diff --git a/config/packages/doctrine.yaml b/config/packages/doctrine.yaml
index 6c57caf..303521a 100644
--- a/config/packages/doctrine.yaml
+++ b/config/packages/doctrine.yaml
@@ -13,6 +13,8 @@ doctrine:
         identity_generation_preferences:
             Doctrine\DBAL\Platforms\PostgreSQLPlatform: identity
         auto_mapping: true
+        resolve_target_entities:
+            App\Shared\Domain\Contract\UserInterface: App\Entity\User
         mappings:
             App:
                 type: attribute
diff --git a/src/Entity/User.php b/src/Entity/User.php
index 2bc49c9..38e789e 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -13,6 +13,7 @@ use ApiPlatform\Metadata\Patch;
 use ApiPlatform\Metadata\Post;
 use App\Enum\ContractType;
 use App\Repository\UserRepository;
+use App\Shared\Domain\Contract\UserInterface as SharedUserInterface;
 use App\State\MeProvider;
 use App\State\UserPasswordHasherProcessor;
 use DateTimeImmutable;
@@ -44,7 +45,7 @@ use Symfony\Component\Serializer\Attribute\Groups;
 )]
 #[ORM\Entity(repositoryClass: UserRepository::class)]
 #[ORM\Table(name: '`user`')]
-class User implements UserInterface, PasswordAuthenticatedUserInterface
+class User implements UserInterface, PasswordAuthenticatedUserInterface, SharedUserInterface
 {
     #[ORM\Id]
     #[ORM\GeneratedValue]
diff --git a/src/Shared/Application/CurrentUserProviderInterface.php b/src/Shared/Application/CurrentUserProviderInterface.php
new file mode 100644
index 0000000..da670e2
--- /dev/null
+++ b/src/Shared/Application/CurrentUserProviderInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Application;
+
+use App\Shared\Domain\Contract\UserInterface;
+
+interface CurrentUserProviderInterface
+{
+    public function getCurrentUser(): ?UserInterface;
+}
diff --git a/src/Shared/Domain/Contract/BlamableInterface.php b/src/Shared/Domain/Contract/BlamableInterface.php
new file mode 100644
index 0000000..8063312
--- /dev/null
+++ b/src/Shared/Domain/Contract/BlamableInterface.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Contract;
+
+interface BlamableInterface
+{
+    public function getCreatedBy(): ?UserInterface;
+
+    public function setCreatedBy(?UserInterface $user): void;
+
+    public function getUpdatedBy(): ?UserInterface;
+
+    public function setUpdatedBy(?UserInterface $user): void;
+}
diff --git a/src/Shared/Domain/Contract/TimestampableInterface.php b/src/Shared/Domain/Contract/TimestampableInterface.php
new file mode 100644
index 0000000..2a272ac
--- /dev/null
+++ b/src/Shared/Domain/Contract/TimestampableInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Contract;
+
+use DateTimeImmutable;
+
+interface TimestampableInterface
+{
+    public function getCreatedAt(): ?DateTimeImmutable;
+
+    public function setCreatedAt(DateTimeImmutable $createdAt): void;
+
+    public function getUpdatedAt(): ?DateTimeImmutable;
+
+    public function setUpdatedAt(DateTimeImmutable $updatedAt): void;
+}
diff --git a/src/Shared/Domain/Contract/UserInterface.php b/src/Shared/Domain/Contract/UserInterface.php
new file mode 100644
index 0000000..9879371
--- /dev/null
+++ b/src/Shared/Domain/Contract/UserInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Contract;
+
+interface UserInterface
+{
+    public function getId(): ?int;
+}
diff --git a/src/Shared/Domain/Trait/TimestampableBlamableTrait.php b/src/Shared/Domain/Trait/TimestampableBlamableTrait.php
new file mode 100644
index 0000000..41a421b
--- /dev/null
+++ b/src/Shared/Domain/Trait/TimestampableBlamableTrait.php
@@ -0,0 +1,71 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Domain\Trait;
+
+use App\Shared\Domain\Contract\UserInterface;
+use DateTimeImmutable;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+trait TimestampableBlamableTrait
+{
+    #[ORM\Column(name: 'created_at', type: 'datetime_immutable', nullable: true)]
+    #[Groups(['timestampable:read'])]
+    private ?DateTimeImmutable $createdAt = null;
+
