diff --git a/composer.json b/composer.json
index e98ca96..ea9488c 100644
--- a/composer.json
+++ b/composer.json
@@ -83,6 +83,7 @@
         "zircote/swagger-php": "^6.0.0"
     },
     "require-dev": {
+        "boundwize/structarmed": "^0.17.12",
         "dotkernel/dot-maker": "^2.0.0",
         "laminas/laminas-coding-standard": "^3.0.1",
         "laminas/laminas-development-mode": "^3.13.0",
diff --git a/src/App/src/Factory/ProblemDetailsDelegatorFactory.php b/src/App/src/Factory/ProblemDetailsDelegatorFactory.php
index fb0a6c9..e8487d4 100644
--- a/src/App/src/Factory/ProblemDetailsDelegatorFactory.php
+++ b/src/App/src/Factory/ProblemDetailsDelegatorFactory.php
@@ -41,7 +41,7 @@ public function __invoke(
         $errorHandler = $container->get(ErrorHandlerInterface::class);
         assert($errorHandler instanceof LogErrorHandler);
 
-        $listener = function (Throwable $throwable, RequestInterface $request) use ($errorHandler) {
+        $listener = static function (Throwable $throwable, RequestInterface $request) use ($errorHandler) {
             assert($request instanceof ServerRequestInterface);
             $errorHandler->handleThrowable($throwable, $request);
         };
diff --git a/src/App/src/Factory/UserIdentityFactory.php b/src/App/src/Factory/UserIdentityFactory.php
index f2c3a23..436c5b4 100644
--- a/src/App/src/Factory/UserIdentityFactory.php
+++ b/src/App/src/Factory/UserIdentityFactory.php
@@ -12,7 +12,7 @@ class UserIdentityFactory
 {
     public function __invoke(ContainerInterface $container): callable
     {
-        return function (string $identity, array $roles = [], array $details = []): UserInterface {
+        return static function (string $identity, array $roles = [], array $details = []): UserInterface {
             /** @var non-empty-string $identity */
             return new UserIdentity($identity, $roles, $details);
         };
diff --git a/src/App/src/Middleware/AuthorizationMiddleware.php b/src/App/src/Middleware/AuthorizationMiddleware.php
index fe35f5a..b8a8065 100644
--- a/src/App/src/Middleware/AuthorizationMiddleware.php
+++ b/src/App/src/Middleware/AuthorizationMiddleware.php
@@ -75,7 +75,7 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
         }
 
         $defaultUser->setRoles(
-            array_map(fn (RoleInterface $role): string => (string) $role->getName()->value, $user->getRoles())
+            array_map(static fn (RoleInterface $role): string => (string) $role->getName()->value, $user->getRoles())
         );
 
         $request = $request->withAttribute(UserInterface::class, $defaultUser);
diff --git a/src/App/src/Middleware/ContentNegotiationMiddleware.php b/src/App/src/Middleware/ContentNegotiationMiddleware.php
index 39590bc..f511d32 100644
--- a/src/App/src/Middleware/ContentNegotiationMiddleware.php
+++ b/src/App/src/Middleware/ContentNegotiationMiddleware.php
@@ -128,7 +128,7 @@ private function parseAcceptHeader(string $header): array
         }
 
         // Sort by quality in descending order
-        usort($types, fn ($a, $b) => $b['quality'] <=> $a['quality']);
+        usort($types, static fn ($a, $b) => $b['quality'] <=> $a['quality']);
 
         return $types;
     }
diff --git a/src/App/src/Middleware/DeprecationMiddleware.php b/src/App/src/Middleware/DeprecationMiddleware.php
index 1ae0018..1f47851 100644
--- a/src/App/src/Middleware/DeprecationMiddleware.php
+++ b/src/App/src/Middleware/DeprecationMiddleware.php
@@ -86,7 +86,8 @@ private function getAttribute(array $attributes): ?array
         return array_values(
             array_filter(
                 $attributes,
-                fn (array $attribute): bool => $attribute['deprecationType'] === self::RESOURCE_DEPRECATION_ATTRIBUTE
+                static fn (array $attribute): bool
+                => $attribute['deprecationType'] === self::RESOURCE_DEPRECATION_ATTRIBUTE
             )
         )[0] ?? null;
     }
diff --git a/src/Core/src/Admin/src/Entity/Admin.php b/src/Core/src/Admin/src/Entity/Admin.php
index fde0af4..9692c92 100644
--- a/src/Core/src/Admin/src/Entity/Admin.php
+++ b/src/Core/src/Admin/src/Entity/Admin.php
@@ -241,7 +241,10 @@ public function getArrayCopy(): array
             'firstName' => $this->firstName,
             'lastName'  => $this->lastName,
             'status'    => $this->status->value,
-            'roles'     => array_map(fn (RoleInterface $role): array => $role->getArrayCopy(), $this->roles->toArray()),
+            'roles'     => array_map(
+                static fn (RoleInterface $role): array => $role->getArrayCopy(),
+                $this->roles->toArray()
+            ),
             'created'   => $this->created,
             'updated'   => $this->updated,
         ];
diff --git a/src/Core/src/Admin/src/Enum/AdminStatusEnum.php b/src/Core/src/Admin/src/Enum/AdminStatusEnum.php
index 9fd605a..eb44b15 100644
--- a/src/Core/src/Admin/src/Enum/AdminStatusEnum.php
+++ b/src/Core/src/Admin/src/Enum/AdminStatusEnum.php
@@ -25,7 +25,7 @@ public static function values(): array
      */
     public static function toArray(): array
     {
-        return array_reduce(self::cases(), function (array $collector, self $enum): array {
+        return array_reduce(self::cases(), static function (array $collector, self $enum): array {
             $collector[$enum->value] = $enum->name;
 
             return $collector;
diff --git a/src/Core/src/App/src/DBAL/Types/AbstractEnumType.php b/src/Core/src/App/src/DBAL/Types/AbstractEnumType.php
index 4383697..795f4b8 100644
--- a/src/Core/src/App/src/DBAL/Types/AbstractEnumType.php
+++ b/src/Core/src/App/src/DBAL/Types/AbstractEnumType.php
@@ -26,7 +26,7 @@ public function getSQLDeclaration(array $column, AbstractPlatform $platform): st
             return 'TEXT';
         }
 
