diff --git a/src/main/java/EatPic/spring/domain/calendar/controller/CalendarController.java b/src/main/java/EatPic/spring/domain/calendar/controller/CalendarController.java
index 290ba46..e86343c 100644
--- a/src/main/java/EatPic/spring/domain/calendar/controller/CalendarController.java
+++ b/src/main/java/EatPic/spring/domain/calendar/controller/CalendarController.java
@@ -3,9 +3,12 @@
 import EatPic.spring.domain.calendar.dto.CalendarDayResponse;
 import EatPic.spring.domain.calendar.service.CalendarService;
 import EatPic.spring.domain.card.repository.CardRepository;
+import EatPic.spring.domain.user.entity.User;
+import EatPic.spring.domain.user.service.UserService;
 import EatPic.spring.global.common.ApiResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.servlet.http.HttpServletRequest;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -20,6 +23,7 @@
 public class CalendarController {
 
   private final CalendarService calendarService;
+  private final UserService userService;
 
 
   @Operation(summary = "캘린더 화면 데이터 조회",  //Operation의 구성요소 중 하나로, API에 대한 한줄요약.
@@ -27,12 +31,14 @@ public class CalendarController {
   @GetMapping
   public ApiResponse<List<CalendarDayResponse>> getCalendar(
       //@AuthenticationPrincipal CustomUserDetails userDetails,
+      HttpServletRequest request,
       @RequestParam int year,
       @RequestParam int month
   ) {
-    Long userId = 1L; //Long userId = userDetails.getUser().getId(); //로그인 구현 시 이렇게 바꾸기
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L; //Long userId = userDetails.getUser().getId(); //로그인 구현 시 이렇게 바꾸기
     //User user = userDetails.getUser(); //아니면 이렇게 해서 객체 자체를 넘기기 (이게 일반적인 방법)
-    return ApiResponse.onSuccess(calendarService.getCalendar(userId, year, month));
+    return ApiResponse.onSuccess(calendarService.getCalendar(user, year, month));
   }
 
 
diff --git a/src/main/java/EatPic/spring/domain/calendar/service/CalendarService.java b/src/main/java/EatPic/spring/domain/calendar/service/CalendarService.java
index 8c3177b..7553620 100644
--- a/src/main/java/EatPic/spring/domain/calendar/service/CalendarService.java
+++ b/src/main/java/EatPic/spring/domain/calendar/service/CalendarService.java
@@ -4,6 +4,7 @@
 import EatPic.spring.domain.card.entity.Card;
 import EatPic.spring.domain.card.entity.Meal;
 import EatPic.spring.domain.card.repository.CardRepository;
+import EatPic.spring.domain.user.entity.User;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
@@ -24,7 +25,9 @@
 public class CalendarService {
   private final CardRepository cardRepository;
 
-  public List<CalendarDayResponse> getCalendar(Long userId, int year, int month) {
+  public List<CalendarDayResponse> getCalendar(User user, int year, int month) {
+    Long userId = user.getId();
+
     // 현재 월과 이전 월 구하기
     YearMonth currentMonth = YearMonth.of(year, month);
     YearMonth previousMonth = currentMonth.minusMonths(1);
diff --git a/src/main/java/EatPic/spring/domain/card/controller/CardController.java b/src/main/java/EatPic/spring/domain/card/controller/CardController.java
index b14b7fe..9df0228 100644
--- a/src/main/java/EatPic/spring/domain/card/controller/CardController.java
+++ b/src/main/java/EatPic/spring/domain/card/controller/CardController.java
@@ -46,6 +46,7 @@ public class CardController {
   @PostMapping(value = "", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
   @Operation(summary = "픽카드 생성하기 (픽카드 기록 작성)", description = "픽카드를 생성할 때 호출되는 api")
   public ApiResponse<CreateCardResponse> createCard(
+        HttpServletRequest req,
           @RequestParam("request") String requestJson,
           @RequestPart(value = "cardImageFile", required = false) MultipartFile cardImageFile) {
 
@@ -57,12 +58,13 @@ public ApiResponse<CreateCardResponse> createCard(
       throw new GeneralException(ErrorStatus.REQUEST_BODY_INVALID);
     }
 
-    Long userId = 1L;
+    //Long userId = 1L;
+    User user = userService.getLoginUser(req);
 
     if (cardImageFile == null || cardImageFile.isEmpty()) {
       throw new GeneralException(ErrorStatus.IMAGE_REQUIRED);
     }
-    CardResponse.CreateCardResponse response = cardService.createNewCard(request, userId, cardImageFile);
+    CardResponse.CreateCardResponse response = cardService.createNewCard(request, user, cardImageFile);
     return ApiResponse.onSuccess(response);
   }
 
