+    contractNatures: ContractNatureOption[]
+    workContracts: WorkContractOption[]
     printForm: {
         from: string
         to: string
         siteIds: number[]
+        contractNatures: Array<'CDI' | 'CDD' | 'INTERIM'>
+        workContractIds: number[]
     }
 }>()
 
@@ -110,19 +166,36 @@ const printForm = toRef(props, 'printForm')
 const validationTouched = reactive({
     from: false,
     to: false,
-    sites: false
+    sites: false,
+    contractNatures: false,
+    workContracts: false
 })
 
 const isFromValid = computed(() => printForm.value.from.trim() !== '')
 const isToValid = computed(() => printForm.value.to.trim() !== '')
 const isSitesValid = computed(() => printForm.value.siteIds.length > 0)
+const isContractNaturesValid = computed(() => {
+    if (props.contractNatures.length === 0) return true
+    return printForm.value.contractNatures.length > 0
+})
+const isWorkContractsValid = computed(() => {
+    if (props.workContracts.length === 0) return true
+    return printForm.value.workContractIds.length > 0
+})
 const isFormValid = computed(
-    () => isFromValid.value && isToValid.value && isSitesValid.value
+    () =>
+        isFromValid.value &&
+        isToValid.value &&
+        isSitesValid.value &&
+        isContractNaturesValid.value &&
+        isWorkContractsValid.value
 )
 
 const showFromError = computed(() => validationTouched.from && !isFromValid.value)
 const showToError = computed(() => validationTouched.to && !isToValid.value)
 const showSitesError = computed(() => validationTouched.sites && !isSitesValid.value)
+const showContractNaturesError = computed(() => validationTouched.contractNatures && !isContractNaturesValid.value)
+const showWorkContractsError = computed(() => validationTouched.workContracts && !isWorkContractsValid.value)
 
 const baseInputClass =
     'mt-2 w-full rounded-md border px-3 py-2 text-md text-neutral-900'
@@ -150,6 +223,8 @@ const handleSubmit = () => {
     validationTouched.from = true
     validationTouched.to = true
     validationTouched.sites = true
+    validationTouched.contractNatures = true
+    validationTouched.workContracts = true
     if (!isFormValid.value) return
     emit('submit')
 }
@@ -166,6 +241,8 @@ watch(
             validationTouched.from = false
             validationTouched.to = false
             validationTouched.sites = false
+            validationTouched.contractNatures = false
+            validationTouched.workContracts = false
         }
     }
 )
diff --git a/frontend/components/hours/HoursDayView.vue b/frontend/components/hours/HoursDayView.vue
index d8a090f..b1c8322 100644
--- a/frontend/components/hours/HoursDayView.vue
+++ b/frontend/components/hours/HoursDayView.vue
@@ -52,14 +52,15 @@
             </span>
           </p>
         </div>
-          <div class="pl-2 min-w-0 self-stretch flex flex-col justify-between py-0.5">
-              <p
-                  class="w-full min-w-0 text-sm text-neutral-700 truncate"
-                  :class="getRowAbsenceLabel(employee.id) ? '' : 'invisible'"
+          <div class="pl-2 min-w-0 self-stretch flex flex-col gap-1 justify-between py-0.5">
+                <p
+                  class="w-full min-w-0 rounded-md px-2 py-1 text-xs truncate"
+                  :class="getRowAbsenceLabel(employee.id) ? 'text-white' : 'invisible'"
                   :title="getRowAbsenceLabel(employee.id) || ''"
-              >
+                  :style="getRowAbsenceStyle(employee.id)"
+                >
                   {{ getRowAbsenceLabel(employee.id) || '—' }}
-              </p>
+                </p>
               <button
                   type="button"
                   class="self-start text-left text-xs font-semibold underline"
@@ -197,6 +198,7 @@ const props = defineProps<{
   onToggleValidationBulk: (checked: boolean) => void
   getRowMetrics: (employeeId: number) => { dayMinutes: number; nightMinutes: number; totalMinutes: number }
   getRowAbsenceLabel: (employeeId: number) => string
+  getRowAbsenceStyle: (employeeId: number) => { backgroundColor: string } | undefined
   getPresenceDayValue: (employeeId: number) => string
   onAbsenceClick: (employeeId: number) => void
   formatMinutes: (minutes: number) => string
diff --git a/frontend/composables/useHoursPage.ts b/frontend/composables/useHoursPage.ts
index 35eb5d6..b8379ad 100644
--- a/frontend/composables/useHoursPage.ts
+++ b/frontend/composables/useHoursPage.ts
@@ -419,6 +419,12 @@ export const useHoursPage = () => {
     return `${dayRow.absenceLabel} (journée)`
   }
 
+  const getRowAbsenceStyle = (employeeId: number) => {
+    const dayRow = dayContextByEmployeeId.value.get(employeeId)
+    if (!dayRow?.absenceLabel) return undefined
+    return { backgroundColor: dayRow.absenceColor || '#dc2626' }
+  }
+
   const getPresenceDayValue = (employeeId: number) => {
     const row = rows.value[employeeId]
     const basePresence = (row?.isPresentMorning ? 0.5 : 0) + (row?.isPresentAfternoon ? 0.5 : 0)
@@ -964,6 +970,7 @@ export const useHoursPage = () => {
     toggleValidationBulk,
     getRowMetrics,
     getRowAbsenceLabel,
+    getRowAbsenceStyle,
     getPresenceDayValue,
     openAbsenceDrawer,
     submitAbsence,
diff --git a/frontend/pages/calendar.vue b/frontend/pages/calendar.vue
index 8734c6b..88c183a 100644
--- a/frontend/pages/calendar.vue
+++ b/frontend/pages/calendar.vue
@@ -86,6 +86,8 @@
         <AbsencePrintDrawer
             v-model="isPrintOpen"
             :sites="sites"
+            :contract-natures="contractNatureOptions"
+            :work-contracts="workContractOptions"
             :print-form="printForm"
             @submit="handlePrint"
             @cancel="closePrint"
@@ -221,7 +223,25 @@ const form = reactive({
 const printForm = reactive({
     from: '',
     to: '',
-    siteIds: [] as number[]
+    siteIds: [] as number[],
+    contractNatures: [] as Array<'CDI' | 'CDD' | 'INTERIM'>,
+    workContractIds: [] as number[]
+})
+
+const contractNatureOptions = [
+    { value: 'CDI' as const, label: 'CDI' },
+    { value: 'CDD' as const, label: 'CDD' },
+    { value: 'INTERIM' as const, label: 'Intérim' }
+]
+
+const workContractOptions = computed(() => {
+    const byId = new Map<number, { id: number; name: string }>()
+    for (const employee of employees.value) {
+        const contract = employee.contract
+        if (!contract?.id) continue
+        byId.set(contract.id, { id: contract.id, name: contract.name })
+    }
+    return Array.from(byId.values()).sort((a, b) => a.name.localeCompare(b.name, 'fr'))
 })
 
