diff --git a/composer.json b/composer.json
index 76af70f4d20..feff2ff6699 100644
--- a/composer.json
+++ b/composer.json
@@ -29,10 +29,10 @@
     },
     "autoload": {
         "psr-4": {
-            "App\\": "app"
+            "App\\": "src"
         },
         "files": [
-            "app/functions.php"
+            "src/functions.php"
         ]
     },
     "autoload-dev": {
diff --git a/ecs.php b/ecs.php
index 82a100d840f..f96fec78501 100644
--- a/ecs.php
+++ b/ecs.php
@@ -6,7 +6,7 @@
 use Symplify\EasyCodingStandard\Config\ECSConfig;
 
 return ECSConfig::configure()
-    ->withPaths([__DIR__ . '/config', __DIR__ . '/app', __DIR__ . '/tests'])
+    ->withPaths([__DIR__ . '/config', __DIR__ . '/src', __DIR__ . '/tests'])
     ->withRootFiles()
     ->withPreparedSets(psr12: true, common: true, strict: true)
     ->withRules([LineLengthFixer::class]);
diff --git a/rector.php b/rector.php
index 200239c495e..8ed58261918 100644
--- a/rector.php
+++ b/rector.php
@@ -6,7 +6,7 @@
 use Rector\TypeDeclaration\Rector\StmtsAwareInterface\DeclareStrictTypesRector;
 
 return RectorConfig::configure()
-    ->withPaths([__DIR__ . '/app', __DIR__ . '/bootstrap/app.php', __DIR__ . '/config', __DIR__ . '/tests'])
+    ->withPaths([__DIR__ . '/src', __DIR__ . '/bootstrap/app.php', __DIR__ . '/config', __DIR__ . '/tests'])
     ->withImportNames(removeUnusedImports: true)
     ->withRules([DeclareStrictTypesRector::class])
     ->withPreparedSets(
diff --git a/app/Console/Commands/TweetPostCommand.php b/src/Console/Commands/TweetPostCommand.php
similarity index 100%
rename from app/Console/Commands/TweetPostCommand.php
rename to src/Console/Commands/TweetPostCommand.php
diff --git a/app/Console/ConsoleKernel.php b/src/Console/ConsoleKernel.php
similarity index 100%
rename from app/Console/ConsoleKernel.php
rename to src/Console/ConsoleKernel.php
diff --git a/app/DependencyInjection/ContainerFactory.php b/src/DependencyInjection/ContainerFactory.php
similarity index 100%
rename from app/DependencyInjection/ContainerFactory.php
rename to src/DependencyInjection/ContainerFactory.php
diff --git a/app/Entity/Post.php b/src/Entity/Post.php
similarity index 100%
rename from app/Entity/Post.php
rename to src/Entity/Post.php
diff --git a/app/EntityFactory/PostFactory.php b/src/EntityFactory/PostFactory.php
similarity index 100%
rename from app/EntityFactory/PostFactory.php
rename to src/EntityFactory/PostFactory.php
diff --git a/app/Enum/Design.php b/src/Enum/Design.php
similarity index 100%
rename from app/Enum/Design.php
rename to src/Enum/Design.php
diff --git a/app/Enum/FontFile.php b/src/Enum/FontFile.php
similarity index 100%
rename from app/Enum/FontFile.php
rename to src/Enum/FontFile.php
diff --git a/app/Enum/GptModel.php b/src/Enum/GptModel.php
similarity index 100%
rename from app/Enum/GptModel.php
rename to src/Enum/GptModel.php
diff --git a/app/Exception/ShouldNotHappenException.php b/src/Exception/ShouldNotHappenException.php
similarity index 100%
rename from app/Exception/ShouldNotHappenException.php
rename to src/Exception/ShouldNotHappenException.php
diff --git a/app/FileSystem/PathAnalyzer.php b/src/FileSystem/PathAnalyzer.php
similarity index 100%
rename from app/FileSystem/PathAnalyzer.php
rename to src/FileSystem/PathAnalyzer.php
diff --git a/app/Http/Controllers/HomepageController.php b/src/Http/Controllers/HomepageController.php
similarity index 100%
rename from app/Http/Controllers/HomepageController.php
rename to src/Http/Controllers/HomepageController.php
diff --git a/app/Http/Controllers/PostController.php b/src/Http/Controllers/PostController.php
similarity index 100%
rename from app/Http/Controllers/PostController.php
rename to src/Http/Controllers/PostController.php
diff --git a/app/Http/Controllers/RssController.php b/src/Http/Controllers/RssController.php
similarity index 100%
rename from app/Http/Controllers/RssController.php
rename to src/Http/Controllers/RssController.php
diff --git a/app/Http/Controllers/ShareBoardController.php b/src/Http/Controllers/ShareBoardController.php
similarity index 100%
rename from app/Http/Controllers/ShareBoardController.php
rename to src/Http/Controllers/ShareBoardController.php
diff --git a/app/Http/Controllers/ThumbnailController.php b/src/Http/Controllers/ThumbnailController.php
similarity index 100%
rename from app/Http/Controllers/ThumbnailController.php
rename to src/Http/Controllers/ThumbnailController.php
diff --git a/app/Http/Controllers/ToolsController.php b/src/Http/Controllers/ToolsController.php
similarity index 100%
rename from app/Http/Controllers/ToolsController.php
rename to src/Http/Controllers/ToolsController.php
diff --git a/app/Providers/AppServiceProvider.php b/src/Providers/AppServiceProvider.php
similarity index 100%
rename from app/Providers/AppServiceProvider.php
rename to src/Providers/AppServiceProvider.php
diff --git a/app/Repository/PostRepository.php b/src/Repository/PostRepository.php
similarity index 100%
rename from app/Repository/PostRepository.php
rename to src/Repository/PostRepository.php
diff --git a/app/Repository/ToolRepository.php b/src/Repository/ToolRepository.php
similarity index 100%
rename from app/Repository/ToolRepository.php
rename to src/Repository/ToolRepository.php
diff --git a/app/Socials/PostTweetGenerator.php b/src/Socials/PostTweetGenerator.php
similarity index 100%
rename from app/Socials/PostTweetGenerator.php
rename to src/Socials/PostTweetGenerator.php
diff --git a/app/ValueObject/PostTweet.php b/src/ValueObject/PostTweet.php
similarity index 100%
rename from app/ValueObject/PostTweet.php
rename to src/ValueObject/PostTweet.php
diff --git a/app/ValueObject/Tool.php b/src/ValueObject/Tool.php
similarity index 100%
rename from app/ValueObject/Tool.php
rename to src/ValueObject/Tool.php
diff --git a/app/functions.php b/src/functions.php
similarity index 100%
rename from app/functions.php
rename to src/functions.php