diff --git a/ECSAPI/ECS/test/test_conf.hpp b/ECSAPI/ECS/test/test_conf.hpp
index 4aded49..5e6ec9e 100644
--- a/ECSAPI/ECS/test/test_conf.hpp
+++ b/ECSAPI/ECS/test/test_conf.hpp
@@ -11,12 +11,12 @@ struct WorldBenchmark : testing::Test
     {
         for (int16_t i = 0; i < 1000; i++)
         {
-            ee_economy::Container resources = {.capacity = 100.0};
+            ee_economy::Container resources {.capacity = 100.0};
             resources.add(ee_economy::RESOURCE_TYPE::COAL, 100.0);
             entt::entity state = world.registerState(i, resources);
 
-            ee_economy::EnterpriseDefaults miner = {
-                .container = {.capacity = 100.0},
+            ee_economy::EnterpriseDefaults miner {
+                .container {.capacity = 100.0},
                 .resourceTarget = ee_economy::RESOURCE_TYPE::GOLD,
                 .baseEfficiency = 1.0
             };
diff --git a/ECSAPI/ECS/test/world.cpp b/ECSAPI/ECS/test/world.cpp
index 3171c71..01d17ef 100644
--- a/ECSAPI/ECS/test/world.cpp
+++ b/ECSAPI/ECS/test/world.cpp
@@ -7,7 +7,7 @@ TEST(WorldTest, RegisterState)
 {
     ee_ecs::World world;
 
-    ee_economy::Container res = {.capacity = 100.0};
+    ee_economy::Container res {.capacity = 100.0};
     res.add(ee_economy::RESOURCE_TYPE::COAL, 98.0);
     entt::entity state = world.registerState(10, res);
 
@@ -37,8 +37,8 @@ TEST(WorldTest, SpawnMiner)
     world.getRegistry().emplace<ee_economy::State>(state, (int16_t)0);
     world.getRegistry().emplace<ee_economy::Container>(state, 100.0);
 
-    ee_economy::EnterpriseDefaults defaults = {
-        .container = {.capacity = 100.0 },
+    ee_economy::EnterpriseDefaults defaults {
+        .container {.capacity = 100.0 },
         .resourceTarget = ee_economy::RESOURCE_TYPE::COAL,
         .baseEfficiency = 1.0,
     };
@@ -62,8 +62,8 @@ TEST(WorldTest, SpawnDeliverer)
     world.getRegistry().emplace<ee_economy::State>(state, (int16_t)0);
     world.getRegistry().emplace<ee_economy::Container>(state, 100.0);
 
-    ee_economy::EnterpriseDefaults defaults = {
-        .container = {.capacity = 100.0 },
+    ee_economy::EnterpriseDefaults defaults {
+        .container {.capacity = 100.0 },
         .resourceTarget = ee_economy::RESOURCE_TYPE::COAL,
         .baseEfficiency = 1.0,
     };
diff --git a/assets/shaders/helloworld.frag.spv b/assets/shaders/helloworld.frag.spv
new file mode 100644
index 0000000..e14329e
Binary files /dev/null and b/assets/shaders/helloworld.frag.spv differ
diff --git a/assets/shaders/helloworld.vert.spv b/assets/shaders/helloworld.vert.spv
new file mode 100644
index 0000000..428182b
Binary files /dev/null and b/assets/shaders/helloworld.vert.spv differ
diff --git a/frontend/include/AssetData.hpp b/frontend/include/AssetData.hpp
index 2f449bd..a6924f6 100644
--- a/frontend/include/AssetData.hpp
+++ b/frontend/include/AssetData.hpp
@@ -12,4 +12,5 @@ struct AssetBinary : AssetData
 
     AssetBinary(uint8_t* &source, size_t sourceSize);
     ~AssetBinary();
-};
\ No newline at end of file
+};
+typedef AssetBinary AssetShader;
\ No newline at end of file
diff --git a/frontend/include/AssetManager.hpp b/frontend/include/AssetManager.hpp
index de0ec41..dd4ec23 100644
--- a/frontend/include/AssetManager.hpp
+++ b/frontend/include/AssetManager.hpp
@@ -27,6 +27,7 @@ public:
         BINARY,
 