@@ -115,12 +117,13 @@ public ApiResponse<List<TodayCardResponse>> getTodayCards(
   @Operation(summary = "픽카드 수정", description = "카드의 메모, 레시피, 위치 정보 등을 수정합니다.")
   @PutMapping("/api/cards/{cardId}")
   public ResponseEntity<ApiResponse<CardDetailResponse>> updateCard(
+          HttpServletRequest req,
           @Parameter(description = "수정할 카드 ID", example = "12")
           @PathVariable(name = "cardId") Long cardId,
           @RequestBody CardUpdateRequest request)
   {
-    Long userId = 1L;
-    return ResponseEntity.ok(ApiResponse.onSuccess(cardService.updateCard(cardId, userId, request)));
+    User user = userService.getLoginUser(req);
+    return ResponseEntity.ok(ApiResponse.onSuccess(cardService.updateCard(cardId, user, request)));
   }
 
   @Operation(
diff --git a/src/main/java/EatPic/spring/domain/card/service/CardService.java b/src/main/java/EatPic/spring/domain/card/service/CardService.java
index cdb8f13..49ebe4c 100644
--- a/src/main/java/EatPic/spring/domain/card/service/CardService.java
+++ b/src/main/java/EatPic/spring/domain/card/service/CardService.java
@@ -15,12 +15,12 @@
 import java.util.List;
 
 public interface CardService {
-  CardResponse.CreateCardResponse createNewCard(CardCreateRequest.CreateCardRequest request, Long userId, MultipartFile cardImageFile);
+  CardResponse.CreateCardResponse createNewCard(CardCreateRequest.CreateCardRequest request, User user, MultipartFile cardImageFile);
   CardDetailResponse getCardDetail(Long cardId, Long userId);
   CardFeedResponse getCardFeed(Long cardId, Long userId);
   void deleteCard(Long cardId, Long userId);
   List<TodayCardResponse> getTodayCards(Long userId);
-  CardDetailResponse updateCard(Long cardId, Long userId, CardUpdateRequest request);
+  CardDetailResponse updateCard(Long cardId, User user, CardUpdateRequest request);
   CardResponse.PagedCardFeedResponseDto getCardFeedByCursor(HttpServletRequest request, Long userId, int size, Long cursor);
   List<RecommendCardResponse> getRecommendedCardPreviews(Long userId);
 }
diff --git a/src/main/java/EatPic/spring/domain/card/service/CardServiceImpl.java b/src/main/java/EatPic/spring/domain/card/service/CardServiceImpl.java
index 3f89eb7..ae59a60 100644
--- a/src/main/java/EatPic/spring/domain/card/service/CardServiceImpl.java
+++ b/src/main/java/EatPic/spring/domain/card/service/CardServiceImpl.java
@@ -98,10 +98,11 @@ private void connectHashtagsToCard(Card card, List<String> hashtags, User user)
 
     @Override
     @Transactional
-    public CardResponse.CreateCardResponse createNewCard(CardCreateRequest.CreateCardRequest request, Long userId, MultipartFile cardImageFile) {
+    public CardResponse.CreateCardResponse createNewCard(CardCreateRequest.CreateCardRequest request, User user, MultipartFile cardImageFile) {
 
+        Long userId = user.getId();
         // 아직 유저 관련 처리 안했음
-        User user = userRepository.findUserById(userId);
+        //User user = userRepository.findUserById(userId);
 
         // 오늘 날짜 00:00부터 23:59:59까지 범위 계산
         LocalDate today = LocalDate.now();
@@ -287,11 +288,11 @@ public List<TodayCardResponse> getTodayCards(Long userId) {
 
     @Override
     @Transactional
-    public CardDetailResponse updateCard(Long cardId, Long userId, CardUpdateRequest request) {
+    public CardDetailResponse updateCard(Long cardId, User user, CardUpdateRequest request) {
         Card card = cardRepository.findById(cardId)
             .orElseThrow(() -> new ExceptionHandler(ErrorStatus.CARD_NOT_FOUND));
 
-        if (!card.getUser().getId().equals(userId)) {
+        if (!card.getUser().getId().equals(user.getId())) {
             throw new ExceptionHandler(ErrorStatus.CARD_UPDATE_FORBIDDEN);
         }
 
diff --git a/src/main/java/EatPic/spring/domain/notification/controller/NotificationController.java b/src/main/java/EatPic/spring/domain/notification/controller/NotificationController.java
index 7bb5fd4..2e1a5d8 100644
--- a/src/main/java/EatPic/spring/domain/notification/controller/NotificationController.java
+++ b/src/main/java/EatPic/spring/domain/notification/controller/NotificationController.java
@@ -7,6 +7,7 @@
 import EatPic.spring.global.common.ApiResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.servlet.http.HttpServletRequest;
 import java.util.List;
 import java.util.Map;
 import lombok.RequiredArgsConstructor;
@@ -25,25 +26,34 @@ public class NotificationController {
 
