diff --git a/StempelClient/MainWindow.xaml b/StempelClient/MainWindow.xaml
index 7a05d8b..36d7eb1 100644
--- a/StempelClient/MainWindow.xaml
+++ b/StempelClient/MainWindow.xaml
@@ -5,8 +5,59 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:StempelClient"
         mc:Ignorable="d"
-        Title="MainWindow" Height="450" Width="800">
-    <Grid>
+        Title="MainWindow" Height="450" Width="800"
+    KeyDown="Window_KeyDown">
+    <Grid Margin="10" Background="LightGray">
+        <!-- Zwei Zeilen: Die erste für das Textfeld und das Label, die zweite für die Buchstaben-Buttons -->
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- Zeile 0: Textfeld und Label "Kürzel" -->
+        <StackPanel Grid.Row="0" Orientation="Horizontal" HorizontalAlignment="Center" Margin="0,10,0,20">
+            <Label FontWeight="Bold" FontSize="12" Content="Kürzel" VerticalAlignment="Center" Margin="0,0,10,0" Width="50" Height="30"/>
+            <TextBox x:Name="KuerzelTextBox" Width="200" Height="25" TextChanged="TextBox_TextChanged" BorderThickness="2" Background="White"/>
+        </StackPanel>
+
+        <!-- Zeile 1: Buttons von A-Z in einem WrapPanel mit fester Breite -->
+        <WrapPanel x:Name="PinButtonsPanel"
+               Grid.Row="1"
+               HorizontalAlignment="Center"
+               VerticalAlignment="Top"
+               Margin="50,20,0,0"
+               Width="170">
+            <Button Content="A" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="B" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="C" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="D" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="E" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="F" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="G" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="H" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="I" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="J" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="K" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="L" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="M" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="N" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="O" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="P" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="Q" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="R" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="S" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="T" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="U" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="V" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="W" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="X" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="Y" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+            <Button Content="Z" Width="30" Height="30" Margin="2" Background="White" Click="LetterButton_Click"/>
+
+            <!-- Neuer Enter-Button -->
+            <Button x:Name="EnterButton" Content="↵" Width="132" Height="30" Margin="2" Background="LightGreen" Click="EnterButton_Click"/>
+        </WrapPanel>
+
 
     </Grid>
 </Window>
diff --git a/StempelClient/MainWindow.xaml.cs b/StempelClient/MainWindow.xaml.cs
index 6939a90..e0cfcb6 100644
--- a/StempelClient/MainWindow.xaml.cs
+++ b/StempelClient/MainWindow.xaml.cs
@@ -8,6 +8,7 @@ using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
+using System.Linq;
 
 namespace StempelClient;
 
@@ -16,8 +17,174 @@ namespace StempelClient;
 /// </summary>
 public partial class MainWindow : Window
 {
+    #region MitarbeiterArray
+    private string[] Mitarbeiter = new string[6]
+    {
+           "Tim Grafe", "Julian Kotthoff", "Laurenz Appel", "David Oppermann", "Isaiah Trox", "Joline Elizabeth Panagiotaris"
+    };
+
+    private Dictionary<string, string> MitarbeiterMapping;
+    #endregion
+
+    #region Main
     public MainWindow()
     {
         InitializeComponent();
+        // Verwende das PIN-Array aus der PinPanel-Klasse zum Erstellen des Mappings.
+        MitarbeiterMapping = Mitarbeiter.Zip(PinPanel.MitarbeiterPin, (name, pin) => new { name, pin })
+                                        .ToDictionary(x => x.name, x => x.pin);
+        // Das Eingabefeld "Kürzel" bleibt zunächst leer.