         SHADER,
+        MATERIAL,
         IMAGE
     } type = BINARY; 
 
@@ -82,6 +83,8 @@ public:
     void Request(const AssetStreamCommand &command);
     void Request(const AssetStreamCommand::Type &type);
 
+    void LoadShaders();
+    
     void LoadAsync(AssetInfo::Type type, const std::filesystem::path &path);
     AssetHandle& Find(const std::filesystem::path &path);
     void Redirect(AssetHandle &handle, void *resource);
@@ -96,7 +99,7 @@ private:
     IFileSystem *diskSystem;
 
     std::vector<AssetInfo> activeAssets;
-    std::unordered_map<std::filesystem::path, AssetHandle> assetsMapping;
+    std::unordered_map<std::filesystem::path, AssetHandle*> assetsMapping;
     std::vector<size_t> freeAssetSlots;
     std::vector<AssetLoadingEntry> loadingEntries;
 
@@ -111,7 +114,7 @@ private:
 template <Asset T> T& AssetManager::Get(const AssetHandle &handle)
 {
     std::atomic<void*> result;
-    AssetStreamCommand command = {
+    AssetStreamCommand command {
         .type = AssetStreamCommand::GET,
         .target = handle,
         .out = &result
diff --git a/frontend/include/FileSystem.hpp b/frontend/include/FileSystem.hpp
index 81c6e01..1df5a35 100644
--- a/frontend/include/FileSystem.hpp
+++ b/frontend/include/FileSystem.hpp
@@ -46,11 +46,13 @@ public:
     virtual FileHandle& Open(const std::filesystem::path &path, const uint32_t flags) = 0;
     virtual void ReadAsync(FileHandle &file, const uint32_t bufferSize, const uint32_t flags) = 0;
     virtual bool PollReady(FileHandle &file) = 0;
-    virtual void Close(const FileHandle &file) = 0;
+    virtual void Close(FileHandle &file) = 0;
+
+    ~IFileSystem();
 
 protected:
-    std::vector<FileHandle> activeFiles;
-    std::vector<FileHandle> failedFiles;
+    std::vector<FileHandle*> activeFiles;
+    std::vector<FileHandle*> failedFiles;
     std::vector<size_t> freeFileSlots;
 };
 
@@ -60,7 +62,7 @@ public:
     FileHandle& Open(const std::filesystem::path &path, const uint32_t flags) override;
     void ReadAsync(FileHandle &file, const uint32_t bufferSize, uint32_t flags) override;
     bool PollReady(FileHandle &file) override;
-    void Close(const FileHandle &file) override;
+    void Close(FileHandle &file) override;
 
 private:
 
diff --git a/frontend/src/AssetManager.cpp b/frontend/src/AssetManager.cpp
index a1e7a03..adb6c62 100644
--- a/frontend/src/AssetManager.cpp
+++ b/frontend/src/AssetManager.cpp
@@ -1,6 +1,7 @@
 #include "AssetManager.hpp"
 #include "allocator.hpp"
 #include "Logger.h"
+#include <stdexcept>
 
 AssetInfo::AssetInfo(void *resource)
 {
@@ -81,7 +82,7 @@ void AssetManager::Request(const AssetStreamCommand::Type &type)
 
 void AssetManager::LoadAsync(AssetInfo::Type type, const std::filesystem::path &path)
 {
-    AssetStreamCommand command = {
+    AssetStreamCommand command {
         .type = AssetStreamCommand::LOAD,
         .targetPath = path,
         .targetType = type
@@ -92,7 +93,7 @@ void AssetManager::LoadAsync(AssetInfo::Type type, const std::filesystem::path &
 AssetHandle& AssetManager::Find(const std::filesystem::path &path)
 {
     std::atomic<void*> result;
-    AssetStreamCommand command = {
+    AssetStreamCommand command {
         .type = AssetStreamCommand::FIND,
         .targetPath = path,
         .out = &result
@@ -104,7 +105,7 @@ AssetHandle& AssetManager::Find(const std::filesystem::path &path)
 
