diff --git a/frontend/components/project/ProjectDrawer.vue b/frontend/components/project/ProjectDrawer.vue
index 868e21a..170f747 100644
--- a/frontend/components/project/ProjectDrawer.vue
+++ b/frontend/components/project/ProjectDrawer.vue
@@ -1,6 +1,15 @@
 <template>
     <AppDrawer v-model="isOpen" :title="isEditing ? 'Modifier un projet' : 'Ajouter un projet'">
         <form @submit.prevent="handleSubmit" class="flex flex-col gap-2">
+            <MalioInputText
+                v-model="form.code"
+                label="Code"
+                input-class="w-full uppercase"
+                :disabled="isEditing"
+                :error="touched.code && !form.code.trim() ? 'Le code est requis' : touched.code && !/^[A-Z]{2,10}$/.test(form.code.trim()) ? '2 à 10 lettres majuscules' : ''"
+                @blur="touched.code = true"
+                @input="form.code = form.code.toUpperCase().replace(/[^A-Z]/g, '')"
+            />
             <MalioInputText
                 v-model="form.name"
                 label="Titre"
@@ -62,6 +71,7 @@ const isEditing = computed(() => !!props.project)
 const isSubmitting = ref(false)
 
 const form = reactive({
+    code: '',
     name: '',
     description: '',
     color: '#222783',
@@ -69,6 +79,7 @@ const form = reactive({
 })
 
 const touched = reactive({
+    code: false,
     name: false,
 })
 
@@ -79,16 +90,19 @@ const clientOptions = computed(() =>
 watch(() => props.modelValue, (open) => {
     if (open) {
         if (props.project) {
+            form.code = props.project.code ?? ''
             form.name = props.project.name ?? ''
             form.description = props.project.description ?? ''
             form.color = props.project.color ?? '#222783'
             form.clientId = props.project.client?.id ?? null
         } else {
+            form.code = ''
             form.name = ''
             form.description = ''
             form.color = '#222783'
             form.clientId = null
         }
+        touched.code = false
         touched.name = false
     }
 })
@@ -97,7 +111,9 @@ const { create, update } = useProjectService()
 
 async function handleSubmit() {
     touched.name = true
+    touched.code = true
     if (!form.name.trim()) return
+    if (!isEditing.value && (!form.code.trim() || !/^[A-Z]{2,10}$/.test(form.code.trim()))) return
 
     isSubmitting.value = true
     try {
@@ -111,6 +127,7 @@ async function handleSubmit() {
         if (isEditing.value && props.project) {
             await update(props.project.id, payload)
         } else {
+            payload.code = form.code.trim()
             await create(payload)
         }
 
diff --git a/frontend/services/dto/project.ts b/frontend/services/dto/project.ts
index 06d0255..e8e7766 100644
--- a/frontend/services/dto/project.ts
+++ b/frontend/services/dto/project.ts
@@ -3,6 +3,7 @@ import type { Client } from './client'
 export type Project = {
     id: number
     '@id'?: string
+    code: string
     name: string
     description: string | null
     color: string
@@ -10,6 +11,7 @@ export type Project = {
 }
 
 export type ProjectWrite = {
+    code?: string
     name: string
     description: string | null
     color: string
diff --git a/src/Entity/Project.php b/src/Entity/Project.php
index dd2eaa9..109d876 100644
--- a/src/Entity/Project.php
+++ b/src/Entity/Project.php
@@ -12,13 +12,18 @@ use ApiPlatform\Metadata\Patch;
 use ApiPlatform\Metadata\Post;
 use App\Repository\ProjectRepository;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Component\Serializer\Attribute\Groups;
+use Symfony\Component\Validator\Constraints as Assert;
 
 #[ApiResource(
     operations: [
         new GetCollection(),
         new Get(),
-        new Post(security: "is_granted('ROLE_ADMIN')"),
+        new Post(
+            security: "is_granted('ROLE_ADMIN')",
+            denormalizationContext: ['groups' => ['project:write', 'project:create']],
+        ),
         new Patch(security: "is_granted('ROLE_ADMIN')"),
         new Delete(security: "is_granted('ROLE_ADMIN')"),
     ],
@@ -27,6 +32,7 @@ use Symfony\Component\Serializer\Attribute\Groups;
     order: ['name' => 'ASC'],
 )]
 #[ORM\Entity(repositoryClass: ProjectRepository::class)]
+#[UniqueEntity(fields: ['code'], message: 'Ce code de projet est déjà utilisé.')]
 class Project
 {
     #[ORM\Id]
@@ -35,6 +41,12 @@ class Project
     #[Groups(['project:read', 'time_entry:read'])]
     private ?int $id = null;
 
+    #[ORM\Column(length: 10, unique: true)]
+    #[Groups(['project:read', 'project:create', 'task:read'])]
+    #[Assert\NotBlank]
+    #[Assert\Regex(pattern: '/^[A-Z]{2,10}$/', message: 'Le code doit contenir entre 2 et 10 lettres majuscules.')]
+    private ?string $code = null;
+
     #[ORM\Column(length: 255)]
     #[Groups(['project:read', 'project:write', 'time_entry:read'])]
     private ?string $name = null;
@@ -57,6 +69,18 @@ class Project
         return $this->id;
     }
 
+    public function getCode(): ?string
+    {
+        return $this->code;
+    }
+
+    public function setCode(string $code): static
+    {
+        $this->code = $code;
+
+        return $this;
+    }
+
     public function getName(): ?string
     {
         return $this->name;
diff --git a/src/Repository/TaskRepository.php b/src/Repository/TaskRepository.php
index 3e51abc..342c025 100644
--- a/src/Repository/TaskRepository.php
+++ b/src/Repository/TaskRepository.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Repository;
 
+use App\Entity\Project;
 use App\Entity\Task;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
@@ -14,4 +15,17 @@ class TaskRepository extends ServiceEntityRepository
     {
         parent::__construct($registry, Task::class);
     }
+
+    public function findMaxNumberByProject(Project $project): int
+    {
+        $result = $this->createQueryBuilder('t')
+            ->select('MAX(t.number)')
+            ->where('t.project = :project')
+            ->setParameter('project', $project)
+            ->getQuery()
+            ->getSingleScalarResult()
+        ;
+
+        return (int) ($result ?? 0);
+    }
 }
diff --git a/src/State/TaskNumberProcessor.php b/src/State/TaskNumberProcessor.php
new file mode 100644
index 0000000..480a36f
--- /dev/null
+++ b/src/State/TaskNumberProcessor.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\State\ProcessorInterface;
+use App\Entity\Task;
+use App\Repository\TaskRepository;
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+/**
+ * @implements ProcessorInterface<Task, Task>
+ */
+final readonly class TaskNumberProcessor implements ProcessorInterface
+{
+    /**
+     * @param ProcessorInterface<Task, Task> $persistProcessor
+     */
+    public function __construct(
+        #[Autowire(service: 'api_platform.doctrine.orm.state.persist_processor')]
+        private ProcessorInterface $persistProcessor,
+        private TaskRepository $taskRepository,
+    ) {}
+
+    /**
+     * @param Task $data
+     */
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): mixed
+    {
+        if ($operation instanceof Post && null !== $data->getProject()) {
+            $maxNumber = $this->taskRepository->findMaxNumberByProject($data->getProject());
+            $data->setNumber($maxNumber + 1);
+        }
+
+        return $this->persistProcessor->process($data, $operation, $uriVariables, $context);
+    }
+}