     }
+    #endregion
+
+    #region Kürzel aus Namen generieren
+    private string AutoFillKuerzel(string fullName)
+    {
+        if (string.IsNullOrWhiteSpace(fullName))
+            return string.Empty;
+
+        var parts = fullName.Split(' ', System.StringSplitOptions.RemoveEmptyEntries);
+        string initials = string.Empty;
+        if (parts.Length >= 1 && parts[0].Length > 0)
+            initials += parts[0][0];
+        if (parts.Length >= 2 && parts[1].Length > 0)
+            initials += parts[1][0];
+        if (parts.Length >= 3 && parts[2].Length > 0)
+            initials += parts[2][0];
+
+        return initials.ToUpper();
+    }
+    #endregion
+
+    #region LetterButtonClickFunction
+    private async void LetterButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (sender is Button btn)
+        {
+            if (!btn.Background.Equals(Brushes.Gray))
+            {
+                var originalBackground = btn.Background;
+                btn.Background = Brushes.Gray;
+                await Task.Delay(50);
+                btn.Background = originalBackground;
+            }
+            string letter = btn.Content.ToString().ToUpper();
+            if (KuerzelTextBox != null)
+            {
+                if (KuerzelTextBox.Text.Length < 3)
+                {
+                    KuerzelTextBox.Text += letter;
+                }
+                else if (letter != "↵")
+                {
+                    MessageBox.Show("Fehler: Es dürfen nur drei Buchstaben eingegeben werden!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                }
+            }
+        }
+    }
+    #endregion
+
+    #region EnterButtonFunction
+    private void EnterButton_Click(object sender, RoutedEventArgs e)
+    {
+        if (string.IsNullOrWhiteSpace(KuerzelTextBox.Text))
+        {
+            MessageBox.Show("Fehler: Bitte geben Sie ein Kürzel ein!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+            return;
+        }
+
+        string eingabe = KuerzelTextBox.Text.ToUpper();
+        string matchedEmployee = null;
+        foreach (var mitarbeiter in Mitarbeiter)
+        {
+            string kurz = AutoFillKuerzel(mitarbeiter);
+            if (kurz == eingabe)
+            {
+                matchedEmployee = mitarbeiter;
+                break;
+            }
+        }
+
+        if (matchedEmployee == null)
+        {
+            MessageBox.Show("Fehler: Das eingetippte Kürzel stimmt mit keinem Mitarbeiter überein!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+        }
+        else
+        {
+            // Erwartete PIN aus der Mapping holen und in int umwandeln
+            string expectedPinStr = MitarbeiterMapping[matchedEmployee];
+            if (!int.TryParse(expectedPinStr, out int expectedPin))
+            {
+                MessageBox.Show("Fehler: Die PIN des Mitarbeiters ist ungültig!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                return;
+            }
+
+            // Erstelle eine Instanz des PinPanel und weise die erwartete PIN zu
+            PinPanel pinPage = new PinPanel();
+            pinPage.ExpectedPin = expectedPin;
+
+            NavigationWindow navWindow = new NavigationWindow();
+            navWindow.Navigate(pinPage);
+            navWindow.Title = "Pin Eingabe";
+            navWindow.Show();
+            this.Close();
+        }
+    }
+    #endregion
+
+    #region WindowKeyDownFunction
+    private void Window_KeyDown(object sender, KeyEventArgs e)
+    {
+        if (e.Key == Key.Enter)
+        {
+            EnterButton_Click(EnterButton, new RoutedEventArgs());
+            return;
+        }
+
+        var keyStr = e.Key.ToString().ToUpper();
+        if (keyStr.Length == 1 && char.IsLetter(keyStr[0]))
+        {
+            foreach (var child in PinButtonsPanel.Children)
+            {
+                if (child is Button btn && btn.Content.ToString().ToUpper() == keyStr)
+                {
+                    LetterButton_Click(btn, new RoutedEventArgs());
+                    break;
+                }
+            }
+        }
+
+        if (e.Key == Key.Back)
+        {
+            KuerzelTextBox.Clear();
+            return;
+        }
+        if (e.Key == Key.Escape)
