diff --git a/ChronoFlow.Controller/LoginController.cs b/ChronoFlow.Controller/LoginController.cs
new file mode 100644
index 0000000..e10bdb9
--- /dev/null
+++ b/ChronoFlow.Controller/LoginController.cs
@@ -0,0 +1,29 @@
+// Datei: Controller/LoginController.cs
+using ChronoFlow.Model;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ChronoFlow.Controller;
+
+///<summary>
+/// Verwaltet die Authentifizierung von Benutzern.
+/// </summary>
+
+public class LoginController
+{
+    //Beispielhafte Benutzerliste (später DB)
+    private List<User> _users = new()
+    {
+        new User { Username = "admin", Password = "admin123", Role = "Admin" },
+        new User { Username = "max", Password = "max123", Role = "Mitarbeiter" }
+    };
+
+    /// <summary>
+    /// Prüft, ob ein Benutzer mit den eingegebenen Daten existiert.
+    /// </summary>
+
+    public User? Authenticate(string username, string password)
+    {
+        return _users.FirstOrDefault(u => u.Username == username && u.Password == password);
+    }
+}
diff --git a/ChronoFlow.Model/User.cs b/ChronoFlow.Model/User.cs
new file mode 100644
index 0000000..27c19ca
--- /dev/null
+++ b/ChronoFlow.Model/User.cs
@@ -0,0 +1,14 @@
+namespace ChronoFlow.Model
+{
+
+    ///<summary>
+    /// Repräsentiert einen Benutzer mit Benutzernamen, Passwort und Rolle.
+    /// </summary>
+
+    public class User
+    {
+        public string Username { get; set; }
+        public string Password { get; set; } //vorerst im Klartext, wird später geändert
+        public string Role { get; set; } //"Admin" oder "Mitarbeiter"
+    }
+}
\ No newline at end of file
diff --git a/ChronoFlow.View/App.axaml b/ChronoFlow.View/App.axaml
index c69542f..dafeae2 100644
--- a/ChronoFlow.View/App.axaml
+++ b/ChronoFlow.View/App.axaml
@@ -1,6 +1,6 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="ChronoFlow.View.App"
+             x:Class="ChronoFlow.App"
              RequestedThemeVariant="Default">
              <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
 
diff --git a/ChronoFlow.View/App.axaml.cs b/ChronoFlow.View/App.axaml.cs
index 728091e..e27c051 100644
--- a/ChronoFlow.View/App.axaml.cs
+++ b/ChronoFlow.View/App.axaml.cs
@@ -1,8 +1,9 @@
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
+using ChronoFlow.View;
 
-namespace ChronoFlow.View;
+namespace ChronoFlow;
 
 public partial class App : Application
 {
@@ -15,7 +16,8 @@ public partial class App : Application
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            desktop.MainWindow = new MainWindow();
+            // Starte das Programm mit dem Login-Fenster
+            desktop.MainWindow = new LoginWindow();
         }
 