+    #[ORM\Column(name: 'updated_at', type: 'datetime_immutable', nullable: true)]
+    #[Groups(['timestampable:read'])]
+    private ?DateTimeImmutable $updatedAt = null;
+
+    #[ORM\ManyToOne(targetEntity: UserInterface::class)]
+    #[ORM\JoinColumn(name: 'created_by', referencedColumnName: 'id', nullable: true, onDelete: 'SET NULL')]
+    #[Groups(['blamable:read'])]
+    private ?UserInterface $createdBy = null;
+
+    #[ORM\ManyToOne(targetEntity: UserInterface::class)]
+    #[ORM\JoinColumn(name: 'updated_by', referencedColumnName: 'id', nullable: true, onDelete: 'SET NULL')]
+    #[Groups(['blamable:read'])]
+    private ?UserInterface $updatedBy = null;
+
+    public function getCreatedAt(): ?DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function setCreatedAt(DateTimeImmutable $createdAt): void
+    {
+        $this->createdAt = $createdAt;
+    }
+
+    public function getUpdatedAt(): ?DateTimeImmutable
+    {
+        return $this->updatedAt;
+    }
+
+    public function setUpdatedAt(DateTimeImmutable $updatedAt): void
+    {
+        $this->updatedAt = $updatedAt;
+    }
+
+    public function getCreatedBy(): ?UserInterface
+    {
+        return $this->createdBy;
+    }
+
+    public function setCreatedBy(?UserInterface $user): void
+    {
+        $this->createdBy = $user;
+    }
+
+    public function getUpdatedBy(): ?UserInterface
+    {
+        return $this->updatedBy;
+    }
+
+    public function setUpdatedBy(?UserInterface $user): void
+    {
+        $this->updatedBy = $user;
+    }
+}
diff --git a/src/Shared/Infrastructure/Doctrine/TimestampableBlamableSubscriber.php b/src/Shared/Infrastructure/Doctrine/TimestampableBlamableSubscriber.php
new file mode 100644
index 0000000..2aa832a
--- /dev/null
+++ b/src/Shared/Infrastructure/Doctrine/TimestampableBlamableSubscriber.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Infrastructure\Doctrine;
+
+use App\Shared\Application\CurrentUserProviderInterface;
+use App\Shared\Domain\Contract\BlamableInterface;
+use App\Shared\Domain\Contract\TimestampableInterface;
+use DateTimeImmutable;
+use Doctrine\Bundle\DoctrineBundle\Attribute\AsDoctrineListener;
+use Doctrine\ORM\Event\PrePersistEventArgs;
+use Doctrine\ORM\Event\PreUpdateEventArgs;
+use Doctrine\ORM\Events;
+
+#[AsDoctrineListener(event: Events::prePersist)]
+#[AsDoctrineListener(event: Events::preUpdate)]
+final readonly class TimestampableBlamableSubscriber
+{
+    public function __construct(
+        private CurrentUserProviderInterface $currentUserProvider,
+    ) {}
+
+    public function prePersist(PrePersistEventArgs $args): void
+    {
+        $this->applyOnCreate($args->getObject());
+    }
+
+    public function preUpdate(PreUpdateEventArgs $args): void
+    {
+        $this->applyOnUpdate($args->getObject());
+    }
+
+    public function applyOnCreate(object $entity): void
+    {
+        $now = new DateTimeImmutable();
+
+        if ($entity instanceof TimestampableInterface) {
+            if (null === $entity->getCreatedAt()) {
+                $entity->setCreatedAt($now);
+            }
+            $entity->setUpdatedAt($now);
+        }
+
+        if ($entity instanceof BlamableInterface) {
+            $user = $this->currentUserProvider->getCurrentUser();
+            if (null === $entity->getCreatedBy()) {
+                $entity->setCreatedBy($user);
+            }
+            $entity->setUpdatedBy($user);
+        }
+    }
+
+    public function applyOnUpdate(object $entity): void
+    {
+        if ($entity instanceof TimestampableInterface) {
+            $entity->setUpdatedAt(new DateTimeImmutable());
+        }
+
+        if ($entity instanceof BlamableInterface) {
+            $entity->setUpdatedBy($this->currentUserProvider->getCurrentUser());
+        }
+    }
+}
diff --git a/src/Shared/Infrastructure/Security/SecurityCurrentUserProvider.php b/src/Shared/Infrastructure/Security/SecurityCurrentUserProvider.php
new file mode 100644
index 0000000..2d9a5b3
--- /dev/null