+        {
+            Application.Current.Shutdown();
+            return;
+        }
+    }
+    #endregion
+
+    #region TextBoxFunction
+    private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
+    {
+        if (sender is TextBox tb)
+        {
+            string text = tb.Text.ToUpper();
+            if (text != tb.Text)
+            {
+                tb.Text = text;
+                tb.CaretIndex = tb.Text.Length;
+            }
+            if (text.Length > 3)
+            {
+                MessageBox.Show("Fehler: Es dürfen nur drei Buchstaben eingegeben werden!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                tb.Text = text.Substring(0, 3);
+                tb.CaretIndex = tb.Text.Length;
+            }
+        }
+    }
+    #endregion
 }
\ No newline at end of file
diff --git a/StempelClient/PinPanel.xaml b/StempelClient/PinPanel.xaml
new file mode 100644
index 0000000..9c158fc
--- /dev/null
+++ b/StempelClient/PinPanel.xaml
@@ -0,0 +1,48 @@
+<Page x:Class="StempelClient.PinPanel"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:StempelClient"
+        mc:Ignorable="d"
+        Title="PinPanel" Height = "450" Width = "800"
+        KeyDown="Page_KeyDown"
+        Loaded="Page_Loaded"
+        Focusable="True">
+    <Grid Margin="10" Background="LightGray">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- Zeile 0: Label und TextBox für die PIN -->
+        <StackPanel Grid.Row="0" Orientation="Horizontal" HorizontalAlignment="Center" Margin="0,10,0,20">
+            <Label FontWeight="Bold" FontSize="14" Content="PIN" VerticalAlignment="Center" Margin="0,0,10,0" Width="50" Height="30"/>
+            <TextBox x:Name="PinTextBox" Width="200" Height="30" TextChanged="PinTextBox_TextChanged" BorderThickness="2" Background="White"/>
+        </StackPanel>
+
+        <!-- Zeile 1: Nummern-Buttons in einem UniformGrid -->
+        <UniformGrid Grid.Row="1" Columns="3" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="20">
+            <!-- Erste Zeile -->
+            <Button Content="1" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="2" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="3" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+
+            <!-- Zweite Zeile -->
+            <Button Content="4" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="5" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="6" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+
+            <!-- Dritte Zeile -->
+            <Button Content="7" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="8" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <Button Content="9" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+
+            <!-- Vierte Zeile -->
+            <Button x:Name="PinEnterButton" Content="↵" Width="50" Height="50" Margin="5" Background="LightGreen" Click="PinEnterButton_Click"/>
+            <Button Content="0" Width="50" Height="50" Margin="5" Background="White" Click="PinButton_Click"/>
+            <!-- Leerer Platzhalter -->
+            <Button Content="" Width="50" Height="50" Margin="5" Visibility="Hidden" IsEnabled="False"/>
+        </UniformGrid>
+    </Grid>
+</Page>
diff --git a/StempelClient/PinPanel.xaml.cs b/StempelClient/PinPanel.xaml.cs
new file mode 100644
index 0000000..08f2207
--- /dev/null
+++ b/StempelClient/PinPanel.xaml.cs
@@ -0,0 +1,184 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace StempelClient
+{
+    /// <summary>
+    /// Interaktionslogik für PinPanel.xaml
+    /// </summary>
+    public partial class PinPanel : Page
+    {
+
+        #region InitializeComponent
+        public PinPanel()
+        {
+            InitializeComponent();
+        }
+        #endregion
+
+        #region Pin-Array
+        public static readonly string[] MitarbeiterPin = new string[6]
+        {
+           "11111", "11111", "11111", "11111", "11111", "11111"
+        };
+        #endregion
+
+        #region PinExpected
+        public int ExpectedPin { get; set; }
+        #endregion
+
+        #region Page Loader
+        private void Page_Loaded(object sender, RoutedEventArgs e)
+        {
+            this.Focus(); // Setzt den Fokus auf die Seite, damit Tastatureingaben verarbeitet werden.