 // Remet le formulaire à zéro.
@@ -249,6 +269,8 @@ const openPrint = () => {
     printForm.from = monthStart
     printForm.to = monthEnd
     printForm.siteIds = [...selectedSiteIds.value]
+    printForm.contractNatures = contractNatureOptions.map((item) => item.value)
+    printForm.workContractIds = workContractOptions.value.map((item) => item.id)
     isPrintOpen.value = true
 }
 
@@ -657,6 +679,12 @@ const handlePrint = async () => {
     if (printForm.siteIds.length > 0) {
         params.set('sites', printForm.siteIds.join(','))
     }
+    if (printForm.contractNatures.length > 0) {
+        params.set('contractNatures', printForm.contractNatures.join(','))
+    }
+    if (printForm.workContractIds.length > 0) {
+        params.set('workContracts', printForm.workContractIds.join(','))
+    }
     await printPdf(`/absences/print?${params.toString()}`)
     isPrintOpen.value = false
 }
diff --git a/frontend/pages/employees.vue b/frontend/pages/employees.vue
index 3994250..aa08583 100644
--- a/frontend/pages/employees.vue
+++ b/frontend/pages/employees.vue
@@ -11,7 +11,7 @@
             <button
                 type="button"
                 class="rounded-lg bg-primary-500 px-4 py-2 text-md font-semibold text-white hover:bg-secondary-500"
-                @click="isDrawerOpen = true"
+                @click="openCreate"
             >
                 Ajouter un employé
             </button>
@@ -32,10 +32,11 @@
     <div v-else class="flex-1 min-h-0 rounded-lg border border-neutral-200 bg-white overflow-hidden">
       <div class="h-full overflow-auto">
         <div class="min-w-[900px]">
-          <div class="grid grid-cols-[120px_1fr_1fr_220px_200px] gap-4 border-b border-neutral-200 bg-tertiary-500 px-6 py-3 text-md font-semibold text-neutral-700 sticky top-0 z-10">
+          <div class="grid grid-cols-[120px_1fr_1fr_180px_180px_200px] gap-4 border-b border-neutral-200 bg-tertiary-500 px-6 py-3 text-md font-semibold text-neutral-700 sticky top-0 z-10">
             <span class="text-left">Prénom</span>
             <span class="text-left">Nom</span>
             <span class="text-left">Site</span>
+            <span class="text-left">Nature</span>
             <span class="text-left">Contrat</span>
             <span class="text-right">Actions</span>
           </div>
@@ -46,7 +47,7 @@
             <div
               v-for="employee in filteredEmployees"
               :key="employee.id"
-              class="grid grid-cols-[120px_1fr_1fr_220px_200px] items-center gap-4 border-b border-neutral-100 px-6 py-3 text-md text-neutral-800 last:border-b-0"
+              class="grid grid-cols-[120px_1fr_1fr_180px_180px_200px] items-center gap-4 border-b border-neutral-100 px-6 py-3 text-md text-neutral-800 last:border-b-0"
             >
               <span>{{ employee.firstName }}</span>
               <span>{{ employee.lastName }}</span>
@@ -57,6 +58,7 @@
               >
                 {{ employee.site?.name ?? '-' }}
               </span>
+              <span>{{ contractNatureLabel(employee.currentContractNature) }}</span>
               <span>{{ employee.contract?.name ?? '-' }}</span>
               <div class="flex items-center justify-end gap-2">
                 <button
@@ -128,24 +130,72 @@
             Le site est obligatoire.
           </p>
         </div>
-        <div>
-          <label class="text-md font-semibold text-neutral-700" for="contract">
-            Contrat <span class="text-red-600">*</span>
-          </label>
-          <select
-            id="contract"
-            v-model="form.contractId"
-            :class="contractFieldClass"
-          >
-            <option value="">Sélectionner un contrat</option>
-            <option v-for="contract in contracts" :key="contract.id" :value="contract.id">
-              {{ contract.name }}
-            </option>
-          </select>
-          <p v-if="showContractError" class="mt-1 text-sm text-red-600">
-            Le contrat est obligatoire.
-          </p>
-        </div>
+        <template v-if="!editingEmployee">
+          <div>
+            <label class="text-md font-semibold text-neutral-700" for="contract-nature">
+              Type de contrat <span class="text-red-600">*</span>
+            </label>
+            <select
+              id="contract-nature"
+              v-model="form.contractNature"
+              :class="contractNatureFieldClass"
+            >
+              <option value="CDI">CDI</option>
+              <option value="CDD">CDD</option>
+              <option value="INTERIM">Intérim</option>
+            </select>
+            <p v-if="showContractNatureError" class="mt-1 text-sm text-red-600">
+              Le type de contrat est obligatoire.
+            </p>
+          </div>
+          <div>
+              <label class="text-md font-semibold text-neutral-700" for="contract">
+                  Temps de travail <span class="text-red-600">*</span>
+              </label>
+              <select
+                  id="contract"
+                  v-model="form.contractId"
+                  :class="contractFieldClass"
+              >
+                  <option value="">Sélectionner un contrat</option>
+                  <option v-for="contract in contracts" :key="contract.id" :value="contract.id">
+                      {{ contract.name }}
+                  </option>
+              </select>
+              <p v-if="showContractError" class="mt-1 text-sm text-red-600">
+                  Le temps de travail est obligatoire.
+              </p>
+          </div>
+          <div>
+            <label class="text-md font-semibold text-neutral-700" for="contract-start-date">
+              Début contrat <span class="text-red-600">*</span>
+            </label>
+            <input
+              id="contract-start-date"
+              v-model="form.contractStartDate"
+              type="date"
+              :class="contractStartDateFieldClass"
+            />
+            <p v-if="showContractStartDateError" class="mt-1 text-sm text-red-600">
+              La date de début est obligatoire.
+            </p>
+          </div>
+          <div v-if="requiresContractEndDate">
+            <label class="text-md font-semibold text-neutral-700" for="contract-end-date">
+              Fin contrat
+              <span v-if="requiresContractEndDate" class="text-red-600">*</span>
+            </label>
+            <input
+              id="contract-end-date"
+              v-model="form.contractEndDate"
+              type="date"
+              :class="contractEndDateFieldClass"
+            />
+            <p v-if="showContractEndDateError" class="mt-1 text-sm text-red-600">
+              La date de fin est obligatoire pour un CDD ou un intérim.
+            </p>
+          </div>
+        </template>
         <div class="flex justify-end gap-3 pt-2">
           <button
             type="button"
@@ -212,26 +262,54 @@ const filteredEmployees = computed(() => {
   })
 })
 
