diff --git a/be/app/Http/Controllers/MasterTaskController.php b/be/app/Http/Controllers/MasterTaskController.php
new file mode 100644
index 0000000..b270558
--- /dev/null
+++ b/be/app/Http/Controllers/MasterTaskController.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\MasterTask;
+use App\Models\Team;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
+
+class MasterTaskController extends Controller
+{
+    public function store(Request $request)
+    {
+        $validator = Validator::make($request->all(), [
+            'data.name' => 'required',
+            'data.description' => 'required',
+            'data.duration' => 'required',
+            'data.deadline' => 'required',
+            'data.project_id' => 'required',
+        ]);
+
+        if($validator->fails()){
+            return response()->json($validator->errors(), 400);
+        }
+
+        // upratanie requestu, pretoze frontend pouziva inu nomenklaturu fieldov ako appka
+        $data['data'] = $request->all()['data'];
+        $data['data']['title'] = $request->all()['data']['name'];
+        $data['data']['estimated_time'] = $request->all()['data']['duration'];
+
+
+        foreach ( $data['data']['employees'] as $key => $employee ) {
+            $data['data']['employees'][$key]['user_id'] = $employee['id'];
+            $data['data']['employees'][$key]['estimated_time'] = $employee['duration'];
+        }
+
+        $request->merge($data);
+
+        $mastertask = MasterTask::create($request->all()['data']);
+        $mastertask->subtasks()->createMany($request->all()['data']['employees']);
+
+        return response()->json([
+            'message' => 'Master Task created successfully',
+            'mastertask' => $mastertask
+        ], 201);
+    }
+
+    public function delete($id)
+    {
+        $mastertask = MasterTask::find($id);
+
+        // nedovolit zmazanie mastertasku, ak existuje aspon jeden subtask s timesheetom
+        foreach ($mastertask->subtasks as $subtask) {
+            if ($subtask->timesheets()->exists()) {
+                return response()->json([
+                    'message' => 'Cannot delete subtask with submitted timesheets.',
+                ], 400);
+            }
+        }
+
+        $mastertask->attachments()->delete();
+
+        foreach ( $mastertask->subtasks as $subtask ) {
+            $subtask->timeblocks()->delete();
+        }
+
+        $mastertask->subtasks()->delete();
+
+        $mastertask->delete();
+
+        return response()->json([
+            'message' => 'Master Task deleted successfully.',
+            'mastertask' => $mastertask
+        ]);
+    }
+
+}
diff --git a/be/app/Http/Controllers/SubTaskController.php b/be/app/Http/Controllers/SubTaskController.php
new file mode 100644
index 0000000..df5e701
--- /dev/null
+++ b/be/app/Http/Controllers/SubTaskController.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\MasterTask;
+use App\Models\SubTask;
+use App\Models\Team;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
+
+class SubTaskController extends Controller
+{
+    public function store($mastertask_id, Request $request)
+    {
+        $validator = Validator::make($request->all(), [
+            'data.employee_id' => 'required',
+            'data.duration' => 'required',
+        ]);
+
+        // validacia, ci uz subtask pre tohto usera a mastertask neexistuje
+        $validator->after(function ($validator) use ($mastertask_id, $request) {
+            if (SubTask::where('master_task_id', $mastertask_id)->where('user_id', $request->all()['data']['employee_id'])->exists()) {
+                $validator->errors()->add(
+                    'data.employee_id', 'Sub task already exists for this employee and master task.'
+                );
+            }
+        });
+
+        if($validator->fails()){
+            return response()->json($validator->errors(), 400);
+        }
+
+        // upratanie requestu, pretoze frontend pouziva inu nomenklaturu fieldov ako appka
+        $data['data'] = $request->all()['data'];
+        $data['data']['user_id'] = $request->all()['data']['employee_id'];
+        $data['data']['estimated_time'] = $request->all()['data']['duration'];
+
+        $request->merge($data);
+
+        $mastertask = MasterTask::find($mastertask_id);
+        $subtask = $mastertask->subtasks()->create($request->all()['data']);
+
+        return response()->json([
+            'message' => 'Sub Task created successfully',
+            'subtask' => $subtask
+        ], 201);
+    }
+
+    public function delete($id)
+    {
+        $subtask = SubTask::find($id);
+
+        // ak existuje timesheet k subtasku, nemoze sa zmazat
+        if ($subtask->timesheets()->exists()) {
+            return response()->json([
+                'message' => 'Cannot delete subtask with submitted timesheets.',
+            ], 400);
+        }
+
+        $subtask->timeblocks()->delete();
+
+        // TODO budu mat attachmenty?
+        // $subtask->attachments()->delete();
+        $subtask->delete();
+
+        return response()->json([
+            'message' => 'Subtask deleted successfully.',
+            'subtask' => $subtask
+        ]);
+    }
+}
diff --git a/be/app/Http/Controllers/TeamController.php b/be/app/Http/Controllers/TeamController.php
index e4498d5..1dffff1 100644
--- a/be/app/Http/Controllers/TeamController.php
+++ b/be/app/Http/Controllers/TeamController.php
@@ -65,7 +65,7 @@ class TeamController extends Controller
         return response()->json([
             'message' => 'Team deleted successfully',
             'team' => $team
-        ], 201);
+        ]);
     }
 