         base.OnFrameworkInitializationCompleted();
diff --git a/ChronoFlow.View/ChronoFlow.View.csproj b/ChronoFlow.View/ChronoFlow.View.csproj
index f058610..1797e5c 100644
--- a/ChronoFlow.View/ChronoFlow.View.csproj
+++ b/ChronoFlow.View/ChronoFlow.View.csproj
@@ -24,4 +24,14 @@
       <ProjectReference Include="..\ChronoFlow.Controller\ChronoFlow.Controller.csproj" />
       <ProjectReference Include="..\ChronoFlow.Model\ChronoFlow.Model.csproj" />
     </ItemGroup>
+
+    <ItemGroup>
+      <Folder Include="Assets\" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <Compile Update="ZeiterfassungView.axaml.cs">
+        <DependentUpon>ZeiterfassungView.axaml</DependentUpon>
+      </Compile>
+    </ItemGroup>
 </Project>
diff --git a/ChronoFlow.View/LoginWindow.axaml b/ChronoFlow.View/LoginWindow.axaml
new file mode 100644
index 0000000..15c7f6c
--- /dev/null
+++ b/ChronoFlow.View/LoginWindow.axaml
@@ -0,0 +1,18 @@
+<!-- Datei: View/LoginWindow.axaml -->
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="ChronoFlow.View.LoginWindow"
+        Title="ChronoFlow Login" Width="400" Height="250" WindowStartupLocation="CenterScreen">
+
+    <StackPanel Margin="20" Spacing="10">
+        <TextBlock Text="ChronoFlow – Login" FontWeight="Bold" FontSize="18" HorizontalAlignment="Center"/>
+        
+        <TextBox x:Name="UsernameBox" Watermark="Benutzername"/>
+        <TextBlock Text="PasswordBox" FontSize="18" TextAlignment="Center" Margin="0,0,0,10"/>
+        <TextBox x:Name = "PasswordBox" PasswordChar="*" Text="Enabled"/>
+
+        <TextBlock x:Name="ErrorText" Foreground="Red" IsVisible="False"/>
+
+        <Button Content="Anmelden" Click="LoginButton_Click" HorizontalAlignment="Center"/>
+    </StackPanel>
+</Window>
\ No newline at end of file
diff --git a/ChronoFlow.View/LoginWindow.axaml.cs b/ChronoFlow.View/LoginWindow.axaml.cs
new file mode 100644
index 0000000..d732ab1
--- /dev/null
+++ b/ChronoFlow.View/LoginWindow.axaml.cs
@@ -0,0 +1,46 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using ChronoFlow.Controller;
+
+namespace ChronoFlow.View
+{
+    /// <summary>
+    /// Das Fenster für den Benutzer-Login.
+    /// </summary>
+    public partial class LoginWindow : Window
+    {
+        private LoginController _loginController;
+
+        public LoginWindow()
+        {
+            InitializeComponent(); // Verbindet XAML mit diesem Code
+            _loginController = new LoginController(); // Unsere "Logik-Klasse"
+        }
+
+        /// <summary>
+        /// Wird ausgeführt, wenn der Benutzer auf "Anmelden" klickt.
+        /// </summary>
+        private void LoginButton_Click(object? sender, RoutedEventArgs e)
+        {
+            // Holt Benutzername und Passwort aus den Eingabefeldern
+            string username = UsernameBox?.Text ?? string.Empty;
+            string password = PasswordBox?.Text ?? string.Empty;
+            // Übergibt die Eingaben an den LoginController
+            var user = _loginController.Authenticate(username, password);
+
+            if (user != null)
+            {
+                // Wenn erfolgreich: öffne das MainWindow
+                var main = new MainWindow(user);
+                main.Show();
+                this.Close(); // Schließe das Login-Fenster
+            }
+            else
+            {
+                // Wenn fehlgeschlagen: Fehlermeldung anzeigen
+                ErrorText.Text = "Login fehlgeschlagen. Bitte prüfen Sie Ihre Eingaben.";
+                ErrorText.IsVisible = true;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/ChronoFlow.View/MainWindow.axaml b/ChronoFlow.View/MainWindow.axaml
index c4795b0..89be531 100644
--- a/ChronoFlow.View/MainWindow.axaml
+++ b/ChronoFlow.View/MainWindow.axaml
@@ -5,5 +5,21 @@
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
         x:Class="ChronoFlow.View.MainWindow"
         Title="ChronoFlow.View">
-    Welcome to Avalonia!
-</Window>
+
+    <SplitView x:Name="PaneView" DisplayMode="CompactInline" IsPaneOpen="True" CompactPaneLength="40" OpenPaneLength="150">
+        
+        <SplitView.Pane>
+            <StackPanel>
+                <Button Content="☰" Click="PaneOpenClose_Click"/>
+                <Button Content="⏱ Zeiterfassung" Click="Zeiterfassung_Click"/>
+                <Button Content="📄 Auswertung"/>
+                <Button Content="⚙ Einstellungen"/>
+            </StackPanel>
+        </SplitView.Pane>
+
+        <SplitView.Content>
+            <ContentControl x:Name="ContentArea" />
+        </SplitView.Content>
+
+    </SplitView>
+</Window>
\ No newline at end of file
diff --git a/ChronoFlow.View/MainWindow.axaml.cs b/ChronoFlow.View/MainWindow.axaml.cs
index 312046d..ebde96a 100644
--- a/ChronoFlow.View/MainWindow.axaml.cs
+++ b/ChronoFlow.View/MainWindow.axaml.cs
@@ -1,11 +1,48 @@
 using Avalonia.Controls;
+using Avalonia.Interactivity;
+using ChronoFlow.Model;
 