+const contractNatureLabel = (value?: 'CDI' | 'CDD' | 'INTERIM') => {
+  if (value === 'CDD') return 'CDD'
+  if (value === 'INTERIM') return 'Intérim'
+  return 'CDI'
+}
+
 const form = reactive({
   firstName: '',
   lastName: '',
   siteId: '' as number | '',
-  contractId: '' as number | ''
+  contractId: '' as number | '',
+  contractNature: 'CDI' as 'CDI' | 'CDD' | 'INTERIM',
+  contractStartDate: '',
+  contractEndDate: ''
 })
 
 const validationTouched = reactive({
   firstName: false,
   lastName: false,
   siteId: false,
-  contractId: false
+  contractId: false,
+  contractNature: false,
+  contractStartDate: false,
+  contractEndDate: false
 })
 
 const isFirstNameValid = computed(() => form.firstName.trim() !== '')
 const isLastNameValid = computed(() => form.lastName.trim() !== '')
 const isSiteValid = computed(() => form.siteId !== '')
 const isContractValid = computed(() => form.contractId !== '')
+const isContractNatureValid = computed(() => ['CDI', 'CDD', 'INTERIM'].includes(form.contractNature))
+const isContractStartDateValid = computed(() => form.contractStartDate !== '')
+const requiresContractEndDate = computed(() => form.contractNature === 'CDD' || form.contractNature === 'INTERIM')
+const isContractEndDateValid = computed(() => {
+  if (!requiresContractEndDate.value) return true
+  return form.contractEndDate !== ''
+})
 const isFormValid = computed(
-  () => isFirstNameValid.value && isLastNameValid.value && isSiteValid.value && isContractValid.value
+  () =>
+    isFirstNameValid.value &&
+    isLastNameValid.value &&
+    isSiteValid.value &&
+    (editingEmployee.value
+      ? true
+      : (isContractValid.value &&
+        isContractNatureValid.value &&
+        isContractStartDateValid.value &&
+        isContractEndDateValid.value))
 )
 
 const showFirstNameError = computed(
@@ -246,6 +324,15 @@ const showSiteError = computed(
 const showContractError = computed(
   () => validationTouched.contractId && !isContractValid.value
 )
+const showContractNatureError = computed(
+  () => !editingEmployee.value && validationTouched.contractNature && !isContractNatureValid.value
+)
+const showContractStartDateError = computed(
+  () => !editingEmployee.value && validationTouched.contractStartDate && !isContractStartDateValid.value
+)
+const showContractEndDateError = computed(
+  () => !editingEmployee.value && validationTouched.contractEndDate && !isContractEndDateValid.value
+)
 
 const baseInputClass =
   'mt-2 w-full rounded-md border px-3 py-2 text-base text-neutral-900 focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-secondary-500/20'
@@ -277,6 +364,26 @@ const contractFieldClass = computed(() => {
   }
   return `${baseClass} border-neutral-300`
 })
+const contractNatureFieldClass = computed(() => {
+  const baseClass =
+    'mt-2 w-full rounded-md border bg-white px-3 py-2 text-md text-neutral-900'
+  if (showContractNatureError.value) {
+    return `${baseClass} border-red-500`
+  }
+  return `${baseClass} border-neutral-300`
+})
+const contractStartDateFieldClass = computed(() => {
+  if (showContractStartDateError.value) {
+    return `${baseInputClass} border-red-500`
+  }
+  return `${baseInputClass} border-neutral-300`
+})
+const contractEndDateFieldClass = computed(() => {
+  if (showContractEndDateError.value) {
+    return `${baseInputClass} border-red-500`
+  }
+  return `${baseInputClass} border-neutral-300`
+})
 
 const submitButtonClass = computed(() => {
   if (isSubmitting.value || !isFormValid.value) {
@@ -304,6 +411,9 @@ const loadContracts = async () => {
 
 onMounted(async () => {
   await Promise.all([loadEmployees(), loadSites(), loadContracts()])
+  if (form.contractStartDate === '') {
+    form.contractStartDate = new Date().toISOString().slice(0, 10)
+  }
 })
 
 watch(sites, (nextSites) => {
@@ -324,7 +434,12 @@ const handleSubmit = async () => {
   validationTouched.firstName = true
   validationTouched.lastName = true
   validationTouched.siteId = true
-  validationTouched.contractId = true
+  if (!editingEmployee.value) {
+    validationTouched.contractId = true
+    validationTouched.contractNature = true
+    validationTouched.contractStartDate = true
+    validationTouched.contractEndDate = true
+  }
   if (!isFormValid.value) return
 
   isSubmitting.value = true
@@ -334,14 +449,17 @@ const handleSubmit = async () => {
         firstName: form.firstName,
         lastName: form.lastName,
         siteId: form.siteId === '' ? null : Number(form.siteId),
-        contractId: Number(form.contractId)
+        contractId: editingEmployee.value.contract?.id ?? Number(form.contractId)
       })
     } else {
       await createEmployee({
         firstName: form.firstName,
         lastName: form.lastName,
         siteId: form.siteId === '' ? null : Number(form.siteId),
-        contractId: Number(form.contractId)
+        contractId: Number(form.contractId),
+        contractNature: form.contractNature,
+        contractStartDate: form.contractStartDate,
+        contractEndDate: requiresContractEndDate.value ? form.contractEndDate : null
       })
     }
 
@@ -349,6 +467,9 @@ const handleSubmit = async () => {
     form.lastName = ''
     form.siteId = ''
     form.contractId = ''
+    form.contractNature = 'CDI'
+    form.contractStartDate = new Date().toISOString().slice(0, 10)
+    form.contractEndDate = ''
     editingEmployee.value = null
     isDrawerOpen.value = false
     await loadEmployees()
@@ -363,6 +484,15 @@ watch(isDrawerOpen, (isOpen) => {
     validationTouched.lastName = false
     validationTouched.siteId = false
     validationTouched.contractId = false
+    validationTouched.contractNature = false
+    validationTouched.contractStartDate = false
+    validationTouched.contractEndDate = false
+  }
+})
+
+watch(requiresContractEndDate, (required) => {
+  if (!required) {
+    form.contractEndDate = ''
   }
 })
 