 void AssetManager::Start()
 {
-    if (isRunning) throw std::exception("Asset Streaming can be started only once");
+    if (isRunning) throw std::logic_error("Asset Streaming can be started only once");
 
     isRunning.store(true);
     streamingThread = std::jthread([this](std::stop_token stop) {
@@ -156,7 +157,7 @@ void AssetManager::Loop()
                 //TODO: functions for each type
                 switch (asset.type)
                 {
-                    case AssetInfo::SHADER:
+                    case AssetInfo::MATERIAL:
                     {
                         break;
                     }
@@ -166,6 +167,7 @@ void AssetManager::Loop()
                         break;
                     }
 
+                    case AssetInfo::SHADER:
                     case AssetInfo::BINARY:
                     default:
                     {
@@ -176,8 +178,13 @@ void AssetManager::Loop()
                     }
                 }
 
-                asset.isReady.store(true);
+                entry.fileOwner->Close(*entry.file);
+#ifndef NDEBUG
+                auto path = entry.file->debugPath.c_str();
+                LOG(INFO, "Asset loaded: [%s]", path);
+#endif
                 entry.file = nullptr;
+                asset.isReady.store(true);
             }
         }
 
@@ -192,7 +199,7 @@ void AssetManager::ProcessCommand(AssetStreamCommand &command)
 	{
 		case AssetStreamCommand::LOAD:
         {
-            LOG(INFO, "LOAD command");
+            LOG(INFO, "LOAD command: [%s]", command.targetPath.c_str());
 
             /* TODO: process path to select FS */
             /* TODO: select between async load and sync job task */
@@ -202,7 +209,7 @@ void AssetManager::ProcessCommand(AssetStreamCommand &command)
 
             diskSystem->ReadAsync(file, static_cast<uint32_t>(file.size), FILE_READ_SEQUENTIAL);
             
-            AssetHandle handle;
+            AssetHandle* handle = Allocate<AssetHandle>();
             AssetInfo asset(nullptr);
             asset.type = command.targetType;
             
@@ -218,11 +225,11 @@ void AssetManager::ProcessCommand(AssetStreamCommand &command)
                 activeAssets.push_back(std::move(asset));
                 assetPos = activeAssets.size() - 1;
             }
-            handle.id = assetPos;
+            handle->id = assetPos;
             assetsMapping[command.targetPath] = handle;
 
-            AssetLoadingEntry loadingEntry = {
-                .handle = handle,
+            AssetLoadingEntry loadingEntry {
+                .handle = *handle,
                 .file = &file,
                 .fileOwner = diskSystem
             };
@@ -234,12 +241,12 @@ void AssetManager::ProcessCommand(AssetStreamCommand &command)
 
         case AssetStreamCommand::FIND:
         {
-            std::unordered_map<std::filesystem::path, AssetHandle>::iterator mapping = assetsMapping.find(command.targetPath);
+            std::unordered_map<std::filesystem::path, AssetHandle*>::iterator mapping = assetsMapping.find(command.targetPath);
             
             if (mapping == assetsMapping.end())
                 break;
 
-            command.out->store(&mapping->second);
+            command.out->store(mapping->second);
 
             command.type = AssetStreamCommand::COMPLETED;
             break;
@@ -280,6 +287,20 @@ void AssetManager::Release()
     }
     activeAssets.clear();
 