     /**
diff --git a/be/app/Http/Resources/SubTaskCollection.php b/be/app/Http/Resources/SubTaskCollection.php
new file mode 100644
index 0000000..143fd24
--- /dev/null
+++ b/be/app/Http/Resources/SubTaskCollection.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Resources\Json\ResourceCollection;
+
+class SubTaskCollection extends ResourceCollection
+{
+    /**
+     * Transform the resource collection into an array.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
+     */
+
+
+    public function toArray($request)
+    {
+        return [
+            'data' => $this->collection,
+            'status' => 200,
+        ];
+    }
+
+}
diff --git a/be/app/Http/Resources/SubTaskResource.php b/be/app/Http/Resources/SubTaskResource.php
index 68a7838..62f5b8b 100644
--- a/be/app/Http/Resources/SubTaskResource.php
+++ b/be/app/Http/Resources/SubTaskResource.php
@@ -27,6 +27,7 @@ class SubTaskResource extends JsonResource
             'spent_time' => $this->tracked_time,
             'is_finished' => $this->is_finished,
             'timeblocks' => TimeblockResource::collection($this->timeblocks),
+            'timesheets' => TimesheetResource::collection($this->timesheets),
         ];
 
     }
diff --git a/be/app/Http/Resources/TimesheetResource.php b/be/app/Http/Resources/TimesheetResource.php
new file mode 100644
index 0000000..7cd461d
--- /dev/null
+++ b/be/app/Http/Resources/TimesheetResource.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class TimesheetResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return array|\Illuminate\Contracts\Support\Arrayable|\JsonSerializable
+     */
+    public function toArray($request)
+    {
+        return [
+            'id' => $this->id,
+            'employee_id' => $this->user_id,
+            'time' => $this->time,
+        ];
+
+    }
+}
diff --git a/be/app/Models/MasterTask.php b/be/app/Models/MasterTask.php
index cdd6466..1b496cd 100644
--- a/be/app/Models/MasterTask.php
+++ b/be/app/Models/MasterTask.php
@@ -10,6 +10,7 @@ class MasterTask extends Model
     use HasFactory;
 
     public $timestamps = true;
+    public $guarded = ['id'];
 
     public function subtasks()
     {
@@ -40,4 +41,11 @@ class MasterTask extends Model
             return !in_array($this->team->id, $user->teams->pluck('id')->unique()->toArray());
         });
     }
+
+    // TODO dorobit logiku
+    public static function generateMasterTaskColor()
+    {
+        // return random value from array
+        return collect(['#E9FFE5', '#F6ECD3', '#FDE1FF', '#FFC9C9', '#DADEF8', '#EDFFFE'])->random();
+    }
 }
diff --git a/be/app/Models/SubTask.php b/be/app/Models/SubTask.php
index a2ffa16..a5d02be 100644
--- a/be/app/Models/SubTask.php
+++ b/be/app/Models/SubTask.php
@@ -10,6 +10,7 @@ class SubTask extends Model
     use HasFactory;
 
     public $timestamps = true;
+    public $guarded = ['id'];
 
