diff --git a/build.gradle b/build.gradle
index c98d8bd..3b9a14f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -58,6 +58,13 @@ dependencies {
 	runtimeOnly 'io.jsonwebtoken:jjwt-impl:0.11.5'
 	runtimeOnly 'io.jsonwebtoken:jjwt-jackson:0.11.5'
 
+	// Redis 체크
+	implementation 'io.lettuce:lettuce-core'
+
+	// AOP
+	implementation 'org.springframework.boot:spring-boot-starter-aop'
+
+
 }
 
 tasks.named('test') {
diff --git a/src/main/java/DiffLens/back_end/domain/members/controller/AuthController.java b/src/main/java/DiffLens/back_end/domain/members/controller/AuthController.java
index e5645ba..40bc4eb 100644
--- a/src/main/java/DiffLens/back_end/domain/members/controller/AuthController.java
+++ b/src/main/java/DiffLens/back_end/domain/members/controller/AuthController.java
@@ -2,7 +2,7 @@
 
 import DiffLens.back_end.domain.members.dto.auth.AuthRequestDTO;
 import DiffLens.back_end.domain.members.dto.auth.AuthResponseDTO;
-import DiffLens.back_end.domain.members.service.AuthService;
+import DiffLens.back_end.domain.members.service.auth.AuthService;
 import DiffLens.back_end.global.responses.exception.ApiResponse;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;
diff --git a/src/main/java/DiffLens/back_end/domain/members/service/AuthService.java b/src/main/java/DiffLens/back_end/domain/members/service/auth/AuthService.java
similarity index 97%
rename from src/main/java/DiffLens/back_end/domain/members/service/AuthService.java
rename to src/main/java/DiffLens/back_end/domain/members/service/auth/AuthService.java
index 8fd9ffd..9f822ac 100644
--- a/src/main/java/DiffLens/back_end/domain/members/service/AuthService.java
+++ b/src/main/java/DiffLens/back_end/domain/members/service/auth/AuthService.java
@@ -1,4 +1,4 @@
-package DiffLens.back_end.domain.members.service;
+package DiffLens.back_end.domain.members.service.auth;
 
