diff --git a/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java b/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java
index 0b385f1..0aab2cb 100644
--- a/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java
+++ b/backend/src/main/java/de/szut/casino/blackjack/BlackJackGameController.java
@@ -2,11 +2,9 @@ package de.szut.casino.blackjack;
 
 import de.szut.casino.blackjack.dto.CreateBlackJackGameDto;
 import de.szut.casino.user.UserEntity;
-import de.szut.casino.user.UserRepository;
 import de.szut.casino.user.UserService;
 import jakarta.validation.Valid;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
@@ -24,14 +22,10 @@ public class BlackJackGameController {
 
     private final UserService userService;
     private final BlackJackService blackJackService;
-    private final BlackJackGameRepository blackJackGameRepository;
-    private final UserRepository userRepository;
 
-    public BlackJackGameController(UserService userService, BlackJackService blackJackService, BlackJackGameRepository blackJackGameRepository, UserRepository userRepository) {
-        this.userService = userService;
+    public BlackJackGameController(UserService userService, BlackJackService blackJackService) {
         this.blackJackService = blackJackService;
-        this.blackJackGameRepository = blackJackGameRepository;
-        this.userRepository = userRepository;
+        this.userService = userService;
     }
 
     @PostMapping("/blackjack/start")
@@ -58,23 +52,6 @@ public class BlackJackGameController {
             return ResponseEntity.badRequest().body(errorResponse);
         }
 
-        BlackJackGameEntity game = new BlackJackGameEntity();
-        game.setUser(user);
-        game.setBet(betAmount);
-
-        for (int i = 0; i < 2; i++) {
-            CardEntity playerCard = blackJackService.createRandomCard(game);
-            game.getPlayerCards().add(playerCard);
-        }
-
-        CardEntity dealerCard = blackJackService.createRandomCard(game);
-        game.getDealerCards().add(dealerCard);
-
-        user.setBalance(user.getBalance().subtract(betAmount));
-
-        userRepository.save(user);
-        blackJackGameRepository.save(game);
-
-        return ResponseEntity.ok(game);
+        return ResponseEntity.ok(blackJackService.createBlackJackGame(user, betAmount));
     }
 }
diff --git a/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java b/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
index 8defe57..ba5e7d1 100644
--- a/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
+++ b/backend/src/main/java/de/szut/casino/blackjack/BlackJackService.java
@@ -1,13 +1,46 @@
 package de.szut.casino.blackjack;
 
+import de.szut.casino.user.UserEntity;
+import de.szut.casino.user.UserRepository;
 import org.springframework.stereotype.Service;
+
+import java.math.BigDecimal;
 import java.util.Random;
 
 @Service
 public class BlackJackService {
+    private final BlackJackGameRepository blackJackGameRepository;
+    private final UserRepository userRepository;
+
+    public BlackJackService(BlackJackGameRepository blackJackGameRepository, UserRepository userRepository) {
+        this.blackJackGameRepository = blackJackGameRepository;
+        this.userRepository = userRepository;
+    }
+
     private final Random random = new Random();
 
-    public CardEntity createRandomCard(BlackJackGameEntity game) {
+    public BlackJackGameEntity createBlackJackGame(UserEntity user, BigDecimal betAmount) {
+        BlackJackGameEntity game = new BlackJackGameEntity();
+        game.setUser(user);
+        game.setBet(betAmount);
+
+        for (int i = 0; i < 2; i++) {
+            CardEntity playerCard = createRandomCard(game);
+            game.getPlayerCards().add(playerCard);
+        }
+
+        CardEntity dealerCard = createRandomCard(game);
+        game.getDealerCards().add(dealerCard);
+
+        user.setBalance(user.getBalance().subtract(betAmount));
+
+        userRepository.save(user);
+        blackJackGameRepository.save(game);
+
+        return game;
+    }
+
+    private CardEntity createRandomCard(BlackJackGameEntity game) {
         CardEntity card = new CardEntity();
         card.setGame(game);
         card.setSuit(Suit.values()[random.nextInt(Suit.values().length)]);