diff --git a/src/main/java/org/nkcoder/notification/NotificationService.java b/src/main/java/org/nkcoder/notification/NotificationService.java
index 1201660..a46fa76 100644
--- a/src/main/java/org/nkcoder/notification/NotificationService.java
+++ b/src/main/java/org/nkcoder/notification/NotificationService.java
@@ -1,16 +1,20 @@
 package org.nkcoder.notification;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Service;
 
 @Service
 public class NotificationService {
+    private final Logger logger = LoggerFactory.getLogger(this.getClass());
+
     public void sendWelcomeEmail(String email, String userName) {
         // TODO: implement email sending
-        System.out.println("Sending Welcome email to " + email + ", for user: " + userName);
+        logger.info("Sending Welcome email to {}, for user: {}", email, userName);
     }
 
     public void sendPasswordResetEmail(String email, String userName) {
         // TODO: implement password reset email
-        System.out.println("Sending password reset email to " + email + ", for user: " + userName);
+        logger.info("Sending password reset email to {}, for user: {}", email, userName);
     }
 }
diff --git a/src/main/java/org/nkcoder/user/application/service/AuthApplicationService.java b/src/main/java/org/nkcoder/user/application/service/AuthApplicationService.java
index 8016269..8f6451a 100644
--- a/src/main/java/org/nkcoder/user/application/service/AuthApplicationService.java
+++ b/src/main/java/org/nkcoder/user/application/service/AuthApplicationService.java
@@ -1,6 +1,8 @@
 package org.nkcoder.user.application.service;
 
 import java.time.LocalDateTime;
+import org.nkcoder.shared.kernel.domain.event.DomainEventPublisher;
+import org.nkcoder.shared.kernel.domain.event.UserRegisteredEvent;
 import org.nkcoder.shared.kernel.exception.AuthenticationException;
 import org.nkcoder.shared.kernel.exception.ValidationException;
 import org.nkcoder.user.application.dto.command.LoginCommand;
@@ -27,7 +29,6 @@
 
 /** Application service for authentication use cases. Orchestrates domain objects and infrastructure services. */
 @Service
-@Transactional
 public class AuthApplicationService {
 
     private static final Logger logger = LoggerFactory.getLogger(AuthApplicationService.class);
@@ -42,6 +43,7 @@ public class AuthApplicationService {
     private final TokenGenerator tokenGenerator;
     private final AuthenticationService authenticationService;
     private final TokenRotationService tokenRotationService;
+    private final DomainEventPublisher eventPublisher;
 
     public AuthApplicationService(
             UserRepository userRepository,
@@ -49,15 +51,18 @@ public AuthApplicationService(
             PasswordEncoder passwordEncoder,
             TokenGenerator tokenGenerator,
             AuthenticationService authenticationService,
-            TokenRotationService tokenRotationService) {
+            TokenRotationService tokenRotationService,
+            DomainEventPublisher eventPublisher) {
         this.userRepository = userRepository;
         this.refreshTokenRepository = refreshTokenRepository;
         this.passwordEncoder = passwordEncoder;
         this.tokenGenerator = tokenGenerator;
         this.authenticationService = authenticationService;
         this.tokenRotationService = tokenRotationService;
+        this.eventPublisher = eventPublisher;
     }
 
+    @Transactional
     public AuthResult register(RegisterCommand command) {
         logger.debug("Registering new user with email: {}", command.email());
 
@@ -75,6 +80,9 @@ public AuthResult register(RegisterCommand command) {
         user = userRepository.save(user);
         logger.debug("User registered with ID: {}", user.getId().value());
 
+        eventPublisher.publish(new UserRegisteredEvent(
+                user.getId().value(), user.getEmail().value(), user.getName().value()));
+
         // Generate tokens
         TokenFamily tokenFamily = TokenFamily.generate();
         TokenPair tokens = tokenRotationService.generateTokens(user, tokenFamily);
@@ -85,6 +93,7 @@ public AuthResult register(RegisterCommand command) {
         return AuthResult.of(user.getId().value(), user.getEmail().value(), user.getRole(), tokens);
     }
 
+    @Transactional()
     public AuthResult login(LoginCommand command) {
         logger.debug("Logging in user with email: {}", command.email());
 
@@ -151,6 +160,7 @@ public AuthResult refreshTokens(RefreshTokenCommand command) {
         }
     }
 
+    @Transactional
     public void logout(String refreshToken) {
         logger.debug("Logging out user (all devices)");
 
@@ -163,6 +173,7 @@ public void logout(String refreshToken) {
         });
     }
 
+    @Transactional
     public void logoutSingle(String refreshToken) {
         logger.debug("Logging out user (single device)");
 
@@ -171,6 +182,7 @@ public void logoutSingle(String refreshToken) {
         logger.debug("Logged out from current device");
     }
 
+    @Transactional
     public void cleanupExpiredTokens() {
         logger.debug("Cleaning up expired refresh tokens");
         refreshTokenRepository.deleteExpiredTokens(LocalDateTime.now());
diff --git a/src/test/java/org/nkcoder/user/application/service/AuthApplicationServiceTest.java b/src/test/java/org/nkcoder/user/application/service/AuthApplicationServiceTest.java
index c0e3c73..d7e6381 100644
--- a/src/test/java/org/nkcoder/user/application/service/AuthApplicationServiceTest.java
+++ b/src/test/java/org/nkcoder/user/application/service/AuthApplicationServiceTest.java
@@ -18,6 +18,7 @@
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
+import org.nkcoder.shared.kernel.domain.event.DomainEventPublisher;
 import org.nkcoder.shared.kernel.exception.AuthenticationException;
 import org.nkcoder.shared.kernel.exception.ValidationException;
 import org.nkcoder.user.application.dto.command.LoginCommand;
@@ -62,6 +63,9 @@ class AuthApplicationServiceTest {
     @Mock
     private TokenRotationService tokenRotationService;
 
+    @Mock
+    private DomainEventPublisher eventPublisher;
+
     private AuthApplicationService authApplicationService;
 
     @BeforeEach
@@ -72,7 +76,8 @@ void setUp() {
                 passwordEncoder,
                 tokenGenerator,
                 authenticationService,
-                tokenRotationService);
+                tokenRotationService,
+                eventPublisher);
     }
 
     @Nested