diff --git a/src/Tagashi File Hub/App/Abstractions/AppBuilder.cs b/src/Tagashi File Hub/App/Abstractions/AppBuilder.cs
new file mode 100644
index 0000000..8e45702
--- /dev/null
+++ b/src/Tagashi File Hub/App/Abstractions/AppBuilder.cs	
@@ -0,0 +1,18 @@
+namespace Tagashi_File_Hub.App.Abstractions;
+
+internal class AppBuilder
+{
+    private List<IStartStep> StartSteps { get; } = new();
+
+    public AppBuilder WithStartStep(IStartStep step)
+    {
+        StartSteps.Add(step);
+
+        return this;
+    }
+
+    public AppBuilder WithStartStep(Func<Task> step)
+    {
+        return WithStartStep(new DelegateStartStep(step));
+    }
+}
\ No newline at end of file
diff --git a/src/Tagashi File Hub/App/Abstractions/DelegateStartStep.cs b/src/Tagashi File Hub/App/Abstractions/DelegateStartStep.cs
new file mode 100644
index 0000000..47fb4c4
--- /dev/null
+++ b/src/Tagashi File Hub/App/Abstractions/DelegateStartStep.cs	
@@ -0,0 +1,16 @@
+namespace Tagashi_File_Hub.App.Abstractions;
+
+internal class DelegateStartStep : IStartStep
+{
+    private readonly Func<Task> _asyncDelegate;
+
+    public DelegateStartStep(Func<Task> asyncDelegate)
+    {
+        _asyncDelegate = asyncDelegate;
+    }
+
+    public async Task RunAsync()
+    {
+        await _asyncDelegate().ConfigureAwait(false);
+    }
+}
\ No newline at end of file
diff --git a/src/Tagashi File Hub/App/Abstractions/IApp.cs b/src/Tagashi File Hub/App/Abstractions/IApp.cs
new file mode 100644
index 0000000..e11b841
--- /dev/null
+++ b/src/Tagashi File Hub/App/Abstractions/IApp.cs	
@@ -0,0 +1,5 @@
+namespace Tagashi_File_Hub.App.Abstractions;
+
+internal interface IApp
+{
+}
\ No newline at end of file
diff --git a/src/Tagashi File Hub/App/Abstractions/IStartStep.cs b/src/Tagashi File Hub/App/Abstractions/IStartStep.cs
new file mode 100644
index 0000000..6055f33
--- /dev/null
+++ b/src/Tagashi File Hub/App/Abstractions/IStartStep.cs	
@@ -0,0 +1,6 @@
+namespace Tagashi_File_Hub.App.Abstractions;
+
+internal interface IStartStep
+{
+    public Task RunAsync();
+}
\ No newline at end of file
diff --git a/src/Tagashi File Hub/App/AppStarter.cs b/src/Tagashi File Hub/App/AppStarter.cs
new file mode 100644
index 0000000..47497ba
--- /dev/null
+++ b/src/Tagashi File Hub/App/AppStarter.cs	
@@ -0,0 +1,5 @@
+namespace Tagashi_File_Hub.App;
+
+internal class AppStarter
+{
+}
\ No newline at end of file
diff --git a/src/Tagashi File Hub/Form1.Designer.cs b/src/Tagashi File Hub/MainForm.Designer.cs
similarity index 97%
rename from src/Tagashi File Hub/Form1.Designer.cs
rename to src/Tagashi File Hub/MainForm.Designer.cs
index 3913125..697d1fc 100644
--- a/src/Tagashi File Hub/Form1.Designer.cs	
+++ b/src/Tagashi File Hub/MainForm.Designer.cs	
@@ -1,6 +1,6 @@
 namespace Tagashi_File_Hub
 {
-    partial class Form1
+    partial class MainForm
     {
         /// <summary>
         ///  Required designer variable.
@@ -28,7 +28,7 @@
         /// </summary>
         private void InitializeComponent()
         {
-            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1));
+            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MainForm));
             SuspendLayout();
             // 
             // Form1
diff --git a/src/Tagashi File Hub/Form1.cs b/src/Tagashi File Hub/MainForm.cs
similarity index 55%
rename from src/Tagashi File Hub/Form1.cs
rename to src/Tagashi File Hub/MainForm.cs
index 6c03ab6..f4aaf2f 100644
--- a/src/Tagashi File Hub/Form1.cs	
+++ b/src/Tagashi File Hub/MainForm.cs	
@@ -1,8 +1,8 @@
 namespace Tagashi_File_Hub;
 
-public partial class Form1 : Form
+public partial class MainForm : Form
 {
-    public Form1()
+    public MainForm()
     {
         InitializeComponent();
     }
diff --git a/src/Tagashi File Hub/Form1.resx b/src/Tagashi File Hub/MainForm.resx
similarity index 100%
rename from src/Tagashi File Hub/Form1.resx
rename to src/Tagashi File Hub/MainForm.resx
diff --git a/src/Tagashi File Hub/Program.cs b/src/Tagashi File Hub/Program.cs
index 4ecbd16..672c0f9 100644
--- a/src/Tagashi File Hub/Program.cs	
+++ b/src/Tagashi File Hub/Program.cs	
@@ -1,17 +1,31 @@
-namespace Tagashi_File_Hub
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace Tagashi_File_Hub;
+
+internal static class Program
 {
-    internal static class Program
+    /// <summary>
+    ///     The main entry point for the application.
+    /// </summary>
+    [STAThread]
+    private static void Main()
     {
-        /// <summary>
-        ///  The main entry point for the application.
-        /// </summary>
-        [STAThread]
-        static void Main()
+        // To customize application configuration such as set high DPI settings or default font,
+        // see https://aka.ms/applicationconfiguration.
+        ApplicationConfiguration.Initialize();
+        Application.EnableVisualStyles();
+        Application.SetCompatibleTextRenderingDefault(false);
+
+        var hostBuilder = new HostBuilder().ConfigureServices((hostContext, services) =>
         {
-            // To customize application configuration such as set high DPI settings or default font,
-            // see https://aka.ms/applicationconfiguration.
-            ApplicationConfiguration.Initialize();
-            Application.Run(new Form1());
-        }
+            services.AddSingleton<MainForm>();
+        });
+
+        using var host = hostBuilder.Build();
+        var serviceProvider = host.Services;
+        var mainForm = serviceProvider.GetService<MainForm>();
+
+        Application.Run(mainForm);
     }
 }
\ No newline at end of file
diff --git a/src/Tagashi File Hub/Startup.cs b/src/Tagashi File Hub/Startup.cs
new file mode 100644
index 0000000..222da36
--- /dev/null
+++ b/src/Tagashi File Hub/Startup.cs	
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Tagashi_File_Hub
+{
+    internal class Startup
+    {
+    }
+}
diff --git a/src/Tagashi File Hub/Tagashi File Hub.csproj b/src/Tagashi File Hub/Tagashi File Hub.csproj
index b2411fe..4b220df 100644
--- a/src/Tagashi File Hub/Tagashi File Hub.csproj	
+++ b/src/Tagashi File Hub/Tagashi File Hub.csproj	
@@ -51,8 +51,16 @@
     </None>
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\TagashiFileHub.Core\TagashiFileHub.Core.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="App\Abstractions\Attributes\" />
+  </ItemGroup>
+
 </Project>
\ No newline at end of file