 import DiffLens.back_end.domain.members.auth.StrategyFactory;
 import DiffLens.back_end.domain.members.auth.strategy.interfaces.AuthStrategy;
diff --git a/src/main/java/DiffLens/back_end/domain/members/service/auth/CurrentUserService.java b/src/main/java/DiffLens/back_end/domain/members/service/auth/CurrentUserService.java
new file mode 100644
index 0000000..5ea2604
--- /dev/null
+++ b/src/main/java/DiffLens/back_end/domain/members/service/auth/CurrentUserService.java
@@ -0,0 +1,41 @@
+package DiffLens.back_end.domain.members.service.auth;
+
+import DiffLens.back_end.domain.members.entity.Member;
+import DiffLens.back_end.global.responses.code.status.error.AuthStatus;
+import DiffLens.back_end.global.responses.exception.handler.ErrorHandler;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Service;
+
+@Service
+public class CurrentUserService {
+
+    public Member getCurrentUser() {
+        var authentication = SecurityContextHolder.getContext().getAuthentication();
+        if (authentication == null) {
+            throw new ErrorHandler(AuthStatus.AUTHENTICATION_FAILED);
+        }
+
+        var principal = authentication.getPrincipal();
+        if (principal == null) {
+            throw new ErrorHandler(AuthStatus.AUTHENTICATION_FAILED);
+        }
+
+        if (!(principal instanceof Member)) {
+            throw new ErrorHandler(AuthStatus.AUTHENTICATION_FAILED);
+        }
+
+        return (Member) principal;
+    }
+
+    public Long getCurrentUserId() {
+        Member user = getCurrentUser();
+        return user != null ? user.getId() : null;
+    }
+
+    public String getCurrentUserEmail() {
+        Member user = getCurrentUser();
+        return user != null ? user.getEmail() : null;
+    }
+
+
+}
diff --git a/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java b/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java
new file mode 100644
index 0000000..4578d7a
--- /dev/null
+++ b/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java
@@ -0,0 +1,60 @@
+package DiffLens.back_end.global.aop;
+
+import DiffLens.back_end.domain.members.service.auth.CurrentUserService;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+@Aspect
+@Component
+@Slf4j
+@RequiredArgsConstructor
+public class ApiRequestLogAspect {
+
+    private final CurrentUserService authService;
+
+    /**
+     * 전/후 처리 모두 가능
+     * CommonPointcut.restControllerEndpoints() Pointcut 지정하여
+     * API 호출 시 호출 전후로 로그 출력하도록 하는 Aspect
+     */
+    @Around("CommonPointCut.restControllerEndpoints()")
+    public Object logApiRequest(ProceedingJoinPoint jp) throws Throwable {
+        long start = System.currentTimeMillis();
+
+        ServletRequestAttributes attrs = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
+        HttpServletRequest request = attrs.getRequest();
+        String uri = request.getRequestURI();
+        String httpMethod = request.getMethod();
+
+        Object currentUser = null;
+        try { currentUser = authService.getCurrentUser(); } catch (Exception ignored) {}
+
+        String methodName = jp.getSignature().getName();
+        String args = jp.getArgs() != null ? String.join(", ", java.util.Arrays.stream(jp.getArgs())
+                .map(String::valueOf).toArray(String[]::new)) : "";
+
+        String userInfo = currentUser != null ? "[User: " + currentUser + "]" : "[User: Anonymous]";
+        String requestInfo = "[" + httpMethod + ": " + uri + " - " + methodName + "(" + args + ")]";
+
+        log.info("⏳ [API 호출 시작] {} {}", userInfo, requestInfo);
+
+        try {
+            Object result = jp.proceed();
+            long end = System.currentTimeMillis();
+            log.info("✅ [API 호출 종료] {} {} - 실행시간: {}ms", userInfo, requestInfo, (end - start));
+            return result;
+        } catch (Throwable ex) {
+            long end = System.currentTimeMillis();
+            log.error("❌ [API 호출 예외] {} {} - 실행시간: {}ms - 예외: {}", userInfo, requestInfo, (end - start), ex.getMessage());
+            throw ex; // 예외를 다시 던져서 컨트롤러에게 전달
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/DiffLens/back_end/global/aop/CommonPointCut.java b/src/main/java/DiffLens/back_end/global/aop/CommonPointCut.java
new file mode 100644
index 0000000..973148a
--- /dev/null
+++ b/src/main/java/DiffLens/back_end/global/aop/CommonPointCut.java
@@ -0,0 +1,10 @@
+package DiffLens.back_end.global.aop;
+
+import org.aspectj.lang.annotation.Pointcut;
+
+public class CommonPointCut {
+
+    // API 호출 시 로그 찍도록 @RestController 어노테이션에 PointCut 설정
+    @Pointcut("within(@org.springframework.web.bind.annotation.RestController *)")
+    public void restControllerEndpoints() {}
+}
diff --git a/src/main/java/DiffLens/back_end/global/redis/RedisHealthChecker.java b/src/main/java/DiffLens/back_end/global/redis/RedisHealthChecker.java
new file mode 100644
index 0000000..6bceb34
--- /dev/null
+++ b/src/main/java/DiffLens/back_end/global/redis/RedisHealthChecker.java
@@ -0,0 +1,34 @@
+package DiffLens.back_end.global.redis;
+
+import jakarta.annotation.PostConstruct;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class RedisHealthChecker {
+
+    private final RedisTemplate<String, Object> redisTemplate;
+
+    @PostConstruct
+    public void checkRedisConnection() {
+        log.info("[Connection Check] Redis 연결 체크...");
+        try {
+            String ping = redisTemplate.getConnectionFactory() != null ? redisTemplate.getConnectionFactory()
+                    .getConnection()
+                    .ping() : "null";
+            if(!"PONG".equals(ping)) {
+                log.error("[Connection Check] Redis 연결 실패 ❌ - 응답값이 'PONG' 이 아님");
+                throw new IllegalStateException("Redis 연결 실패: PING 응답 이상. 응답=" + ping);
+            }
+        }catch (Exception e) {
+            log.error("[Connection Check] Redis 연결 실패 ❌ - {}", e.getMessage());
+            throw new IllegalStateException("Redis 연결 실패: " + e.getMessage(), e);
+        }
+        log.info("[Connection Check] Redis 연결 성공 ✅");
+    }
+
+}
diff --git a/src/main/java/DiffLens/back_end/global/responses/code/status/error/AuthStatus.java b/src/main/java/DiffLens/back_end/global/responses/code/status/error/AuthStatus.java
index 43f7832..372d9db 100644
--- a/src/main/java/DiffLens/back_end/global/responses/code/status/error/AuthStatus.java
+++ b/src/main/java/DiffLens/back_end/global/responses/code/status/error/AuthStatus.java
@@ -10,6 +10,8 @@
 @AllArgsConstructor
 public enum AuthStatus implements BaseErrorCode {
 