+++ b/src/Shared/Infrastructure/Security/SecurityCurrentUserProvider.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shared\Infrastructure\Security;
+
+use App\Shared\Application\CurrentUserProviderInterface;
+use App\Shared\Domain\Contract\UserInterface;
+use Symfony\Bundle\SecurityBundle\Security;
+
+final readonly class SecurityCurrentUserProvider implements CurrentUserProviderInterface
+{
+    public function __construct(
+        private Security $security,
+    ) {}
+
+    public function getCurrentUser(): ?UserInterface
+    {
+        $user = $this->security->getUser();
+
+        return $user instanceof UserInterface ? $user : null;
+    }
+}
diff --git a/tests/Unit/Shared/Doctrine/TimestampableBlamableSubscriberTest.php b/tests/Unit/Shared/Doctrine/TimestampableBlamableSubscriberTest.php
new file mode 100644
index 0000000..669acf5
--- /dev/null
+++ b/tests/Unit/Shared/Doctrine/TimestampableBlamableSubscriberTest.php
@@ -0,0 +1,91 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Shared\Doctrine;
+
+use App\Shared\Application\CurrentUserProviderInterface;
+use App\Shared\Domain\Contract\BlamableInterface;
+use App\Shared\Domain\Contract\TimestampableInterface;
+use App\Shared\Domain\Contract\UserInterface;
+use App\Shared\Domain\Trait\TimestampableBlamableTrait;
+use App\Shared\Infrastructure\Doctrine\TimestampableBlamableSubscriber;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use stdClass;
+
+/**
+ * @internal
+ */
+final class TimestampableBlamableSubscriberTest extends TestCase
+{
+    public function testApplyOnCreateSetsTimestampsAndAuthor(): void
+    {
+        $user       = $this->makeUser(7);
+        $subscriber = new TimestampableBlamableSubscriber($this->providerReturning($user));
+        $entity     = $this->makeEntity();
+
+        $subscriber->applyOnCreate($entity);
+
+        self::assertInstanceOf(DateTimeImmutable::class, $entity->getCreatedAt());
+        self::assertInstanceOf(DateTimeImmutable::class, $entity->getUpdatedAt());
+        self::assertSame($user, $entity->getCreatedBy());
+        self::assertSame($user, $entity->getUpdatedBy());
+    }
+
+    public function testApplyOnUpdateLeavesCreatedUntouched(): void
+    {
+        $creator = $this->makeUser(1);
+        $editor  = $this->makeUser(2);
+        $entity  = $this->makeEntity();
+
+        new TimestampableBlamableSubscriber($this->providerReturning($creator))->applyOnCreate($entity);
+        $createdAt = $entity->getCreatedAt();
+
+        new TimestampableBlamableSubscriber($this->providerReturning($editor))->applyOnUpdate($entity);
+
+        self::assertSame($createdAt, $entity->getCreatedAt());
+        self::assertSame($creator, $entity->getCreatedBy());
+        self::assertSame($editor, $entity->getUpdatedBy());
+    }
+
+    public function testApplyOnCreateIgnoresNonTimestampableEntities(): void
+    {
+        $subscriber = new TimestampableBlamableSubscriber($this->providerReturning(null));
+
+        // Must not throw.
+        $subscriber->applyOnCreate(new stdClass());
+        $this->addToAssertionCount(1);
+    }
+
+    private function providerReturning(?UserInterface $user): CurrentUserProviderInterface
+    {
+        return new class($user) implements CurrentUserProviderInterface {
+            public function __construct(private ?UserInterface $user) {}
+
+            public function getCurrentUser(): ?UserInterface
+            {
+                return $this->user;
+            }
+        };
+    }
+
+    private function makeUser(int $id): UserInterface
+    {
+        return new class($id) implements UserInterface {
+            public function __construct(private int $id) {}
+
+            public function getId(): ?int
+            {
+                return $this->id;
+            }
+        };
+    }
+
+    private function makeEntity(): object
+    {
+        return new class implements TimestampableInterface, BlamableInterface {
+            use TimestampableBlamableTrait;
+        };
+    }
+}