diff --git a/Jugenddienst Stunden/Interfaces/IHoursRepository.cs b/Jugenddienst Stunden/Interfaces/IHoursRepository.cs
new file mode 100644
index 0000000..c1df1ed
--- /dev/null
+++ b/Jugenddienst Stunden/Interfaces/IHoursRepository.cs	
@@ -0,0 +1,17 @@
+using Jugenddienst_Stunden.Types;
+
+namespace Jugenddienst_Stunden.Interfaces;
+
+/// <summary>
+/// Repository‑Schnittstelle für Datenzugriff (API/Storage) rund um Stunden.
+/// </summary>
+internal interface IHoursRepository {
+    Task<BaseResponse> LoadBase(string query);
+    Task<Settings> LoadSettings();
+    Task<Hours> LoadData();
+    Task<User> LoadUser(string apiKey);
+    Task<List<DayTime>> LoadDay(DateTime date);
+    Task<DayTime> LoadEntry(int id);
+    Task<DayTime> SaveEntry(DayTime stunde);
+    Task DeleteEntry(DayTime stunde);
+}
diff --git a/Jugenddienst Stunden/Interfaces/IHoursService.cs b/Jugenddienst Stunden/Interfaces/IHoursService.cs
new file mode 100644
index 0000000..a24f2bc
--- /dev/null
+++ b/Jugenddienst Stunden/Interfaces/IHoursService.cs	
@@ -0,0 +1,16 @@
+using Jugenddienst_Stunden.Types;
+
+namespace Jugenddienst_Stunden.Interfaces;
+
+/// <summary>
+/// Fachlicher Service für Stunden – konsumiert Repository und stellt VM‑freundliche Methoden bereit.
+/// </summary>
+internal interface IHoursService {
+    Task<(Hours hours, Settings settings)> GetMonthSummaryAsync(DateTime monthDate);
+    Task<(List<DayTime> dayTimes, Settings settings)> GetDayWithSettingsAsync(DateTime date);
+    Task<List<DayTime>> GetDayRangeAsync(DateTime from, DateTime to);
+    Task<Settings> GetSettingsAsync();
+    Task<DayTime> GetEntryAsync(int id);
+    Task<DayTime> SaveEntryAsync(DayTime stunde);
+    Task DeleteEntryAsync(DayTime stunde);
+}
diff --git a/Jugenddienst Stunden/MauiProgram.cs b/Jugenddienst Stunden/MauiProgram.cs
index b8f0b55..b432206 100644
--- a/Jugenddienst Stunden/MauiProgram.cs	
+++ b/Jugenddienst Stunden/MauiProgram.cs	
@@ -1,5 +1,8 @@
 using CommunityToolkit.Maui;
 using Jugenddienst_Stunden.Models;
+using Jugenddienst_Stunden.Interfaces;
+using Jugenddienst_Stunden.Repositories;
+using Jugenddienst_Stunden.Services;
 using Microsoft.Extensions.Logging;
 using ZXing.Net.Maui.Controls;
 
@@ -36,6 +39,10 @@ public static class MauiProgram {
         builder.Logging.AddDebug();
 #endif
 
+        // DI: Services & Repositories
+        builder.Services.AddSingleton<IHoursRepository, HoursRepository>();
+        builder.Services.AddSingleton<IHoursService, HoursService>();
+
         return builder.Build();
     }
 