@@ -371,7 +501,18 @@ const openEdit = (employee: Employee) => {
   form.firstName = employee.firstName
   form.lastName = employee.lastName
   form.siteId = employee.site?.id ?? ''
-  form.contractId = employee.contract?.id ?? ''
+  isDrawerOpen.value = true
+}
+
+const openCreate = () => {
+  editingEmployee.value = null
+  form.firstName = ''
+  form.lastName = ''
+  form.siteId = ''
+  form.contractId = ''
+  form.contractNature = 'CDI'
+  form.contractStartDate = new Date().toISOString().slice(0, 10)
+  form.contractEndDate = ''
   isDrawerOpen.value = true
 }
 
diff --git a/frontend/pages/hours.vue b/frontend/pages/hours.vue
index 95aa8b9..b32c2da 100644
--- a/frontend/pages/hours.vue
+++ b/frontend/pages/hours.vue
@@ -61,6 +61,7 @@
                 :on-toggle-validation-bulk="toggleValidationBulk"
                 :get-row-metrics="getRowMetrics"
                 :get-row-absence-label="getRowAbsenceLabel"
+                :get-row-absence-style="getRowAbsenceStyle"
                 :get-presence-day-value="getPresenceDayValue"
                 :on-absence-click="openAbsenceDrawer"
                 :format-minutes="formatMinutes"
@@ -163,6 +164,7 @@ const {
   toggleValidationBulk,
   getRowMetrics,
   getRowAbsenceLabel,
+  getRowAbsenceStyle,
   getPresenceDayValue,
   openAbsenceDrawer,
   submitAbsence,
diff --git a/frontend/services/dto/employee.ts b/frontend/services/dto/employee.ts
index 07258ed..8f8c5a8 100644
--- a/frontend/services/dto/employee.ts
+++ b/frontend/services/dto/employee.ts
@@ -7,5 +7,8 @@ export type Employee = {
   lastName: string
   site: Site
   contract?: Contract | null
+  currentContractNature?: 'CDI' | 'CDD' | 'INTERIM'
+  currentContractStartDate?: string | null
+  currentContractEndDate?: string | null
   displayOrder?: number
 }
diff --git a/frontend/services/dto/work-hour.ts b/frontend/services/dto/work-hour.ts
index 3a6d6bf..7f4dbac 100644
--- a/frontend/services/dto/work-hour.ts
+++ b/frontend/services/dto/work-hour.ts
@@ -70,6 +70,7 @@ export type WorkHourDayContextRow = {
   employeeId: number
   hasContractAtDate: boolean
   absenceLabel?: string | null
+  absenceColor?: string | null
   absenceHalf?: 'AM' | 'PM' | null
   absentMorning: boolean
   absentAfternoon: boolean
diff --git a/frontend/services/employees.ts b/frontend/services/employees.ts
index af14e27..a2977c9 100644
--- a/frontend/services/employees.ts
+++ b/frontend/services/employees.ts
@@ -26,13 +26,19 @@ export const createEmployee = async (payload: {
   lastName: string
   siteId?: number | null
   contractId: number
+  contractNature?: 'CDI' | 'CDD' | 'INTERIM'
+  contractStartDate?: string
+  contractEndDate?: string | null
 }) => {
   const api = useApi()
   return api.post<Employee>('/employees', {
     firstName: payload.firstName,
     lastName: payload.lastName,
     site: payload.siteId ? `/api/sites/${payload.siteId}` : null,
-    contract: `/api/contracts/${payload.contractId}`
+    contract: `/api/contracts/${payload.contractId}`,
+    contractNature: payload.contractNature,
+    contractStartDate: payload.contractStartDate,
+    contractEndDate: payload.contractEndDate ?? null
   }, {
     toastSuccessKey: 'success.employee.create',
     toastErrorKey: 'errors.employee.create'
@@ -46,6 +52,9 @@ export const updateEmployee = async (
     lastName: string
     siteId?: number | null
     contractId: number
+    contractNature?: 'CDI' | 'CDD' | 'INTERIM'
+    contractStartDate?: string
+    contractEndDate?: string | null
     displayOrder?: number
   }
 ) => {
@@ -55,6 +64,9 @@ export const updateEmployee = async (
     lastName: payload.lastName,
     site: payload.siteId ? `/api/sites/${payload.siteId}` : null,
     contract: `/api/contracts/${payload.contractId}`,
+    contractNature: payload.contractNature,
+    contractStartDate: payload.contractStartDate,
+    contractEndDate: payload.contractEndDate ?? null,
     displayOrder: payload.displayOrder
   }, {
     toastSuccessKey: 'success.employee.update',
diff --git a/migrations/Version20260226203000.php b/migrations/Version20260226203000.php
new file mode 100644
index 0000000..520e41b
--- /dev/null
+++ b/migrations/Version20260226203000.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20260226203000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add contract nature to employee contract periods';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql("ALTER TABLE employee_contract_periods ADD contract_nature VARCHAR(20) DEFAULT 'CDI' NOT NULL");
+        $this->addSql("
+            UPDATE employee_contract_periods p
+            SET contract_nature = 'INTERIM'
+            FROM contracts c
+            WHERE p.contract_id = c.id
+              AND LOWER(c.name) LIKE '%interim%'
+        ");
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE employee_contract_periods DROP contract_nature');
+    }
+}
diff --git a/migrations/Version20260226210000.php b/migrations/Version20260226210000.php
new file mode 100644
index 0000000..97522a3
--- /dev/null
+++ b/migrations/Version20260226210000.php
@@ -0,0 +1,82 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+use Doctrine\Migrations\Exception\IrreversibleMigration;
+
+final class Version20260226210000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Reassign legacy INTERIM contract to a TIME 35h contract and remove legacy INTERIM contract row';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql(
+            <<<'SQL'
+                DO $$
+                DECLARE
+                    legacy_interim_contract_id INT;
+                    target_time_35h_contract_id INT;
+                BEGIN
+                    -- Contrat legacy "Intérim" (ancien modèle).
+                    SELECT c.id
+                    INTO legacy_interim_contract_id
+                    FROM contracts c
+                    WHERE LOWER(c.name) LIKE '%interim%'
+                    ORDER BY c.id
+                    LIMIT 1;
+
+                    -- Si déjà supprimé, on ne fait rien.
+                    IF legacy_interim_contract_id IS NULL THEN
+                        RETURN;
+                    END IF;
+
+                    -- Contrat cible: suivi horaire 35h.
+                    SELECT c.id
+                    INTO target_time_35h_contract_id
+                    FROM contracts c
+                    WHERE c.tracking_mode = 'TIME'
+                      AND c.weekly_hours = 35
+                      AND c.id <> legacy_interim_contract_id
+                    ORDER BY
+                        CASE WHEN LOWER(c.name) = '35h' THEN 0 ELSE 1 END,
+                        c.id
+                    LIMIT 1;
+
+                    IF target_time_35h_contract_id IS NULL THEN
+                        RAISE EXCEPTION 'No TIME 35h contract found to replace legacy INTERIM contract id=%', legacy_interim_contract_id;
+                    END IF;
+
+                    -- Ré-assigne l'historique de périodes.
+                    UPDATE employee_contract_periods
+                    SET contract_id = target_time_35h_contract_id
+                    WHERE contract_id = legacy_interim_contract_id;
+
+                    -- Ré-assigne le pointeur actuel employé (compat legacy / affichage).
+                    UPDATE employees
+                    SET contract_id = target_time_35h_contract_id
+                    WHERE contract_id = legacy_interim_contract_id;
+
+                    -- Garde-fou FK avant suppression.
+                    IF EXISTS (SELECT 1 FROM employee_contract_periods p WHERE p.contract_id = legacy_interim_contract_id)
+                       OR EXISTS (SELECT 1 FROM employees e WHERE e.contract_id = legacy_interim_contract_id) THEN
+                        RAISE EXCEPTION 'Legacy INTERIM contract id=% is still referenced', legacy_interim_contract_id;
+                    END IF;
+
+                    DELETE FROM contracts WHERE id = legacy_interim_contract_id;
+                END $$;
+                SQL
+        );
+    }
+
+    public function down(Schema $schema): void
+    {
+        throw new IrreversibleMigration('This migration performs data reassignment and contract deletion.');
+    }
+}
diff --git a/src/ApiResource/AbsencePrint.php b/src/ApiResource/AbsencePrint.php
index 97cdf93..8125843 100644
--- a/src/ApiResource/AbsencePrint.php
+++ b/src/ApiResource/AbsencePrint.php
@@ -18,6 +18,8 @@ use App\State\AbsencePrintProvider;
                 new QueryParameter(key: 'from', required: true),
                 new QueryParameter(key: 'to', required: true),
                 new QueryParameter(key: 'sites', required: false),
+                new QueryParameter(key: 'contractNatures', required: false),
+                new QueryParameter(key: 'workContracts', required: false),
             ],
             security: "is_granted('ROLE_ADMIN')"
         ),
diff --git a/src/ApiResource/WorkHourDayContext.php b/src/ApiResource/WorkHourDayContext.php
index f91c136..f035924 100644
--- a/src/ApiResource/WorkHourDayContext.php
+++ b/src/ApiResource/WorkHourDayContext.php
@@ -26,6 +26,7 @@ final class WorkHourDayContext
      * @var list<array{
      *     employeeId:int,
      *     absenceLabel:?string,
+     *     absenceColor:?string,
      *     absenceHalf:?string,
      *     absentMorning:bool,
      *     absentAfternoon:bool,
diff --git a/src/Dto/WorkHours/DayContextRow.php b/src/Dto/WorkHours/DayContextRow.php
index a19595a..83aac89 100644
--- a/src/Dto/WorkHours/DayContextRow.php
+++ b/src/Dto/WorkHours/DayContextRow.php
@@ -10,6 +10,7 @@ final class DayContextRow
         public int $employeeId,
         public bool $hasContractAtDate = true,
         public ?string $absenceLabel = null,
+        public ?string $absenceColor = null,
         public ?string $absenceHalf = null,
         public bool $absentMorning = false,
         public bool $absentAfternoon = false,
@@ -19,6 +20,7 @@ final class DayContextRow
 
