diff --git a/src/Entity/Environment.php b/src/Entity/Environment.php
new file mode 100644
index 0000000..faaeeb4
--- /dev/null
+++ b/src/Entity/Environment.php
@@ -0,0 +1,198 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Entity;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Delete;
+use ApiPlatform\Metadata\Link;
+use ApiPlatform\Metadata\Patch;
+use ApiPlatform\Metadata\Post;
+use App\Repository\EnvironmentRepository;
+use App\State\MaintenanceToggleProcessor;
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new Post(
+            uriTemplate: '/applications/{slug}/environments',
+            uriVariables: [
+                'slug' => new Link(fromClass: Application::class, fromProperty: 'environments'),
+            ],
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+        new Patch(
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+        new Delete(
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+        new Post(
+            uriTemplate: '/environments/{id}/maintenance',
+            security: "is_granted('ROLE_ADMIN')",
+            denormalizationContext: ['groups' => ['maintenance:write']],
+            processor: MaintenanceToggleProcessor::class,
+        ),
+    ],
+    normalizationContext: ['groups' => ['env:read']],
+    denormalizationContext: ['groups' => ['env:write']],
+)]
+#[ORM\Entity(repositoryClass: EnvironmentRepository::class)]
+class Environment
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    #[Groups(['env:read', 'app:detail'])]
+    private ?int $id = null;
+
+    #[ORM\Column(length: 255)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private ?string $name = null;
+
+    #[ORM\Column(length: 255)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private ?string $containerName = null;
+
+    #[ORM\Column(length: 255)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private ?string $deployScriptPath = null;
+
+    #[ORM\Column(length: 255)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private ?string $maintenanceFilePath = null;
+
+    #[ORM\Column(length: 255, nullable: true)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private ?string $appUrl = null;
+
+    #[ORM\ManyToOne(targetEntity: Application::class, inversedBy: 'environments')]
+    #[ORM\JoinColumn(nullable: false)]
+    private ?Application $application = null;
+
+    /** @var Collection<int, LogFile> */
+    #[ORM\OneToMany(targetEntity: LogFile::class, mappedBy: 'environment', cascade: ['persist', 'remove'], orphanRemoval: true)]
+    #[Groups(['env:read', 'env:write', 'app:detail'])]
+    private Collection $logFiles;
+
+    #[Groups(['env:read', 'app:detail'])]
+    private ?bool $maintenance = null;
+
+    public function __construct()
+    {
+        $this->logFiles = new ArrayCollection();
+    }
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getName(): ?string
+    {
+        return $this->name;
+    }
+
+    public function setName(string $name): static
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+
+    public function getContainerName(): ?string
+    {
+        return $this->containerName;
+    }
+
+    public function setContainerName(string $containerName): static
+    {
+        $this->containerName = $containerName;
+
+        return $this;
+    }
+
+    public function getDeployScriptPath(): ?string
+    {
+        return $this->deployScriptPath;
+    }
+
+    public function setDeployScriptPath(string $deployScriptPath): static
+    {
+        $this->deployScriptPath = $deployScriptPath;
+
+        return $this;
+    }
+
+    public function getMaintenanceFilePath(): ?string
+    {
+        return $this->maintenanceFilePath;
+    }
+
+    public function setMaintenanceFilePath(string $maintenanceFilePath): static
+    {
+        $this->maintenanceFilePath = $maintenanceFilePath;
+
+        return $this;
+    }
+
+    public function getAppUrl(): ?string
+    {
+        return $this->appUrl;
+    }
+
+    public function setAppUrl(?string $appUrl): static
+    {
+        $this->appUrl = $appUrl;
+
+        return $this;
+    }
+
+    public function getApplication(): ?Application
+    {
+        return $this->application;
+    }
+
+    public function setApplication(?Application $application): static
+    {
+        $this->application = $application;
+
+        return $this;
+    }
+
+    /** @return Collection<int, LogFile> */
+    public function getLogFiles(): Collection
+    {
+        return $this->logFiles;
+    }
+
+    public function addLogFile(LogFile $logFile): static
+    {
+        if (!$this->logFiles->contains($logFile)) {
+            $this->logFiles->add($logFile);
+            $logFile->setEnvironment($this);
+        }
+
+        return $this;
+    }
+
+    public function removeLogFile(LogFile $logFile): static
+    {
+        if ($this->logFiles->removeElement($logFile)) {
+            if ($logFile->getEnvironment() === $this) {
+                $logFile->setEnvironment(null);
+            }
+        }
+
+        return $this;
+    }
+
+    public function getMaintenance(): bool
+    {
+        return file_exists((string) $this->maintenanceFilePath);
+    }
+}
diff --git a/src/Repository/EnvironmentRepository.php b/src/Repository/EnvironmentRepository.php
new file mode 100644
index 0000000..d5c3102
--- /dev/null
+++ b/src/Repository/EnvironmentRepository.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Repository;
+
+use App\Entity\Environment;
+use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\Persistence\ManagerRegistry;
+
+/**
+ * @extends ServiceEntityRepository<Environment>
+ */
+class EnvironmentRepository extends ServiceEntityRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, Environment::class);
+    }
+}