diff --git a/Jugenddienst Stunden/Repositories/HoursRepository.cs b/Jugenddienst Stunden/Repositories/HoursRepository.cs
new file mode 100644
index 0000000..f3f2f11
--- /dev/null
+++ b/Jugenddienst Stunden/Repositories/HoursRepository.cs	
@@ -0,0 +1,19 @@
+using Jugenddienst_Stunden.Interfaces;
+using Jugenddienst_Stunden.Models;
+using Jugenddienst_Stunden.Types;
+
+namespace Jugenddienst_Stunden.Repositories;
+
+/// <summary>
+/// Standard-Repository, das die bestehende API-/Model-Logik kapselt.
+/// </summary>
+internal class HoursRepository : IHoursRepository {
+    public async Task<BaseResponse> LoadBase(string query) => await HoursBase.LoadBase(query);
+    public async Task<Settings> LoadSettings() => await HoursBase.LoadSettings();
+    public async Task<Hours> LoadData() => await HoursBase.LoadData();
+    public async Task<User> LoadUser(string apiKey) => await HoursBase.LoadUser(apiKey);
+    public async Task<List<DayTime>> LoadDay(DateTime date) => await HoursBase.LoadDay(date);
+    public async Task<DayTime> LoadEntry(int id) => await HoursBase.LoadEntry(id);
+    public async Task<DayTime> SaveEntry(DayTime stunde) => await HoursBase.SaveEntry(stunde);
+    public async Task DeleteEntry(DayTime stunde) => await HoursBase.DeleteEntry(stunde);
+}
diff --git a/Jugenddienst Stunden/Services/HoursService.cs b/Jugenddienst Stunden/Services/HoursService.cs
new file mode 100644
index 0000000..d516ee0
--- /dev/null
+++ b/Jugenddienst Stunden/Services/HoursService.cs	
@@ -0,0 +1,38 @@
+using Jugenddienst_Stunden.Interfaces;
+using Jugenddienst_Stunden.Types;
+
+namespace Jugenddienst_Stunden.Services;
+
+internal class HoursService : IHoursService {
+    private readonly IHoursRepository _repo;
+
+    public HoursService(IHoursRepository repo) {
+        _repo = repo;
+    }
+
+    public async Task<(Hours hours, Settings settings)> GetMonthSummaryAsync(DateTime monthDate) {
+        string q = $"hours&year={monthDate:yyyy}&month={monthDate:MM}";
+        var baseRes = await _repo.LoadBase(q);
+        return (baseRes.hour, baseRes.settings);
+    }
+
+    public async Task<(List<DayTime> dayTimes, Settings settings)> GetDayWithSettingsAsync(DateTime date) {
+        string q = $"date={date:yyyy-MM-dd}";
+        var baseRes = await _repo.LoadBase(q);
+        return (baseRes.daytimes ?? new List<DayTime>(), baseRes.settings);
+    }
+
+    public async Task<List<DayTime>> GetDayRangeAsync(DateTime from, DateTime to) {
+        string q = $"date={from:yyyy-MM-dd}&tilldate={to:yyyy-MM-dd}";
+        var baseRes = await _repo.LoadBase(q);
+        return baseRes.daytimes ?? new List<DayTime>();
+    }
+
+    public async Task<Settings> GetSettingsAsync() => await _repo.LoadSettings();
+
+    public async Task<DayTime> GetEntryAsync(int id) => await _repo.LoadEntry(id);
+
+    public async Task<DayTime> SaveEntryAsync(DayTime stunde) => await _repo.SaveEntry(stunde);
+
+    public async Task DeleteEntryAsync(DayTime stunde) => await _repo.DeleteEntry(stunde);
+}
diff --git a/Jugenddienst Stunden/ViewModels/StundeViewModel.cs b/Jugenddienst Stunden/ViewModels/StundeViewModel.cs
index 82fd06b..d749372 100644
--- a/Jugenddienst Stunden/ViewModels/StundeViewModel.cs	
+++ b/Jugenddienst Stunden/ViewModels/StundeViewModel.cs	
@@ -5,12 +5,16 @@ using Jugenddienst_Stunden.Types;
 using System.ComponentModel;
 using System.Windows.Input;
 using static System.Runtime.InteropServices.JavaScript.JSType;
+using Jugenddienst_Stunden.Interfaces;
+using Jugenddienst_Stunden.Repositories;
+using Jugenddienst_Stunden.Services;
 
 namespace Jugenddienst_Stunden.ViewModels;
 /// <summary>
 /// Viewmodel für die einzelnen Stundeneinträge / Bearbeitung
 /// </summary>
 public partial class StundeViewModel : ObservableObject, IQueryAttributable {
+    private readonly IHoursService _hoursService;
 
     public int Id { get; set; }
     public string Title { get; set; } = "Eintrag bearbeiten";
@@ -76,20 +80,20 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
     //public ICommand LoadDataCommand { get; private set; }
 
 
-    public StundeViewModel() {
+    public StundeViewModel() : this(GetServiceOrCreate()) { }
+
+    private static IHoursService GetServiceOrCreate() => new HoursService(new HoursRepository());
+
+    internal StundeViewModel(IHoursService hoursService) {
+        _hoursService = hoursService;
         SaveCommand = new AsyncRelayCommand(Save);
         //DeleteCommand = new AsyncRelayCommand(Delete);
         DeleteConfirmCommand = new Command(async () => await DeleteConfirm());
     }
 
-    public StundeViewModel(DayTime stunde) {
-        SaveCommand = new AsyncRelayCommand(Save);
-        DeleteConfirmCommand = new AsyncRelayCommand(DeleteConfirm);
-    }
-
     private async void LoadSettingsAsync() {
         try {
-            Settings = await HoursBase.LoadSettings();
+            Settings = await _hoursService.GetSettingsAsync();
             GlobalVar.Settings = Settings;
 