+        }
+        #endregion
+
+        #region DigitButtonClickFunction
+        private async void PinButton_Click(object sender, RoutedEventArgs e)
+        {
+            if (sender is Button btn)
+            {
+                if (!btn.Background.Equals(Brushes.Gray))
+                {
+                    var originalBackground = btn.Background;
+                    btn.Background = Brushes.Gray;
+                    await Task.Delay(50);
+                    btn.Background = originalBackground;
+                }
+
+                string buttonContent = btn.Content.ToString();
+                if (buttonContent != "↵")
+                {
+                    if (PinTextBox.Text.Length < 5)
+                    {
+                        PinTextBox.Text += buttonContent;
+                    }
+                    else
+                    {
+                        MessageBox.Show("Fehler: Es dürfen nur 5 Ziffern eingegeben werden!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                    }
+                }
+            }
+        }
+        #endregion
+
+        #region EnterButtonFunction
+        private void PinEnterButton_Click(object sender, RoutedEventArgs e)
+        {
+            if (string.IsNullOrWhiteSpace(PinTextBox.Text))
+            {
+                MessageBox.Show("Fehler: Bitte geben Sie einen PIN ein!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                return;
+            }
+            if (PinTextBox.Text.Length != 5)
+            {
+                MessageBox.Show("Fehler: Der PIN muss 5 Ziffern lang sein!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                return;
+            }
+            if (int.TryParse(PinTextBox.Text, out int enteredPin))
+            {
+                if (enteredPin == ExpectedPin)
+                {
+                    MessageBox.Show("PIN akzeptiert. Login erfolgreich!", "Erfolg", MessageBoxButton.OK, MessageBoxImage.Information);
+                    // Nächste Logik zur Navigation kann hier hinzugefügt werden.
+                }
+                else
+                {
+                    MessageBox.Show("Fehler: Der eingegebene PIN ist falsch!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                }
+            }
+            else
+            {
+                MessageBox.Show("Fehler: Ungültige PIN!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+        }
+        #endregion
+
+        #region TextBoxFunction
+        private void PinTextBox_TextChanged(object sender, TextChangedEventArgs e)
+        {
+            if (sender is TextBox tb)
+            {
+                string newText = "";
+                foreach (char c in tb.Text)
+                {
+                    if (char.IsDigit(c))
+                        newText += c;
+                }
+                if (newText != tb.Text)
+                {
+                    tb.Text = newText;
+                    tb.CaretIndex = tb.Text.Length;
+                }
+                if (tb.Text.Length > 5)
+                {
+                    MessageBox.Show("Fehler: Es dürfen nur 5 Ziffern eingegeben werden!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                    tb.Text = tb.Text.Substring(0, 5);
+                    tb.CaretIndex = tb.Text.Length;
+                }
+            }
+        }
+        #endregion
+
+        #region ProcessNumericInputFunction
+        private void ProcessNumericInput(Key key)
+        {
+            string digit = string.Empty;
+            if (key >= Key.D0 && key <= Key.D9)
+                digit = (key - Key.D0).ToString();
+            else if (key >= Key.NumPad0 && key <= Key.NumPad9)
+                digit = (key - Key.NumPad0).ToString();
+
+            if (!string.IsNullOrEmpty(digit))
+            {
+                if (PinTextBox.Text.Length < 5)
+                {
+                    PinTextBox.Text += digit;
+                }
+                else
+                {
+                    MessageBox.Show("Fehler: Es dürfen nur 5 Ziffern eingegeben werden!", "Eingabefehler", MessageBoxButton.OK, MessageBoxImage.Error);
+                }
+            }
+        }
+        #endregion
+
+        #region PageKeyDownFunction
+        private void Page_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Enter)
+            {
+                PinEnterButton_Click(PinEnterButton, new RoutedEventArgs());
+                return;
+            }
+            if ((e.Key >= Key.D0 && e.Key <= Key.D9) || (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9))
+            {
+                ProcessNumericInput(e.Key);
+                return;
+            }
+            if (e.Key == Key.Back)
+            {
+                PinTextBox.Clear();
+                return;
+            }
+            if (e.Key == Key.Escape)
+            {
+                Application.Current.Shutdown();
+                return;
+            }
+        }
+        #endregion
+    }
+}