+    for (auto &mapping : assetsMapping)
+        Deallocate(mapping.second);
+    assetsMapping.clear();
+
     LOG(INFO, "Asset Streaming is released");
     isRunning.store(false);
+}
+
+void AssetManager::LoadShaders()
+{
+    std::filesystem::path shadersRoot = "assets/shaders";
+    for (const std::filesystem::directory_entry &entry : std::filesystem::directory_iterator(shadersRoot))
+    {
+        if (entry.is_directory()) continue;
+        LoadAsync(AssetInfo::SHADER, entry.path());
+    }
 }
\ No newline at end of file
diff --git a/frontend/src/FileSystem.cpp b/frontend/src/FileSystem.cpp
index 5823320..df92285 100644
--- a/frontend/src/FileSystem.cpp
+++ b/frontend/src/FileSystem.cpp
@@ -1,15 +1,24 @@
 #include "FileSystem.hpp"
 #include "Logger.h"
 #include "allocator.hpp"
+#include <stdexcept>
+
+IFileSystem::~IFileSystem()
+{
+    for (FileHandle* handle : activeFiles)
+        Deallocate(handle);
+    for (FileHandle* handle : failedFiles)
+        Deallocate(handle);
+}
 
 #ifdef _WIN32
 
 FileHandle& NativeFileSystem::Open(const std::filesystem::path &path, const uint32_t flags)
 {
-    FileHandle result;
+    FileHandle* result = Allocate<FileHandle>();
 
     #ifndef NDEBUG
-    result.debugPath = path;
+    result->debugPath = path;
     #endif
 
     DWORD createFileMode = 0;
@@ -33,78 +42,126 @@ FileHandle& NativeFileSystem::Open(const std::filesystem::path &path, const uint
     {
         LOG(ERROR, "Failed to open file %s. Error: %d", path.c_str(), GetLastError());
         failedFiles.push_back(result);
-        return failedFiles[result.id];
+        return *result;
     }
 
-    result.win32Handle = file;
-    result.size = GetFileSize(file, NULL);
-    if (result.size == INVALID_FILE_SIZE)
+    result->win32Handle = file;
+    result->size = GetFileSize(file, NULL);
+    if (result->size == INVALID_FILE_SIZE)
         LOG(ERROR, "Failed to get size of file %s. Error: %d", path.c_str(), GetLastError());
 
     if (freeFileSlots.size() > 0)
     {
-        activeFiles[freeFileSlots.back()] = result;
-        result.id = freeFileSlots.back();
+        size_t pos = freeFileSlots.back();
+        result->id = pos;
+        activeFiles[pos] = result;
         freeFileSlots.pop_back();
     }
     else
     {
+        result->id = activeFiles.size();
         activeFiles.push_back(result);
-        result.id = activeFiles.size() - 1;
     }
 
-    return activeFiles[result.id];
+    return *result;
 }
 
 void NativeFileSystem::ReadAsync(FileHandle &file, const uint32_t bufferSize, const uint32_t flags)
 {
-    file.overlapped = {};
+    file.overlapped = {
+        .hEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr)
+    };
     file.buffer = AllocateArray<uint8_t>(bufferSize);
 
-    ReadFile(
+    BOOL isSync = ReadFile(
         file.win32Handle,
         file.buffer,
         bufferSize,
         NULL,
         &file.overlapped
     );
+
+    if (isSync || GetLastError() != ERROR_IO_PENDING)
+        LOG(ERROR, "File reading is synchronious while asynchronious is awaited");
 }
 
 bool NativeFileSystem::PollReady(FileHandle &file)
 {
-    DWORD transferredSize = 0L;
-    BOOL status = GetOverlappedResult(
-        file.win32Handle,
-        &file.overlapped,
-        &transferredSize,
-        FALSE
-    );
-    if (!status && GetLastError() != ERROR_IO_INCOMPLETE)
-    {
-        LOG(ERROR, "Error in file status. Code: %d", GetLastError());
-        return false;
-    }
+    // DWORD transferredSize = 0L;
+    // BOOL status = GetOverlappedResult(
+    //     file.win32Handle,
+    //     &file.overlapped,
+    //     &transferredSize,
+    //     FALSE
+    // );
+    
+    // DWORD error = GetLastError();
+    // if (!status && error != ERROR_IO_INCOMPLETE)
+    // {
+    //     LOG(CRITICAL, "Error in reading file status. Code: %d", error);
+    //     throw std::runtime_error("Error in reading file status");
+    // }
 
