diff --git a/composer.json b/composer.json
index 0c253c5..84c5fbf 100644
--- a/composer.json
+++ b/composer.json
@@ -32,6 +32,7 @@
         "psr/http-server-middleware": "^1.0.2"
     },
     "require-dev": {
+        "boundwize/structarmed": "^0.18.10",
         "laminas/laminas-coding-standard": "^3.1.0",
         "mikey179/vfsstream": "^1.6.12",
         "phpstan/phpstan": "^2.2.5",
diff --git a/src/ErrorHandler.php b/src/ErrorHandler.php
index 67a409c..d50a87c 100644
--- a/src/ErrorHandler.php
+++ b/src/ErrorHandler.php
@@ -34,7 +34,7 @@ class ErrorHandler implements ErrorHandlerInterface
      */
     public function __construct(callable $responseFactory, ?callable $responseGenerator = null)
     {
-        $this->responseFactory   = function () use ($responseFactory): ResponseInterface {
+        $this->responseFactory   = static function () use ($responseFactory): ResponseInterface {
             return $responseFactory();
         };
         $this->responseGenerator = $responseGenerator ?: new ErrorResponseGenerator();
@@ -89,7 +89,7 @@ public function createErrorHandler(): callable
         /**
          * @throws ErrorException if error is not within the error_reporting mask.
          */
-        return function (int $errno, string $errstr, string $errfile, int $errline): void {
+        return static function (int $errno, string $errstr, string $errfile, int $errline): void {
             if (! (error_reporting() & $errno)) {
                 // error_reporting does not include this error
                 return;
diff --git a/src/Extra/Processor/RequestProcessor.php b/src/Extra/Processor/RequestProcessor.php
index a38af50..e3ad559 100644
--- a/src/Extra/Processor/RequestProcessor.php
+++ b/src/Extra/Processor/RequestProcessor.php
@@ -28,7 +28,7 @@ public function process(array $data): array
             } else {
                 $matches = array_filter(
                     $sensitiveParameters,
-                    fn (string $sensitiveParameter) => str_contains(strtolower($key), $sensitiveParameter)
+                    static fn (string $sensitiveParameter) => str_contains(strtolower($key), $sensitiveParameter)
                 );
 
                 if (! isset($this->sensitiveParameters[ProcessorInterface::ALL]) && count($matches) === 0) {
diff --git a/src/Extra/Processor/ServerProcessor.php b/src/Extra/Processor/ServerProcessor.php
index 56b7cec..4676a08 100644
--- a/src/Extra/Processor/ServerProcessor.php
+++ b/src/Extra/Processor/ServerProcessor.php
@@ -49,7 +49,7 @@ public function process(array $data): array
 
     private function stringToAssociativeArray(string $subject): array
     {
-        return array_reduce(explode('; ', $subject), function (array $result, string $keyValue): array {
+        return array_reduce(explode('; ', $subject), static function (array $result, string $keyValue): array {
             $keyValue             = explode('=', $keyValue, 2);
             $result[$keyValue[0]] = $keyValue[1] ?? '';
 
@@ -60,7 +60,7 @@ private function stringToAssociativeArray(string $subject): array
     private function associativeArrayToString(array $subject): string
     {
         $subject = array_map(
-            fn(string $key, string $value) => sprintf('%s=%s', $key, $value),
+            static fn(string $key, string $value) => sprintf('%s=%s', $key, $value),
             array_keys($subject),
             $subject
         );
diff --git a/src/Extra/Processor/SessionProcessor.php b/src/Extra/Processor/SessionProcessor.php
index f02a570..813cf54 100644
--- a/src/Extra/Processor/SessionProcessor.php
+++ b/src/Extra/Processor/SessionProcessor.php
@@ -13,7 +13,7 @@ class SessionProcessor extends AbstractProcessor
     public function process(array $data): array
     {
         return array_map(
-            fn (iterable $container): array => ArrayUtils::iteratorToArray($container),
+            static fn (iterable $container): array => ArrayUtils::iteratorToArray($container),
             $data
         );
     }
diff --git a/src/Extra/Processor/TraceProcessor.php b/src/Extra/Processor/TraceProcessor.php
index ec632c7..91cb6bf 100644
--- a/src/Extra/Processor/TraceProcessor.php
+++ b/src/Extra/Processor/TraceProcessor.php
@@ -15,7 +15,7 @@ public function process(array $data): array
             /**
              * @param string[] $trace
              */
-            fn (array $trace): string => sprintf(
+            static fn (array $trace): string => sprintf(
                 '%s%s%s:%d',
                 $trace['class'] ?? $trace['file'] ?? 'unknown',
                 $trace['type'] ?? '->',
diff --git a/src/LogErrorHandler.php b/src/LogErrorHandler.php
index d971cf8..0fffaa8 100644
--- a/src/LogErrorHandler.php
+++ b/src/LogErrorHandler.php
@@ -43,7 +43,7 @@ public function __construct(
         ?LoggerInterface $logger = null,
         ?ExtraProvider $extraProvider = null,
     ) {
-        $this->responseFactory   = function () use ($responseFactory): ResponseInterface {
+        $this->responseFactory   = static function () use ($responseFactory): ResponseInterface {
             return $responseFactory();
         };
         $this->responseGenerator = $responseGenerator ?: new ErrorResponseGenerator();
@@ -109,7 +109,7 @@ public function createErrorHandler(): callable
         /**
          * @throws ErrorException if error is not within the error_reporting mask.
          */
-        return function (int $errno, string $errstr, string $errfile, int $errline): void {
+        return static function (int $errno, string $errstr, string $errfile, int $errline): void {
             if (! (error_reporting() & $errno)) {
                 // error_reporting does not include this error
                 return;
diff --git a/structarmed.php b/structarmed.php
new file mode 100644
index 0000000..4ac8eed
--- /dev/null
+++ b/structarmed.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Boundwize\StructArmed\Architecture;
+use Boundwize\StructArmed\Preset\Preset;
+
+return Architecture::define()
+    ->withPresets(Preset::PSR4(), Preset::CODEQUALITY())
+    ->layer('ReplacementStrategy', 'src/Extra/ReplacementStrategy.php')
+    ->layer('Processor', 'src/Extra/Processor')
+    ->layer('Provider', 'src/Extra/Provider')
+    ->layer('Extra', 'src/Extra', [
+        'src/Extra/ReplacementStrategy.php',
+        'src/Extra/Processor',
+        'src/Extra/Provider',
+    ])
+    ->layer('ErrorHandler', 'src', 'src/Extra')
+    ->ruleset([
+        'ReplacementStrategy' => [],
+        'Processor'           => ['ReplacementStrategy'],
+        'Provider'            => ['+Processor'],
+        'Extra'               => ['+Provider'],
+        'ErrorHandler'        => ['+Extra'],
+    ]);