             OptionsGemeinde = Settings.Gemeinden;
@@ -114,7 +118,7 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
       
         if (proceed) {
             try {
-                await HoursBase.SaveEntry(DayTime);
+                await _hoursService.SaveEntryAsync(DayTime);
             } catch (Exception e) {
                 AlertEvent?.Invoke(this, e.Message);
                 exceptionOccurred = true;
@@ -133,7 +137,7 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
     /// Löschen ohne Bestätigung
     /// </summary>
     private async Task Delete() {
-        await HoursBase.DeleteEntry(DayTime);
+        await _hoursService.DeleteEntryAsync(DayTime);
         await Shell.Current.GoToAsync($"..?date={DayTime.Day.ToString("yyyy-MM-dd")}");
     }
 
@@ -145,7 +149,7 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
             bool answer = await ConfirmEvent.Invoke("Achtung", "Löschen kann nicht ungeschehen gemacht werden. Fortfahren?");
             if (answer) {
                 //Löschen
-                await HoursBase.DeleteEntry(DayTime);
+                await _hoursService.DeleteEntryAsync(DayTime);
                 await Shell.Current.GoToAsync($"..?date={DayTime.Day.ToString("yyyy-MM-dd")}");
             } else {
                 //nicht Löschen
@@ -163,27 +167,27 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
 
             //DateTime heute = DateTime.Now;
             try {
-                //_dayTime = await HoursBase.LoadEntry(Convert.ToInt32(query["load"]));
-                BaseResponse dat = await HoursBase.LoadBase("id=" + Convert.ToInt32(query["load"]));
-                GlobalVar.Settings = dat.settings;
-                GemeindeAktivSet = dat.settings.GemeindeAktivSet;
-                ProjektAktivSet = dat.settings.ProjektAktivSet;
+                var entry = await _hoursService.GetEntryAsync(Convert.ToInt32(query["load"]));
+                var settings = await _hoursService.GetSettingsAsync();
+                GlobalVar.Settings = settings;
+                GemeindeAktivSet = settings.GemeindeAktivSet;
+                ProjektAktivSet = settings.ProjektAktivSet;
 
-                DayTime = dat.daytime;
-                DayTime.TimeSpanVon = dat.daytime.Begin.ToTimeSpan();
-                DayTime.TimeSpanBis = dat.daytime.End.ToTimeSpan();
+                DayTime = entry;
+                DayTime.TimeSpanVon = entry.Begin.ToTimeSpan();
+                DayTime.TimeSpanBis = entry.End.ToTimeSpan();
 
-                OptionsGemeinde = dat.settings.Gemeinden ?? new List<Gemeinde>();
-                OptionsProjekt = dat.settings.Projekte ?? new List<Projekt>();
-                OptionsFreistellung = dat.settings.Freistellungen ?? new List<Freistellung>();
+                OptionsGemeinde = settings.Gemeinden ?? new List<Gemeinde>();
+                OptionsProjekt = settings.Projekte ?? new List<Projekt>();
+                OptionsFreistellung = settings.Freistellungen ?? new List<Freistellung>();
 
                 DayTime.GemeindeAktiv = OptionsGemeinde.FirstOrDefault(Gemeinde => Gemeinde.Id == DayTime.Gemeinde) ?? new Gemeinde();
                 DayTime.ProjektAktiv = OptionsProjekt.FirstOrDefault(Projekt => Projekt.Id == DayTime.Projekt) ?? new Projekt();
                 DayTime.FreistellungAktiv = OptionsFreistellung.FirstOrDefault(Freistellung => Freistellung.Id == DayTime.Free) ?? new Freistellung();
 
                 //Evtl. noch die anderen Zeiten des gleichen Tages holen
-                BaseResponse dat1 = await HoursBase.LoadBase("date=" + DayTime.Day.ToString("yyyy-MM-dd"));
-                DayTimes = dat1.daytimes;
+                var day = await _hoursService.GetDayWithSettingsAsync(DayTime.Day);
+                DayTimes = day.dayTimes;
                 OnPropertyChanged(nameof(DayTime));
                 OnPropertyChanged(nameof(DayTimes));
 
@@ -209,17 +213,16 @@ public partial class StundeViewModel : ObservableObject, IQueryAttributable {
             DateTime _date = DateTime.ParseExact((string)query["date"], "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
             //Bei neuem Eintrag die vorhandenen des gleichen Tages anzeigen
             try {
-                //DayTimes = await HoursBase.LoadDay(_date);
-                BaseResponse dat = await HoursBase.LoadBase("date=" + _date.ToString("yyyy-MM-dd"));
-                GlobalVar.Settings = dat.settings;
-                DayTimes = dat.daytimes;
+                var (list, settings) = await _hoursService.GetDayWithSettingsAsync(_date);
+                GlobalVar.Settings = settings;
+                DayTimes = list;
 
-                OptionsGemeinde = dat.settings.Gemeinden;
-                OptionsProjekt = dat.settings.Projekte;
-                OptionsFreistellung = dat.settings.Freistellungen;
+                OptionsGemeinde = settings.Gemeinden;
+                OptionsProjekt = settings.Projekte;
+                OptionsFreistellung = settings.Freistellungen;
 