-    if (file.size == transferredSize)
-    {
-        file.data = file.buffer;
-    }
-    else
-    {
-        /* TODO: reserve size for data, shift and move */
-    }
-    file.buffer = nullptr;
+    // if (file.size == transferredSize)
+    // {
+    //     file.data = file.buffer;
+    // }
+    // else
+    // {
+    //     /* TODO: reserve size for data, shift and move */
+    // }
+    // file.buffer = nullptr;
 
-    return status;
+    DWORD status = WaitForSingleObject(file.overlapped.hEvent, 0);
+
+    switch (status)
+    {
+        case WAIT_OBJECT_0:
+        {
+            if (file.size == file.bufferSize)
+            {
+                file.data = file.buffer;
+            }
+            else
+            {
+                /* TODO: reserve size for data, shift and move */
+            }
+
+            break;
+        }
+
+        case WAIT_ABANDONED:
+        case WAIT_TIMEOUT:
+            return false;
+
+        default:
+        {
+            LOG(CRITICAL, "Failed to get file status. Error: %d", GetLastError());
+            throw std::runtime_error("Failed to get file status");
+        }
+    }
+    
+    return true;
 }
 
-void NativeFileSystem::Close(const FileHandle &file)
+void NativeFileSystem::Close(FileHandle &file)
 {
-    DeallocateArray(file.buffer);
-    DeallocateArray(file.data);
+    if (file.buffer != nullptr)
+    {
+        DeallocateArray(file.buffer);
+        file.buffer = nullptr;
+    }
+    if (file.data != nullptr)
+    {
+        DeallocateArray(file.data);
+        file.data = nullptr;
+    }
 
-    CloseHandle(file.win32Handle);
-    activeFiles[file.id].win32Handle = INVALID_HANDLE_VALUE;
+    if (file.win32Handle != INVALID_HANDLE_VALUE)
+    {
+        CloseHandle(file.win32Handle);
+        file.win32Handle = INVALID_HANDLE_VALUE;
+    }
     freeFileSlots.push_back(file.id);
 }
 
diff --git a/frontend/src/Renderer.cpp b/frontend/src/Renderer.cpp
index f84a806..80bdca9 100644
--- a/frontend/src/Renderer.cpp
+++ b/frontend/src/Renderer.cpp
@@ -6,8 +6,8 @@
 #include "Logger.h"
 #include <allocator.hpp>
 #include <algorithm>
-#include <exception>
 #include <set>
+#include <stdexcept>
 
 Renderer::Renderer(SDL_Window *window) : isRunning(false)
 {
@@ -228,7 +228,7 @@ void Renderer::SetupDevice()
 		if (deviceProperties.deviceType == VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU)
 			priority += GPU_DISCRETE_PRIORITY;
 
-		for (VkSurfaceFormatKHR format : surfaceInfoBuffer.availableFormats)
+		for (const VkSurfaceFormatKHR &format : surfaceInfoBuffer.availableFormats)
 		{
 			surfaceInfoBuffer.format = format;
 			if (format.format == VK_FORMAT_B8G8R8_SRGB && format.colorSpace == VK_COLOR_SPACE_SRGB_NONLINEAR_KHR)
@@ -239,7 +239,7 @@ void Renderer::SetupDevice()
 		}
 
 		surfaceInfoBuffer.presentMode = VK_PRESENT_MODE_FIFO_KHR;
-		for (VkPresentModeKHR presentMode : surfaceInfoBuffer.availablePresentModes)
+		for (const VkPresentModeKHR &presentMode : surfaceInfoBuffer.availablePresentModes)
 		{
 			if (presentMode == VK_PRESENT_MODE_FIFO_RELAXED_KHR)
 			{
@@ -265,7 +265,7 @@ void Renderer::SetupDevice()
 