     public function addAbsence(
         ?string $label,
+        ?string $color,
         bool $morning,
         bool $afternoon,
         int $creditedMinutes,
@@ -35,6 +37,14 @@ final class DayContextRow
             $this->absenceLabel = 'Absences multiples';
         }
 
+        // Si plusieurs types d'absence différents sont fusionnés sur la même journée,
+        // on retire la couleur métier spécifique.
+        if (null === $this->absenceColor) {
+            $this->absenceColor = $color;
+        } elseif ($color !== $this->absenceColor) {
+            $this->absenceColor = null;
+        }
+
         // AM/PM seulement pour les demi-journées, null pour journée complète.
         $this->absenceHalf = $this->resolveHalfLabel($this->absentMorning, $this->absentAfternoon);
         // Cumule les minutes créditées par les absences "comptées comme travaillées".
@@ -48,6 +58,7 @@ final class DayContextRow
      *     employeeId:int,
      *     hasContractAtDate:bool,
      *     absenceLabel:?string,
+     *     absenceColor:?string,
      *     absenceHalf:?string,
      *     absentMorning:bool,
      *     absentAfternoon:bool,
@@ -61,6 +72,7 @@ final class DayContextRow
             'employeeId'            => $this->employeeId,
             'hasContractAtDate'     => $this->hasContractAtDate,
             'absenceLabel'          => $this->absenceLabel,
+            'absenceColor'          => $this->absenceColor,
             'absenceHalf'           => $this->absenceHalf,
             'absentMorning'         => $this->absentMorning,
             'absentAfternoon'       => $this->absentAfternoon,
diff --git a/src/Entity/Employee.php b/src/Entity/Employee.php
index 9d35561..92aaa15 100644
--- a/src/Entity/Employee.php
+++ b/src/Entity/Employee.php
@@ -6,9 +6,12 @@ namespace App\Entity;
 
 use ApiPlatform\Metadata\ApiProperty;
 use ApiPlatform\Metadata\ApiResource;
+use App\Enum\ContractNature;
 use App\Repository\EmployeeRepository;
 use App\State\EmployeeWriteProcessor;
 use DateTimeImmutable;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Serializer\Attribute\Groups;
 
@@ -56,9 +59,25 @@ class Employee
     #[ORM\Column(type: 'datetime_immutable')]
     private DateTimeImmutable $createdAt;
 
+    /**
+     * @var Collection<int, EmployeeContractPeriod>
+     */
+    #[ORM\OneToMany(mappedBy: 'employee', targetEntity: EmployeeContractPeriod::class)]
+    private Collection $contractPeriods;
+
+    #[Groups(['employee:write'])]
+    private ?string $contractNature = null;
+
+    #[Groups(['employee:write'])]
+    private ?string $contractStartDate = null;
+
+    #[Groups(['employee:write'])]
+    private ?string $contractEndDate = null;
+
     public function __construct()
     {
-        $this->createdAt = new DateTimeImmutable();
+        $this->createdAt       = new DateTimeImmutable();
+        $this->contractPeriods = new ArrayCollection();
     }
 
     public function getId(): ?int
@@ -130,4 +149,81 @@ class Employee
 
         return $this;
     }
+
+    public function getContractNature(): ?string
+    {
+        return $this->contractNature;
+    }
+
+    public function setContractNature(?string $contractNature): self
+    {
+        $this->contractNature = $contractNature;
+
+        return $this;
+    }
+
+    public function getContractStartDate(): ?string
+    {
+        return $this->contractStartDate;
+    }
+
+    public function setContractStartDate(?string $contractStartDate): self
+    {
+        $this->contractStartDate = $contractStartDate;
+
+        return $this;
+    }
+
+    public function getContractEndDate(): ?string
+    {
+        return $this->contractEndDate;
+    }
+
+    public function setContractEndDate(?string $contractEndDate): self
+    {
+        $this->contractEndDate = $contractEndDate;
+
+        return $this;
+    }
+
+    #[Groups(['employee:read'])]
+    public function getCurrentContractNature(): string
+    {
+        return $this->resolveCurrentContractPeriod()?->getContractNatureEnum()->value ?? ContractNature::CDI->value;
+    }
+
+    #[Groups(['employee:read'])]
+    public function getCurrentContractStartDate(): ?string
+    {
+        return $this->resolveCurrentContractPeriod()?->getStartDate()->format('Y-m-d');
+    }
+
+    #[Groups(['employee:read'])]
+    public function getCurrentContractEndDate(): ?string
+    {
+        return $this->resolveCurrentContractPeriod()?->getEndDate()?->format('Y-m-d');
+    }
+
+    private function resolveCurrentContractPeriod(): ?EmployeeContractPeriod
+    {
+        $today   = new DateTimeImmutable('today');
+        $current = null;
+
+        foreach ($this->contractPeriods as $period) {
+            if ($period->getStartDate() > $today) {
+                continue;
+            }
+
+            $endDate = $period->getEndDate();
+            if (null !== $endDate && $endDate < $today) {
+                continue;
+            }
+
+            if (null === $current || $period->getStartDate() > $current->getStartDate()) {
+                $current = $period;
+            }
+        }
+
+        return $current;
+    }
 }
diff --git a/src/Entity/EmployeeContractPeriod.php b/src/Entity/EmployeeContractPeriod.php
index 67720ee..9cb276c 100644
--- a/src/Entity/EmployeeContractPeriod.php
+++ b/src/Entity/EmployeeContractPeriod.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Entity;
 