-                GemeindeAktivSet = dat.settings.GemeindeAktivSet;
-                ProjektAktivSet = dat.settings.ProjektAktivSet;
+                GemeindeAktivSet = settings.GemeindeAktivSet;
+                ProjektAktivSet = settings.ProjektAktivSet;
 
             } catch (Exception) {
                 //Ein Tag ohne Einträge gibt eine Fehlermeldung,
diff --git a/Jugenddienst Stunden/ViewModels/StundenViewModel.cs b/Jugenddienst Stunden/ViewModels/StundenViewModel.cs
index 315ce1e..415c4ea 100644
--- a/Jugenddienst Stunden/ViewModels/StundenViewModel.cs	
+++ b/Jugenddienst Stunden/ViewModels/StundenViewModel.cs	
@@ -8,6 +8,9 @@ using System.Windows.Input;
 using CommunityToolkit.Maui.Alerts;
 using CommunityToolkit.Maui.Core;
 using static System.Runtime.InteropServices.JavaScript.JSType;
+using Jugenddienst_Stunden.Interfaces;
+using Jugenddienst_Stunden.Repositories;
+using Jugenddienst_Stunden.Services;
 
 
 namespace Jugenddienst_Stunden.ViewModels;
@@ -15,6 +18,7 @@ namespace Jugenddienst_Stunden.ViewModels;
 /// ViewModel für die Stundenliste
 /// </summary>
 internal partial class StundenViewModel : ObservableObject, IQueryAttributable, INotifyPropertyChanged {
+    private readonly IHoursService _hoursService;
 
     public ICommand NewEntryCommand { get; }
     public ICommand SelectEntryCommand { get; }
@@ -156,7 +160,13 @@ internal partial class StundenViewModel : ObservableObject, IQueryAttributable,
     /// <summary>
     /// CTOR
     /// </summary>
-    public StundenViewModel() {
+    public StundenViewModel() : this(GetServiceOrCreate()) {
+    }
+
+    private static IHoursService GetServiceOrCreate() => new HoursService(new HoursRepository());
+
+    internal StundenViewModel(IHoursService hoursService) {
+        _hoursService = hoursService;
         Hours = new Hours();
 
         LoadOverview = "Lade Summen für " + DateToday.ToString("MMMM");
@@ -200,9 +210,9 @@ internal partial class StundenViewModel : ObservableObject, IQueryAttributable,
     /// </summary>
     private async Task LoadData() {
         try {
-            BaseResponse dat = await HoursBase.LoadBase("hours&year=" + DateToday.ToString("yyyy") + "&month=" + DateToday.ToString("MM"));
-            Hours = dat.hour;
-            Settings = dat.settings;
+            var (hours, settings) = await _hoursService.GetMonthSummaryAsync(DateToday);
+            Hours = hours;
+            Settings = settings;
 
             if (Settings.Version != AppInfo.Current.VersionString.Substring(0, 5)) {
                 InfoEvent?.Invoke(this, "Version: " + Settings.Version + " verfügbar (" + AppInfo.Current.VersionString.Substring(0, 5) + " installiert)");
@@ -222,11 +232,10 @@ internal partial class StundenViewModel : ObservableObject, IQueryAttributable,
         DayTotal = new TimeOnly(0);
         Sollstunden = new TimeOnly(0);
         try {
-            //_dayTimes = await HoursBase.LoadDay(date);
-            BaseResponse dat = await HoursBase.LoadBase("date=" + date.ToString("yyyy-MM-dd"));
+            var (dayTimes, settings) = await _hoursService.GetDayWithSettingsAsync(date);
 
-            DayTimes = dat.daytimes;
-            Settings = dat.settings;
+            DayTimes = dayTimes;
+            Settings = settings;
             GemeindeAktivSet = Settings.GemeindeAktivSet;
             ProjektAktivSet = Settings.ProjektAktivSet;
 
@@ -251,9 +260,9 @@ internal partial class StundenViewModel : ObservableObject, IQueryAttributable,
 
             //Nach der Tagessumme die anderen Tage anhängen
             if (DayTimes != null) {
-                BaseResponse dat1 = await HoursBase.LoadBase("date=" + date.ToString("yyyy-MM-dd") + "&tilldate=" + date.AddDays(3).ToString("yyyy-MM-dd"));
-                if (dat1.daytimes != null)
-                    DayTimes = dat.daytimes.Concat(dat1.daytimes).ToList();
+                var more = await _hoursService.GetDayRangeAsync(date, date.AddDays(3));
+                if (more != null && more.Count > 0)
+                    DayTimes = DayTimes.Concat(more).ToList();
             }
 
         } catch (Exception e) {