 	// Define queues
 	std::vector<VkDeviceQueueCreateInfo> queuesCreateConfigs;
-	std::set<uint32_t> uniqueQueueFamilies = {
+	std::set<uint32_t> uniqueQueueFamilies {
 		queueFamilies.graphics,
 		queueFamilies.present
 	};
@@ -284,11 +284,11 @@ void Renderer::SetupDevice()
 	}
 
 	// Create logical device
-	std::vector<const char*> deviceExtensions = {
+	std::vector<const char*> deviceExtensions {
 		VK_KHR_SWAPCHAIN_EXTENSION_NAME
 	};
 
-	VkDeviceCreateInfo deviceInfo = {
+	VkDeviceCreateInfo deviceInfo {
 		.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,
 		.pNext = nullptr,
 		.queueCreateInfoCount = static_cast<uint32_t>(queuesCreateConfigs.size()),
@@ -355,7 +355,7 @@ void Renderer::SetupSwapchain()
 
 	if (queueFamilies.graphics != queueFamilies.present)
 	{
-		uint32_t queueFamiliesShare[] = {queueFamilies.graphics, queueFamilies.present};
+		uint32_t queueFamiliesShare[] {queueFamilies.graphics, queueFamilies.present};
 		swapchainCreateConfig.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
 		swapchainCreateConfig.queueFamilyIndexCount = 2;
 		swapchainCreateConfig.pQueueFamilyIndices = queueFamiliesShare;
@@ -386,13 +386,13 @@ void Renderer::SetupSwapchain()
 			.image = frames[i],
 			.viewType = VK_IMAGE_VIEW_TYPE_2D,
 			.format = surfaceInfo.format.format,
-			.components = {
+			.components {
 				.r = VK_COMPONENT_SWIZZLE_IDENTITY,
 				.g = VK_COMPONENT_SWIZZLE_IDENTITY,
 				.b = VK_COMPONENT_SWIZZLE_IDENTITY,
 				.a = VK_COMPONENT_SWIZZLE_IDENTITY
 			},
-			.subresourceRange = {
+			.subresourceRange {
 				.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT,
 				.baseMipLevel = 0,
 				.levelCount = 1,
@@ -413,7 +413,7 @@ void Renderer::Start()
 	if (isRunning)
 	{
 		LOG(CRITICAL, "Renderer can be started only once");
-		throw std::exception("Renderer can be started only once");
+		throw std::logic_error("Renderer can be started only once");
 	}
 
     isRunning.store(true);
@@ -493,7 +493,7 @@ void Renderer::Request(const RenderCommand::Type &type)
 
 void Renderer::Release()
 {
-	for (VkImageView frameView : frameViews)
+	for (VkImageView &frameView : frameViews)
 	{
 		vkDestroyImageView(device, frameView, nullptr);
 	}
diff --git a/frontend/src/main.cpp b/frontend/src/main.cpp
index 3e3d5c4..7ebd423 100644
--- a/frontend/src/main.cpp
+++ b/frontend/src/main.cpp
@@ -43,6 +43,7 @@ int SDL_main(int argc, char **argv)
 	// Setup assets
 	AssetManager assetManager;
 	assetManager.Start();
+	assetManager.LoadShaders();
 
 	// Setup Renderer
 	Renderer renderer(window);
diff --git a/shaders/helloworld/helloworld.frag b/shaders/helloworld/helloworld.frag
new file mode 100644
index 0000000..9e32b50
--- /dev/null
+++ b/shaders/helloworld/helloworld.frag
@@ -0,0 +1,8 @@
+#version 330
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    outColor = vec4(1.0, 0.0, 0.0, 1.0);
+}
\ No newline at end of file
diff --git a/shaders/helloworld/helloworld.vert b/shaders/helloworld/helloworld.vert
new file mode 100644
index 0000000..d83cd4c
--- /dev/null
+++ b/shaders/helloworld/helloworld.vert
@@ -0,0 +1,12 @@
+#version 330
+
+vec2 positions[3] = vec2[](
+    vec2(-1.0, 1.0),
+    vec2(0.0, -1.0),
+    vec2(1.0, 1.0)
+);
+
+void main()
+{
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+}
\ No newline at end of file