   @GetMapping("/recent")
   @Operation(summary = "최근 알림 목록 조회 (7일 이내)", description = "현재 로그인한 사용자의 최근 알림을 조회합니다.")
-  public ApiResponse<List<RecentNotificationResponse>> getRecentNotifications() {
-    Long userId = 1L; //Long userId = userDetails.getUser().getId(); //로그인 구현 시 이렇게 바꾸기
+  public ApiResponse<List<RecentNotificationResponse>> getRecentNotifications(
+      HttpServletRequest request
+  ) {
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L; //Long userId = userDetails.getUser().getId(); //로그인 구현 시 이렇게 바꾸기
     //User user = userDetails.getUser(); //아니면 이렇게 해서 객체 자체를 넘기기 (이게 일반적인 방법)
-    return ApiResponse.onSuccess(notificationService.getRecentNotifications(userId));
+    return ApiResponse.onSuccess(notificationService.getRecentNotifications(user));
   }
 
   @PostMapping("/check")
   @Operation(summary = "알림 확인 시간 업데이트", description = "사용자가 알림 화면에 들어가면 마지막 확인 시간을 업데이트합니다.")
-  public ApiResponse<Void> checkNotifications() {
-    Long userId = 1L; // 로그인 기능 구현 전 임시 사용자
-    notificationService.checkNotifications(userId);
+  public ApiResponse<Void> checkNotifications(
+      HttpServletRequest request
+  ) {
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L; // 로그인 기능 구현 전 임시 사용자
+    notificationService.checkNotifications(user);
     return ApiResponse.onSuccess(null);
   }
 
   @GetMapping("/unread-status")
   @Operation(summary = "새 알림 여부 확인", description = "최근 알림 생성 시각과 마지막 확인 시각을 비교하여 새 알림 여부를 반환합니다.")
-  public ApiResponse<Map<String, Boolean>> getUnreadStatus() {
-    Long userId = 1L; // 로그인 기능 구현 전 임시 사용자
-    boolean isUnread = notificationService.isUnreadNotification(userId);
+  public ApiResponse<Map<String, Boolean>> getUnreadStatus(
+      HttpServletRequest request
+  ) {
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L; // 로그인 기능 구현 전 임시 사용자
+    boolean isUnread = notificationService.isUnreadNotification(user);
     return ApiResponse.onSuccess(Map.of("isUnread", isUnread));
   }
 
diff --git a/src/main/java/EatPic/spring/domain/notification/service/NotificationService.java b/src/main/java/EatPic/spring/domain/notification/service/NotificationService.java
index 3c68af0..3329fa4 100644
--- a/src/main/java/EatPic/spring/domain/notification/service/NotificationService.java
+++ b/src/main/java/EatPic/spring/domain/notification/service/NotificationService.java
@@ -11,6 +11,7 @@
 import EatPic.spring.domain.user.repository.UserFollowRepository;
 import EatPic.spring.domain.user.repository.UserRepository;
 import EatPic.spring.global.common.code.status.ErrorStatus;
+import EatPic.spring.global.common.exception.GeneralException;
 import EatPic.spring.global.common.exception.handler.ExceptionHandler;
 import java.time.LocalDateTime;
 import java.util.List;
@@ -27,8 +28,7 @@ public class NotificationService {
   private final UserRepository userRepository;
 
 
-  public List<RecentNotificationResponse> getRecentNotifications(Long userId) {
-    User currentUser = userRepository.findById(userId).orElse(null);
+  public List<RecentNotificationResponse> getRecentNotifications(User currentUser) {
     // 7일 전 기준 시각
     LocalDateTime sevenDaysAgo = LocalDateTime.now().minusDays(7);
 
@@ -62,18 +62,12 @@ private RecentNotificationResponse convertToDto(Notification notification, User
     return NotificationConverter.toRecentNotificationResponse(notification, cardImageUrl, isFollowing);
   }
 
-  public void checkNotifications(Long userId) {
-    User user = userRepository.findById(userId)
-        .orElseThrow(() -> new ExceptionHandler(ErrorStatus.USER_NOT_FOUND));
-
+  public void checkNotifications(User user) {
     user.updateLastNotificationCheckAt(LocalDateTime.now());
     userRepository.save(user);
   }
 