+use App\Enum\ContractNature;
 use App\Repository\EmployeeContractPeriodRepository;
 use DateTimeImmutable;
 use Doctrine\ORM\Mapping as ORM;
@@ -19,7 +20,7 @@ class EmployeeContractPeriod
     #[ORM\Column(type: 'integer')]
     private ?int $id = null;
 
-    #[ORM\ManyToOne(targetEntity: Employee::class)]
+    #[ORM\ManyToOne(targetEntity: Employee::class, inversedBy: 'contractPeriods')]
     #[ORM\JoinColumn(nullable: false, onDelete: 'CASCADE')]
     private ?Employee $employee = null;
 
@@ -33,6 +34,9 @@ class EmployeeContractPeriod
     #[ORM\Column(type: 'date_immutable', nullable: true)]
     private ?DateTimeImmutable $endDate = null;
 
+    #[ORM\Column(type: 'string', length: 20, options: ['default' => ContractNature::CDI->value])]
+    private string $contractNature = ContractNature::CDI->value;
+
     #[ORM\Column(type: 'datetime_immutable')]
     private DateTimeImmutable $createdAt;
 
@@ -95,6 +99,24 @@ class EmployeeContractPeriod
         return $this;
     }
 
+    public function getContractNature(): string
+    {
+        return $this->contractNature;
+    }
+
+    public function getContractNatureEnum(): ContractNature
+    {
+        return ContractNature::tryFrom($this->contractNature) ?? ContractNature::CDI;
+    }
+
+    public function setContractNature(ContractNature|string $contractNature): self
+    {
+        $value                = $contractNature instanceof ContractNature ? $contractNature->value : $contractNature;
+        $this->contractNature = ContractNature::tryFrom($value)?->value ?? ContractNature::CDI->value;
+
+        return $this;
+    }
+
     public function getCreatedAt(): DateTimeImmutable
     {
         return $this->createdAt;
diff --git a/src/Enum/ContractNature.php b/src/Enum/ContractNature.php
new file mode 100644
index 0000000..f471600
--- /dev/null
+++ b/src/Enum/ContractNature.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enum;
+
+enum ContractNature: string
+{
+    case CDI     = 'CDI';
+    case CDD     = 'CDD';
+    case INTERIM = 'INTERIM';
+
+    public function requiresEndDate(): bool
+    {
+        return self::CDD === $this || self::INTERIM === $this;
+    }
+}
diff --git a/src/Repository/EmployeeRepository.php b/src/Repository/EmployeeRepository.php
index dd085ab..62f5382 100644
--- a/src/Repository/EmployeeRepository.php
+++ b/src/Repository/EmployeeRepository.php
@@ -85,6 +85,8 @@ final class EmployeeRepository extends ServiceEntityRepository implements Employ
         $qb = $this->createQueryBuilder('e')
             ->leftJoin('e.site', 's')
             ->addSelect('s')
+            ->leftJoin('e.contract', 'c')
+            ->addSelect('c')
             ->orderBy('s.displayOrder', 'ASC')
             ->addOrderBy('s.name', 'ASC')
             ->addOrderBy('e.displayOrder', 'ASC')
diff --git a/src/Service/Contracts/EmployeeContractResolver.php b/src/Service/Contracts/EmployeeContractResolver.php
index be2c4fb..88950d6 100644
--- a/src/Service/Contracts/EmployeeContractResolver.php
+++ b/src/Service/Contracts/EmployeeContractResolver.php
@@ -6,6 +6,7 @@ namespace App\Service\Contracts;
 
 use App\Entity\Contract;
 use App\Entity\Employee;
+use App\Enum\ContractNature;
 use App\Repository\EmployeeContractPeriodRepository;
 use DateTimeImmutable;
 
@@ -22,6 +23,13 @@ readonly class EmployeeContractResolver
         return $period?->getContract();
     }
 
+    public function resolveNatureForEmployeeAndDate(Employee $employee, DateTimeImmutable $date): ContractNature
+    {
+        $period = $this->periodRepository->findOneCoveringDate($employee, $date);
+
+        return $period?->getContractNatureEnum() ?? ContractNature::CDI;
+    }
+
     /**
      * @param list<Employee> $employees
      * @param list<string>   $days
@@ -68,4 +76,51 @@ readonly class EmployeeContractResolver
 
         return $resolved;
     }
+
+    /**
+     * @param list<Employee> $employees
+     * @param list<string>   $days
+     *
+     * @return array<int, array<string, ContractNature>>
+     */
+    public function resolveNaturesForEmployeesAndDays(array $employees, array $days): array
+    {
+        $resolved = [];
+        if ([] === $employees || [] === $days) {
+            return $resolved;
+        }
+
+        foreach ($employees as $employee) {
+            $employeeId = $employee->getId();
+            if (!$employeeId) {
+                continue;
+            }
+
+            foreach ($days as $day) {
+                $resolved[$employeeId][$day] = ContractNature::CDI;
+            }
+        }
+
+        $from    = new DateTimeImmutable(min($days));
+        $to      = new DateTimeImmutable(max($days));
+        $periods = $this->periodRepository->findByEmployeesAndDateRange($employees, $from, $to);
+        foreach ($periods as $period) {
+            $employeeId = $period->getEmployee()?->getId();
+            if (!$employeeId) {
+                continue;
+            }
+
+            $start  = $period->getStartDate()->format('Y-m-d');
+            $end    = $period->getEndDate()?->format('Y-m-d') ?? '9999-12-31';
+            $nature = $period->getContractNatureEnum();
+            foreach ($days as $day) {
+                if ($day < $start || $day > $end) {
+                    continue;
+                }
+                $resolved[$employeeId][$day] = $nature;
+            }
+        }
+
+        return $resolved;
+    }
 }
diff --git a/src/State/AbsencePrintProvider.php b/src/State/AbsencePrintProvider.php
index d570419..e2ca32d 100644
--- a/src/State/AbsencePrintProvider.php
+++ b/src/State/AbsencePrintProvider.php
@@ -6,6 +6,7 @@ namespace App\State;
 
 use ApiPlatform\Metadata\Operation;
 use ApiPlatform\State\ProviderInterface;
+use App\Enum\ContractNature;
 use App\Enum\HalfDay;
 use App\Repository\AbsenceRepository;
 use App\Repository\EmployeeRepository;
@@ -53,9 +54,11 @@ class AbsencePrintProvider implements ProviderInterface
         $fromDate = DateTimeImmutable::createFromFormat('Y-m-d', $from);
         $toDate   = DateTimeImmutable::createFromFormat('Y-m-d', $to);
 
