diff --git a/src/main/java/com/chaineeproject/chainee/controller/JobApplicationController.java b/src/main/java/com/chaineeproject/chainee/controller/JobApplicationController.java
index fa47e02..2a4afd2 100644
--- a/src/main/java/com/chaineeproject/chainee/controller/JobApplicationController.java
+++ b/src/main/java/com/chaineeproject/chainee/controller/JobApplicationController.java
@@ -1,3 +1,4 @@
+// src/main/java/com/chaineeproject/chainee/controller/JobApplicationController.java
 package com.chaineeproject.chainee.controller;
 
 import com.chaineeproject.chainee.dto.JobApplicationRequest;
@@ -6,8 +7,11 @@
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.oauth2.jwt.Jwt;
 import org.springframework.web.bind.annotation.*;
 
 @RestController
@@ -19,14 +23,17 @@ public class JobApplicationController {
     private final JobApplicationService jobApplicationService;
 
     @PostMapping("/{postId}/apply")
-    @Operation(summary = "채용 공고 지원", description = "지정한 채용 공고 ID에 대해 지원서를 제출합니다.")
+    @Operation(summary = "채용 공고 지원", description = "요청 사용자의 JWT uid를 지원자로 하여 지정한 공고에 지원합니다.")
     public ResponseEntity<JobApplicationResponse> applyToJob(
+            @AuthenticationPrincipal Jwt jwt,
             @Parameter(description = "지원할 채용 공고 ID", example = "1")
             @PathVariable Long postId,
-
-            @RequestBody JobApplicationRequest request
+            @Valid @RequestBody JobApplicationRequest request
     ) {
-        jobApplicationService.applyToJob(postId, request);
+        Long applicantId = com.chaineeproject.chainee.security.SecurityUtils.uidOrNull(jwt);
+        if (applicantId == null) return ResponseEntity.status(401).build();
+
+        jobApplicationService.applyToJob(postId, applicantId, request.resumeId());
         return ResponseEntity.ok(new JobApplicationResponse(true, "APPLICATION_SUBMITTED"));
     }
 }
diff --git a/src/main/java/com/chaineeproject/chainee/dto/JobApplicationRequest.java b/src/main/java/com/chaineeproject/chainee/dto/JobApplicationRequest.java
index 7e9295f..ca663b7 100644
--- a/src/main/java/com/chaineeproject/chainee/dto/JobApplicationRequest.java
+++ b/src/main/java/com/chaineeproject/chainee/dto/JobApplicationRequest.java
@@ -1,12 +1,11 @@
+// src/main/java/com/chaineeproject/chainee/dto/JobApplicationRequest.java
 package com.chaineeproject.chainee.dto;
 
 import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
 
 @Schema(description = "채용 공고 지원 요청 DTO")
 public record JobApplicationRequest(
-        @Schema(description = "지원자의 ID", example = "19")
-        Long applicantId,
-
-        @Schema(description = "지원자가 선택한 이력서 ID", example = "42")
-        Long resumeId
+        @Schema(description = "지원자가 제출할 이력서 ID", example = "42")
+        @NotNull Long resumeId
 ) {}
diff --git a/src/main/java/com/chaineeproject/chainee/service/JobApplicationService.java b/src/main/java/com/chaineeproject/chainee/service/JobApplicationService.java
index aafd892..9db45e3 100644
--- a/src/main/java/com/chaineeproject/chainee/service/JobApplicationService.java
+++ b/src/main/java/com/chaineeproject/chainee/service/JobApplicationService.java
@@ -1,7 +1,6 @@
 // src/main/java/com/chaineeproject/chainee/service/JobApplicationService.java
 package com.chaineeproject.chainee.service;
 
-import com.chaineeproject.chainee.dto.JobApplicationRequest;
 import com.chaineeproject.chainee.entity.*;
 import com.chaineeproject.chainee.event.JobApplicationCreatedEvent;
 import com.chaineeproject.chainee.exception.ApplicationException;
@@ -25,25 +24,28 @@ public class JobApplicationService {
     private final ApplicationEventPublisher eventPublisher;
 
     @Transactional
-    public void applyToJob(Long postId, JobApplicationRequest request) {
-        // 1. 지원자 조회 (ID)
-        User applicant = userRepository.findById(request.applicantId())
+    public void applyToJob(Long postId, Long applicantId, Long resumeId) {
+        // 1) 지원자 조회(JWT uid로 강제)
+        User applicant = userRepository.findById(applicantId)
                 .orElseThrow(() -> new ApplicationException(ErrorCode.APPLICANT_NOT_FOUND));
 
-        // 2. 공고 조회
+        // 2) 공고 조회
         JobPost post = jobPostRepository.findById(postId)
                 .orElseThrow(() -> new ApplicationException(ErrorCode.JOB_POST_NOT_FOUND));
 
-        // 3. 이력서 조회
-        Resume resume = resumeRepository.findById(request.resumeId())
+        // 3) 이력서 조회 + 소유권 검증(남의 이력서로 지원 방지)
+        Resume resume = resumeRepository.findById(resumeId)
                 .orElseThrow(() -> new ApplicationException(ErrorCode.RESUME_NOT_FOUND));
+        if (resume.getOwner() == null || !resume.getOwner().getId().equals(applicantId)) {
+            throw new ApplicationException(ErrorCode.FORBIDDEN); // 또는 전용 에러코드 정의 가능: NOT_OWNER_OF_RESUME
+        }
 
-        // 4. 중복 지원 방지
-        if (jobApplicationRepository.existsByPostIdAndApplicantId(postId, applicant.getId())) {
+        // 4) 중복 지원 방지
+        if (jobApplicationRepository.existsByPostIdAndApplicantId(postId, applicantId)) {
             throw new ApplicationException(ErrorCode.DUPLICATE_APPLICATION);
         }
 
-        // 5. 지원 엔티티 생성 및 저장
+        // 5) 저장
         JobApplication application = new JobApplication();
         application.setPost(post);
         application.setApplicant(applicant);
@@ -53,6 +55,8 @@ public void applyToJob(Long postId, JobApplicationRequest request) {
 
         jobApplicationRepository.save(application);
         jobPostRepository.incrementApplicantCount(postId);
+
+        // 6) 이벤트(알림용)
         eventPublisher.publishEvent(new JobApplicationCreatedEvent(application.getId()));
     }
 }