+    AUTHENTICATION_FAILED(HttpStatus.UNAUTHORIZED, "AUTH400", "인증에 실패했습니다."),
+
     USER_NOT_FOUND(HttpStatus.NOT_FOUND, "AUTH401", "존재하지 않는 사용자입니다."),
     ALREADY_EXISTS(HttpStatus.BAD_REQUEST, "AUTH402", "이미 존재하는 사용자입니다."),
     INVALID_PASSWORD(HttpStatus.BAD_REQUEST, "AUTH403", "올바르지 않은 비밀번호입니다."),
@@ -22,7 +24,7 @@ public enum AuthStatus implements BaseErrorCode {
 
     SOCIAL_USERINFO_API_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "AUTH504", "소셜 사용자 정보를 가져오지 못했습니다."),
     SOCIAL_USERINFO_NETWORK_ERROR(HttpStatus.SERVICE_UNAVAILABLE, "AUTH505", "소셜 사용자 정보 요청 중 네트워크 오류가 발생했습니다."),
-    SOCIAL_USERINFO_UNKNOWN_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "AUTH506", "소셜 사용자 정보 처리 중 오류가 발생했습니다.")
+    SOCIAL_USERINFO_UNKNOWN_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "AUTH506", "소셜 사용자 정보 처리 중 오류가 발생했습니다."),
 
     ;
 
diff --git a/src/main/java/DiffLens/back_end/global/responses/exception/ExceptionAdvice.java b/src/main/java/DiffLens/back_end/global/responses/exception/ExceptionAdvice.java
index da63e60..4956776 100644
--- a/src/main/java/DiffLens/back_end/global/responses/exception/ExceptionAdvice.java
+++ b/src/main/java/DiffLens/back_end/global/responses/exception/ExceptionAdvice.java
@@ -106,7 +106,7 @@ public ResponseEntity<Object> handleMethodArgumentNotValid(
         });
 
         return handleExceptionInternalArgs(
-                e, HttpHeaders.EMPTY, ErrorStatus.valueOf("_BAD_REQUEST"), request, errors);
+                e, HttpHeaders.EMPTY, ErrorStatus.valueOf("BAD_REQUEST"), request, errors);
     }
 
     @ExceptionHandler
diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index d874c8a..73eb48f 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -20,6 +20,7 @@ spring:
     redis:
       host: ${REDIS_HOSTNAME}
       port: ${REDIS_PORT}
+      timeout: 2000ms
 
 
 
diff --git a/src/main/resources/application-local.yml b/src/main/resources/application-local.yml
index 732a2e6..5972db9 100644
--- a/src/main/resources/application-local.yml
+++ b/src/main/resources/application-local.yml
@@ -22,6 +22,7 @@ spring:
     redis:
       host: localhost
       port: 6381
+      timeout: 2000ms