-  public boolean isUnreadNotification(Long userId) {
-    User user = userRepository.findById(userId)
-        .orElseThrow(() -> new ExceptionHandler(ErrorStatus.USER_NOT_FOUND));
-
+  public boolean isUnreadNotification(User user) {
     LocalDateTime lastChecked = user.getLastNotificationCheckAt();
     Notification latest = notificationRepository.findTopByReceiverOrderByCreatedAtDesc(user);
 
diff --git a/src/main/java/EatPic/spring/domain/user/controller/UserBadgeController.java b/src/main/java/EatPic/spring/domain/user/controller/UserBadgeController.java
index a95aa5c..4369aab 100644
--- a/src/main/java/EatPic/spring/domain/user/controller/UserBadgeController.java
+++ b/src/main/java/EatPic/spring/domain/user/controller/UserBadgeController.java
@@ -5,9 +5,11 @@
 import EatPic.spring.domain.user.entity.User;
 import EatPic.spring.domain.user.repository.UserBadgeRepository;
 import EatPic.spring.domain.user.service.UserBadgeService;
+import EatPic.spring.domain.user.service.UserService;
 import EatPic.spring.global.common.ApiResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.servlet.http.HttpServletRequest;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -23,21 +25,27 @@ public class UserBadgeController {
 
   private final UserBadgeRepository userBadgeRepository;
   private final UserBadgeService userBadgeService;
+  private final UserService userService;
 
   @GetMapping("/home")
   @Operation(summary = "홈화면 진입 시 유저 뱃지 리스트 이행률순 조회 ", description = "홈화면에서 유저가 보유한 뱃지 리스트를 이행률 기준으로 정렬하여 조회합니다.")
-  public ApiResponse<List<HomeBadgeResponse>> getUserBadgesForHome() {
-    Long userId = 1L;
-    List<HomeBadgeResponse> responses = userBadgeService.getUserBadgesForHome(userId);
+  public ApiResponse<List<HomeBadgeResponse>> getUserBadgesForHome(
+      HttpServletRequest request
+  ) {
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L;
+    List<HomeBadgeResponse> responses = userBadgeService.getUserBadgesForHome(user);
     return ApiResponse.onSuccess(responses);
   }
 
   @Operation(summary = "유저 뱃지 상세 조회", description = "뱃지 팝업에 들어갈 상세 정보를 조회합니다.")
   @GetMapping("/my/{userBadgeId}")
   public ApiResponse<BadgeDetailResponseDTO> getBadgeDetail(
+      HttpServletRequest request,
       @PathVariable Long userBadgeId) {
-    Long userId = 1L;
-    return ApiResponse.onSuccess(userBadgeService.getBadgeDetail(userId, userBadgeId));
+    User user = userService.getLoginUser(request);
+    //Long userId = 1L;
+    return ApiResponse.onSuccess(userBadgeService.getBadgeDetail(user, userBadgeId));
   }
 
 }
diff --git a/src/main/java/EatPic/spring/domain/user/service/UserBadgeService.java b/src/main/java/EatPic/spring/domain/user/service/UserBadgeService.java
index 378aaa7..8508209 100644
--- a/src/main/java/EatPic/spring/domain/user/service/UserBadgeService.java
+++ b/src/main/java/EatPic/spring/domain/user/service/UserBadgeService.java
@@ -34,14 +34,14 @@ public class UserBadgeService {
   private final ReactionRepository reactionRepository;
 
   // 홈화면 뱃지 리스트 조회
-  public List<HomeBadgeResponse> getUserBadgesForHome(Long userId) {
-    User user = userRepository.findUserById(userId); // 로그인 적용할 때 바꾸기!! 인자 User로 받기!
+  @Transactional
+  public List<HomeBadgeResponse> getUserBadgesForHome(User user) {
     List<UserBadge> userBadges = userBadgeRepository.findByUser(user);
     return UserBadgeConverter.toHomeBadgeDTOList(userBadges);
   }
 
-  public BadgeDetailResponseDTO getBadgeDetail(Long userId, Long userBadgeId) {
-    User user = userRepository.findUserById(userId);
+  @Transactional
+  public BadgeDetailResponseDTO getBadgeDetail(User user, Long userBadgeId) {
     UserBadge userBadge = userBadgeRepository.findByUser_IdAndUserBadgeId(user.getId(), userBadgeId)
         .orElseThrow(() -> new ExceptionHandler(ErrorStatus._BAD_REQUEST));
     return UserBadgeConverter.toBadgeDetailResponse(userBadge);