-        $siteIds = $this->parseIds($request->query->get('sites'));
+        $siteIds         = $this->parseIds($request->query->get('sites'));
+        $workContractIds = $this->parseIds($request->query->get('workContracts'));
+        $contractNatures = $this->parseContractNatures($request->query->get('contractNatures'));
 
-        $employees = $this->loadEmployees($siteIds);
+        $employees = $this->loadEmployees($siteIds, $contractNatures, $workContractIds);
         $absences  = $this->loadAbsences($fromDate, $toDate, $employees);
 
         $days       = $this->buildDays($fromDate, $toDate);
@@ -108,9 +111,19 @@ class AbsencePrintProvider implements ProviderInterface
         return array_values(array_unique($ids));
     }
 
-    private function loadEmployees(array $siteIds): array
+    private function loadEmployees(array $siteIds, array $contractNatures, array $workContractIds): array
     {
-        return $this->employeeRepository->findForPrintBySiteIds($siteIds);
+        $employees = $this->employeeRepository->findForPrintBySiteIds($siteIds);
+
+        return array_values(array_filter($employees, static function ($employee) use ($contractNatures, $workContractIds): bool {
+            $employeeNature     = (string) $employee->getCurrentContractNature();
+            $employeeContractId = $employee->getContract()?->getId();
+
+            $natureMatches   = [] === $contractNatures || in_array($employeeNature, $contractNatures, true);
+            $contractMatches = [] === $workContractIds || (null !== $employeeContractId && in_array($employeeContractId, $workContractIds, true));
+
+            return $natureMatches && $contractMatches;
+        }));
     }
 
     private function loadAbsences(DateTimeImmutable $from, DateTimeImmutable $to, array $employees): array
@@ -209,4 +222,24 @@ class AbsencePrintProvider implements ProviderInterface
 
         return $map;
     }
+
+    /**
+     * @return list<string>
+     */
+    private function parseContractNatures(?string $value): array
+    {
+        if (null === $value || '' === trim($value)) {
+            return [];
+        }
+
+        $values = [];
+        foreach (explode(',', $value) as $part) {
+            $nature = strtoupper(trim($part));
+            if (null !== ContractNature::tryFrom($nature)) {
+                $values[] = $nature;
+            }
+        }
+
+        return array_values(array_unique($values));
+    }
 }
diff --git a/src/State/EmployeeWriteProcessor.php b/src/State/EmployeeWriteProcessor.php
index ed4f58c..1d27a18 100644
--- a/src/State/EmployeeWriteProcessor.php
+++ b/src/State/EmployeeWriteProcessor.php
@@ -10,10 +10,12 @@ use ApiPlatform\State\ProcessorInterface;
 use App\Entity\Contract;
 use App\Entity\Employee;
 use App\Entity\EmployeeContractPeriod;
+use App\Enum\ContractNature;
 use App\Repository\EmployeeContractPeriodRepository;
 use DateTimeImmutable;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
 
 final readonly class EmployeeWriteProcessor implements ProcessorInterface
 {
@@ -49,27 +51,46 @@ final readonly class EmployeeWriteProcessor implements ProcessorInterface
             return $result;
         }
 
-        $today = new DateTimeImmutable('today');
+        $today                   = new DateTimeImmutable('today');
+        $requestedContractNature = $this->resolveContractNature($data->getContractNature());
+        $requestedStartDate      = $this->parseOptionalYmd($data->getContractStartDate(), 'contractStartDate');
+        $requestedEndDate        = $this->parseOptionalYmd($data->getContractEndDate(), 'contractEndDate');
+
         if ($isNew) {
-            $this->ensureContractPeriodExists($data, $currentContract, new DateTimeImmutable('1970-01-01'));
+            $startDate = $requestedStartDate ?? new DateTimeImmutable('1970-01-01');
+            $nature    = $requestedContractNature ?? ContractNature::CDI;
+            $this->assertPeriodDates($startDate, $requestedEndDate, $nature);
+            $this->ensureContractPeriodExists($data, $currentContract, $startDate, $requestedEndDate, $nature);
 
             return $result;
         }
 
-        if ($this->isSameContract($previousContract, $currentContract)) {
+        $hasPeriodChangeRequest = null !== $requestedContractNature || null !== $requestedStartDate || null !== $requestedEndDate;
+        if ($this->isSameContract($previousContract, $currentContract) && !$hasPeriodChangeRequest) {
             return $result;
         }
 
+        $startDate   = $requestedStartDate ?? $today;
         $todayPeriod = $this->periodRepository->findOneCoveringDate($data, $today);
-        if (null !== $todayPeriod && null === $todayPeriod->getEndDate() && $todayPeriod->getStartDate()->format('Y-m-d') === $today->format('Y-m-d')) {
+        $nature      = $requestedContractNature ?? $todayPeriod?->getContractNatureEnum() ?? ContractNature::CDI;
+        $endDate     = $requestedEndDate;
+        $this->assertPeriodDates($startDate, $endDate, $nature);
+
+        if (
+            null !== $todayPeriod
+            && null === $todayPeriod->getEndDate()
+            && $todayPeriod->getStartDate()->format('Y-m-d') === $startDate->format('Y-m-d')
+        ) {
             $todayPeriod->setContract($currentContract);
+            $todayPeriod->setContractNature($nature);
+            $todayPeriod->setEndDate($endDate);
             $this->entityManager->flush();
 
             return $result;
         }
 
-        $this->periodRepository->closeOpenPeriods($data, $today->modify('-1 day'));
-        $this->createPeriod($data, $currentContract, $today);
+        $this->periodRepository->closeOpenPeriods($data, $startDate->modify('-1 day'));
+        $this->createPeriod($data, $currentContract, $startDate, $endDate, $nature);
         $this->entityManager->flush();
 
         return $result;
@@ -96,26 +117,80 @@ final readonly class EmployeeWriteProcessor implements ProcessorInterface
         return $first->getId() === $second->getId();
     }
 
-    private function ensureContractPeriodExists(Employee $employee, Contract $contract, DateTimeImmutable $startDate): void
-    {
+    private function ensureContractPeriodExists(
+        Employee $employee,
+        Contract $contract,
+        DateTimeImmutable $startDate,
+        ?DateTimeImmutable $endDate,
+        ContractNature $nature,
+    ): void {
         $covered = $this->periodRepository->findOneCoveringDate($employee, $startDate);
         if (null !== $covered) {
             return;
         }
 