-        $values = array_map(fn($case) => "'$case->value'", $this->getEnumCases());
+        $values = array_map(static fn($case) => "'$case->value'", $this->getEnumCases());
 
         return sprintf('ENUM(%s)', implode(', ', $values));
     }
diff --git a/src/Core/src/User/src/Entity/User.php b/src/Core/src/User/src/Entity/User.php
index d6d9886..ece0b09 100644
--- a/src/Core/src/User/src/Entity/User.php
+++ b/src/Core/src/User/src/Entity/User.php
@@ -361,7 +361,10 @@ public function getArrayCopy(): array
             'hash'     => $this->hash,
             'identity' => $this->identity,
             'status'   => $this->status->value,
-            'roles'    => array_map(fn (RoleInterface $role): array => $role->getArrayCopy(), $this->roles->toArray()),
+            'roles'    => array_map(
+                static fn (RoleInterface $role): array => $role->getArrayCopy(),
+                $this->roles->toArray()
+            ),
             'created'  => $this->created,
             'updated'  => $this->updated,
         ];
diff --git a/src/Core/src/User/src/Enum/UserRoleEnum.php b/src/Core/src/User/src/Enum/UserRoleEnum.php
index b2d89bd..80e91d9 100644
--- a/src/Core/src/User/src/Enum/UserRoleEnum.php
+++ b/src/Core/src/User/src/Enum/UserRoleEnum.php
@@ -17,7 +17,7 @@ enum UserRoleEnum: string
      */
     public static function validCases(): array
     {
-        return array_filter(self::cases(), fn (self $value) => $value !== self::Guest);
+        return array_filter(self::cases(), static fn (self $value) => $value !== self::Guest);
     }
 
     /**
diff --git a/src/Core/src/User/src/Enum/UserStatusEnum.php b/src/Core/src/User/src/Enum/UserStatusEnum.php
index ecaa696..8ab061a 100644
--- a/src/Core/src/User/src/Enum/UserStatusEnum.php
+++ b/src/Core/src/User/src/Enum/UserStatusEnum.php
@@ -35,7 +35,7 @@ public static function validValues(): array
      */
     public static function validCases(): array
     {
-        return array_filter(self::cases(), fn (self $enum) => $enum !== self::Deleted);
+        return array_filter(self::cases(), static fn (self $enum) => $enum !== self::Deleted);
     }
 
     /**
@@ -43,7 +43,7 @@ public static function validCases(): array
      */
     public static function toArray(): array
     {
-        return array_reduce(self::validCases(), function (array $collector, self $enum): array {
+        return array_reduce(self::validCases(), static function (array $collector, self $enum): array {
             $collector[$enum->value] = $enum->name;
 
             return $collector;
diff --git a/structarmed.php b/structarmed.php
new file mode 100644
index 0000000..dbbfc4e
--- /dev/null
+++ b/structarmed.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+use Boundwize\StructArmed\Architecture;
+use Boundwize\StructArmed\Preset\Preset;
+
+return Architecture::define()
+    ->withPresets(Preset::PSR4(), Preset::CODEQUALITY())
+    ->layerPattern('CoreApp', '/^Core\\\\App\\\\.*$/', '/^Core\\\\App\\\\Fixture\\\\.*$/')
+    ->layer('CoreFixture', 'src/Core/src/App/src/Fixture')
+    ->layer('CoreSetting', 'src/Core/src/Setting/src')
+    ->layer('CoreAdmin', 'src/Core/src/Admin/src')
+    ->layer('CoreSecurity', 'src/Core/src/Security/src')
+    ->layer('CoreUser', 'src/Core/src/User/src')
+    ->layer('App', 'src/App/src')
+    ->layer('Security', 'src/Security/src')
+    ->layer('Admin', 'src/Admin/src')
+    ->layer('User', 'src/User/src')
+    ->ruleset([
+        'CoreApp'      => ['CoreUser'],
+        'CoreSetting'  => ['+CoreApp', 'CoreAdmin'],
+        'CoreAdmin'    => ['+CoreSetting'],
+        'CoreSecurity' => ['+CoreAdmin'],
+        'CoreUser'     => ['+CoreSecurity'],
+        'CoreFixture'  => ['+CoreUser'],
+        'App'          => ['+CoreUser'],
+        'Security'     => ['+App'],
+        'Admin'        => ['+App'],
+        'User'         => ['+App'],
+    ]);
diff --git a/test/Unit/App/Template/ParserTest.php b/test/Unit/App/Template/ParserTest.php
index 53e2036..d93938b 100644
--- a/test/Unit/App/Template/ParserTest.php
+++ b/test/Unit/App/Template/ParserTest.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace App\Template;
+namespace ApiTest\Unit\App\Template;
 
 use Api\App\Template\Parser;
 use Api\App\Template\ParserInterface;
diff --git a/test/Unit/App/Template/RendererTest.php b/test/Unit/App/Template/RendererTest.php
index e2122f7..87d359f 100644
--- a/test/Unit/App/Template/RendererTest.php
+++ b/test/Unit/App/Template/RendererTest.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace App\Template;
+namespace ApiTest\Unit\App\Template;
 
 use Api\App\Exception\RuntimeException;
 use Api\App\Template\Parser;