     public function mastertask()
     {
diff --git a/be/app/Observers/MasterTaskObserver.php b/be/app/Observers/MasterTaskObserver.php
new file mode 100644
index 0000000..fd73dc9
--- /dev/null
+++ b/be/app/Observers/MasterTaskObserver.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\MasterTask;
+
+class MasterTaskObserver
+{
+    public function creating(MasterTask $mastertask)
+    {
+        $mastertask->color = MasterTask::generateMasterTaskColor();
+    }
+}
diff --git a/be/app/Providers/MasterTaskServiceProvider.php b/be/app/Providers/MasterTaskServiceProvider.php
new file mode 100644
index 0000000..765da5b
--- /dev/null
+++ b/be/app/Providers/MasterTaskServiceProvider.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Providers;
+
+use App\Models\MasterTask;
+use App\Observers\MasterTaskObserver;
+use Illuminate\Support\ServiceProvider;
+
+class MasterTaskServiceProvider extends ServiceProvider
+{
+    /**
+     * Register services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+    }
+
+    /**
+     * Bootstrap services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        MasterTask::observe( MasterTaskObserver::class);
+    }
+}
diff --git a/be/config/app.php b/be/config/app.php
index ef76a7e..d10a5ec 100644
--- a/be/config/app.php
+++ b/be/config/app.php
@@ -194,6 +194,7 @@ return [
         // App\Providers\BroadcastServiceProvider::class,
         App\Providers\EventServiceProvider::class,
         App\Providers\RouteServiceProvider::class,
+        App\Providers\MasterTaskServiceProvider::class,
 
     ],
 
diff --git a/be/routes/api.php b/be/routes/api.php
index 23f8859..0b47b4c 100644
--- a/be/routes/api.php
+++ b/be/routes/api.php
@@ -1,17 +1,21 @@
 <?php
 
 use App\Http\Controllers\MasterTaskController;
+use App\Http\Controllers\SubTaskController;
 use App\Http\Controllers\TeamController;
 use App\Http\Controllers\UserController;
 use App\Http\Resources\MasterTaskCollection;
 use App\Http\Resources\MasterTaskResource;
 use App\Http\Resources\ProjectCollection;
+use App\Http\Resources\SubTaskCollection;
+use App\Http\Resources\SubTaskResource;
 use App\Http\Resources\TeamCollection;
 use App\Http\Resources\TeamResource;
 use App\Http\Resources\UserCollection;
 use App\Http\Resources\UserResource;
 use App\Models\MasterTask;
 use App\Models\Project;
+use App\Models\SubTask;
 use App\Models\Team;
 use App\Models\User;
 use Illuminate\Support\Facades\Route;
@@ -55,10 +59,37 @@ Route::get('/v1/projects', function () {
 Route::get('/v1/mastertasks', function () {
     return new MasterTaskCollection( MasterTask::all());
 });
-Route::post('/v1/mastertasks', MasterTaskController::class . '@store');
 
 Route::get('/v1/mastertasks/{id}', function ($id) {
     return new MasterTaskResource( MasterTask::find($id));
 });
 
 
+Route::post('/v1/mastertasks', MasterTaskController::class . '@store');
+Route::delete('/v1/mastertasks/{id}', MasterTaskController::class . '@delete');
+
+Route::get('/v1/mastertasks/{id}/subtasks', function ($id) {
+    return new SubTaskCollection( SubTask::whereHas('mastertask', function ($query) use ($id) {
+        $query->where('id', $id);
+    })->get());
+});
+
+Route::post('/v1/mastertasks/{id}/subtasks', SubTaskController::class . '@store');
+
+
+
+Route::get('/v1/subtasks/{id}', function ($id) {
+    return new SubTaskResource( SubTask::find($id));
+});
+Route::delete('/v1/subtasks/{id}', SubTaskController::class . '@delete');
+
+
+//Route::post('/v1/subtasks/{id}/timesheet', function () {
+//    return new MasterTaskResource( SubTaskController::class . '@storeTimesheet');
+//});
+//
+//Route::delete('/v1/subtasks/{id}/timesheet/{}', function () {
+//    return new MasterTaskResource( SubTaskController::class . '@storeTimesheet');
+//});
+
+