-        $this->createPeriod($employee, $contract, $startDate);
+        $this->createPeriod($employee, $contract, $startDate, $endDate, $nature);
         $this->entityManager->flush();
     }
 
-    private function createPeriod(Employee $employee, Contract $contract, DateTimeImmutable $startDate): void
-    {
+    private function createPeriod(
+        Employee $employee,
+        Contract $contract,
+        DateTimeImmutable $startDate,
+        ?DateTimeImmutable $endDate,
+        ContractNature $nature,
+    ): void {
         $period = new EmployeeContractPeriod()
             ->setEmployee($employee)
             ->setContract($contract)
             ->setStartDate($startDate)
-            ->setEndDate(null)
+            ->setEndDate($endDate)
+            ->setContractNature($nature)
         ;
 
         $this->entityManager->persist($period);
     }
+
+    private function resolveContractNature(?string $raw): ?ContractNature
+    {
+        if (null === $raw || '' === trim($raw)) {
+            return null;
+        }
+
+        return ContractNature::tryFrom(trim($raw))
+            ?? throw new UnprocessableEntityHttpException('contractNature must be one of CDI, CDD, INTERIM.');
+    }
+
+    private function parseOptionalYmd(?string $raw, string $field): ?DateTimeImmutable
+    {
+        if (null === $raw || '' === trim($raw)) {
+            return null;
+        }
+
+        $value = trim($raw);
+        $date  = DateTimeImmutable::createFromFormat('Y-m-d', $value);
+        if (!$date || $date->format('Y-m-d') !== $value) {
+            throw new UnprocessableEntityHttpException(sprintf('%s must use Y-m-d format.', $field));
+        }
+
+        return $date;
+    }
+
+    private function assertPeriodDates(
+        DateTimeImmutable $startDate,
+        ?DateTimeImmutable $endDate,
+        ContractNature $nature
+    ): void {
+        if (null !== $endDate && $endDate < $startDate) {
+            throw new UnprocessableEntityHttpException('contractEndDate cannot be before contractStartDate.');
+        }
+
+        if ($nature->requiresEndDate() && null === $endDate) {
+            throw new UnprocessableEntityHttpException('contractEndDate is required for CDD and INTERIM.');
+        }
+
+        if (ContractNature::CDI === $nature && null !== $endDate) {
+            throw new UnprocessableEntityHttpException('contractEndDate must be empty for CDI.');
+        }
+    }
 }
diff --git a/src/State/WorkHourDayContextProvider.php b/src/State/WorkHourDayContextProvider.php
index 7ae51ed..52ccc57 100644
--- a/src/State/WorkHourDayContextProvider.php
+++ b/src/State/WorkHourDayContextProvider.php
@@ -77,6 +77,7 @@ final readonly class WorkHourDayContextProvider implements ProviderInterface
             $creditedPresenceUnits = $this->workedHoursCreditPolicy->computeCreditedPresenceUnits($absence, $dateKey, $absentMorning, $absentAfternoon);
             $rowsByEmployeeId[$employeeId]->addAbsence(
                 label: $absence->getType()?->getLabel(),
+                color: $absence->getType()?->getColor(),
                 morning: $absentMorning,
                 afternoon: $absentAfternoon,
                 creditedMinutes: $creditedMinutes,
diff --git a/src/State/WorkHourWeeklySummaryProvider.php b/src/State/WorkHourWeeklySummaryProvider.php
index be40207..b11922b 100644
--- a/src/State/WorkHourWeeklySummaryProvider.php
+++ b/src/State/WorkHourWeeklySummaryProvider.php
@@ -15,6 +15,7 @@ use App\Entity\Contract;
 use App\Entity\Employee;
 use App\Entity\User;
 use App\Entity\WorkHour;
+use App\Enum\ContractNature;
 use App\Enum\ContractType;
 use App\Enum\TrackingMode;
 use App\Repository\Contract\AbsenceReadRepositoryInterface;
@@ -113,8 +114,9 @@ final readonly class WorkHourWeeklySummaryProvider implements ProviderInterface
      */
     private function buildRows(array $employees, array $workHours, array $absences, array $days, string $anchorDateYmd): array
     {
-        $contractsByEmployeeDate = $this->contractResolver->resolveForEmployeesAndDays($employees, $days);
-        $metricsByEmployeeDate   = [];
+        $contractsByEmployeeDate       = $this->contractResolver->resolveForEmployeesAndDays($employees, $days);
+        $contractNaturesByEmployeeDate = $this->contractResolver->resolveNaturesForEmployeesAndDays($employees, $days);
+        $metricsByEmployeeDate         = [];
         foreach ($workHours as $workHour) {
             $employeeId = $workHour->getEmployee()?->getId();
             if (!$employeeId) {
@@ -182,6 +184,9 @@ final readonly class WorkHourWeeklySummaryProvider implements ProviderInterface
             $weekAnchorContract = $contractsByEmployeeDate[$employeeId][$anchorDateYmd]
                 ?? $contractsByEmployeeDate[$employeeId][$days[0]]
                 ?? null;
+            $weekAnchorContractNature = $contractNaturesByEmployeeDate[$employeeId][$anchorDateYmd]
+                ?? $contractNaturesByEmployeeDate[$employeeId][$days[0]]
+                ?? ContractNature::CDI;
             $employeeContractsByDate = [];
             foreach ($days as $date) {
                 $employeeContractsByDate[$date] = $contractsByEmployeeDate[$employeeId][$date] ?? null;
@@ -223,7 +228,7 @@ final readonly class WorkHourWeeklySummaryProvider implements ProviderInterface
             }
 
             $isWeekPresenceTracking     = TrackingMode::PRESENCE->value === $weekAnchorContract?->getTrackingMode();
-            $disableOvertimeBonuses     = $this->hasDisabledOvertimeBonuses($weekAnchorContract);
+            $disableOvertimeBonuses     = $this->hasDisabledOvertimeBonuses($weekAnchorContract, $weekAnchorContractNature);
             $overtimeReferenceMinutes   = $this->computeWeeklyOvertimeReferenceMinutes($days, $employeeContractsByDate);
             $overtime25StartMinutes     = $this->computeWeeklyOvertime25StartMinutes($days, $employeeContractsByDate);
             $weeklyOvertimeTotalMinutes = $isWeekPresenceTracking
@@ -407,8 +412,12 @@ final readonly class WorkHourWeeklySummaryProvider implements ProviderInterface
         return (int) round($trancheMinutes * 0.5);
     }
 
-    private function hasDisabledOvertimeBonuses(?Contract $contract): bool
+    private function hasDisabledOvertimeBonuses(?Contract $contract, ContractNature $contractNature): bool
     {
+        if (ContractNature::INTERIM === $contractNature) {
+            return true;
+        }
+
         $type = ContractType::resolve(
             $contract?->getName(),
             $contract?->getTrackingMode(),