 namespace ChronoFlow.View;
 
 public partial class MainWindow : Window
 {
-    public MainWindow()
+    private readonly ViewManager _viewManager;
+    private readonly User _loggedInUser;
+
+    public MainWindow(User user)
     {
         InitializeComponent();
+
+        _loggedInUser = user;
+
+        // ✅ Workaround: Lokale Kopie für Lambda-Nutzung im Register
+        var currentUser = _loggedInUser;
+
+        _viewManager = new ViewManager(ContentArea);
+
+        // ✅ Register-Aufruf mit stabiler local variable
+        _viewManager.Register("Zeiterfassung", () => new ZeiterfassungView(currentUser));
+
+        // Begrüßungsanzeige
+        ContentArea.Content = new TextBlock
+        {
+            Text = $"Willkommen bei ChronoFlow, {currentUser.Username}!",
+            FontSize = 24,
+            HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
+            VerticalAlignment = Avalonia.Layout.VerticalAlignment.Center
+        };
+
+        // Fenstertitel dynamisch setzen
+        this.Title = $"ChronoFlow - Willkommen {currentUser.Username} ({currentUser.Role})";
+    }
+
+    private void PaneOpenClose_Click(object sender, RoutedEventArgs e)
+    {
+        PaneView.IsPaneOpen = !PaneView.IsPaneOpen;
+    }
+
+    private void Zeiterfassung_Click(object? sender, RoutedEventArgs e)
+    {
+        _viewManager.Show("Zeiterfassung");
     }
 }
\ No newline at end of file
diff --git a/ChronoFlow.View/ViewManager.cs b/ChronoFlow.View/ViewManager.cs
new file mode 100644
index 0000000..3d06aff
--- /dev/null
+++ b/ChronoFlow.View/ViewManager.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using Avalonia.Collections;
+using Avalonia.Controls;
+
+namespace ChronoFlow.View
+{
+    ///<summary>
+    /// Verwaltet alle Views der Anwendung und wechselt sie bei Bedarf.
+    /// </summary>
+
+    public class ViewManager
+    {
+        private readonly ContentControl _targetControl;
+        private readonly Dictionary<string, Func<UserControl>> _registieredViews = new();
+
+        public ViewManager(ContentControl targetControl)
+        {
+            _targetControl = targetControl;
+        }
+        
+        ///<summary>
+        /// Registriert eine View mit einem Namen
+        /// </summary>
+
+        public void Show(string name, Func<UserControl> viewFactory)
+        {
+            _registieredViews[name] = viewFactory; 
+        }
+
+        ///<summary>
+        /// Zeigt die View mit dem gegebenen Namen an.
+        /// </summary>
+        public void Show(string name)
+        {
+            if(_registieredViews.TryGetValue(name, out var factory))
+                _targetControl.Content = factory();
+            else
+            {
+                throw new InvalidOperationException($"View {name} is not registered");
+            }
+        }
+        public void Register(string name, Func<UserControl> viewFactory)
+        {
+            _registieredViews[name] = viewFactory;
+        }
+    }
+}
\ No newline at end of file