diff --git a/src/main/java/com/example/jehunonboarding/controller/JobPostingController.java b/src/main/java/com/example/jehunonboarding/controller/JobPostingController.java
index c390ba0..b7ce71f 100644
--- a/src/main/java/com/example/jehunonboarding/controller/JobPostingController.java
+++ b/src/main/java/com/example/jehunonboarding/controller/JobPostingController.java
@@ -49,7 +49,8 @@ public ResponseEntity<JobPostingFindDetailResponse> findDetail(@PathVariable int
     }
 
     @PostMapping("/v1/job-postings/{jobPostingId}/apply")
-    public ResponseEntity<CommonResponse> apply(@RequestBody JobPostingApplyRequest request) {
+    public ResponseEntity<CommonResponse> apply(@Valid @RequestBody JobPostingApplyRequest request) {
+        jobPostingService.apply(request.getCompanyId(), request.getMemberId());
         return new ResponseEntity(new CommonResponse(true), HttpStatus.OK);
     }
 
diff --git a/src/main/java/com/example/jehunonboarding/controller/request/JobPostingApplyRequest.java b/src/main/java/com/example/jehunonboarding/controller/request/JobPostingApplyRequest.java
index 7557eff..0365e1b 100644
--- a/src/main/java/com/example/jehunonboarding/controller/request/JobPostingApplyRequest.java
+++ b/src/main/java/com/example/jehunonboarding/controller/request/JobPostingApplyRequest.java
@@ -1,9 +1,12 @@
 package com.example.jehunonboarding.controller.request;
 
+import jakarta.validation.constraints.NotNull;
 import lombok.Data;
 
 @Data
 public class JobPostingApplyRequest {
+    @NotNull(message = "companyId가 존재하지 않습니다")
     private int companyId;
-    private int userId;
+    @NotNull(message = "memberId가 존재하지 않습니다")
+    private int memberId;
 }
diff --git a/src/main/java/com/example/jehunonboarding/domain/JobPostingService.java b/src/main/java/com/example/jehunonboarding/domain/JobPostingService.java
index acd4215..eae0d36 100644
--- a/src/main/java/com/example/jehunonboarding/domain/JobPostingService.java
+++ b/src/main/java/com/example/jehunonboarding/domain/JobPostingService.java
@@ -2,6 +2,8 @@
 
 import com.example.jehunonboarding.repository.CompanyRepository;
 import com.example.jehunonboarding.repository.JobPostingRepository;
+import com.example.jehunonboarding.repository.ResumeRepository;
+import com.example.jehunonboarding.repository.MemberRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
@@ -14,6 +16,8 @@ public class JobPostingService {
 
     private final JobPostingRepository jobPostingRepository;
     private final CompanyRepository companyRepository;
+    private final MemberRepository memberRepository;
+    private final ResumeRepository resumeRepository;
 
     public void register(JobPostingRegisterInfo registerInfo) {
         companyRepository.findById(registerInfo.getCompanyId())
@@ -33,4 +37,19 @@ public void register(JobPostingRegisterInfo registerInfo) {
     public List<JobPosting> search(Pageable pageable, String keyword) {
         return jobPostingRepository.findByKeyword(pageable, keyword);
     }
+
+    public void apply(int companyId, int memberId) {
+        companyRepository.findById(companyId)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 회사입니다."));
+
+        memberRepository.findById(memberId)
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 유저입니다."));
+
+        resumeRepository.findByMemberIdAndCompanyId(memberId, companyId)
+                .ifPresent(resume -> {
+                    throw new IllegalArgumentException("이미 지원이 완료되었습니다.");
+                });
+
+        resumeRepository.save(new ResumeEntity(memberId, companyId));
+    }
 }
diff --git a/src/main/java/com/example/jehunonboarding/domain/MemberEntity.java b/src/main/java/com/example/jehunonboarding/domain/MemberEntity.java
new file mode 100644
index 0000000..39b2fc2
--- /dev/null
+++ b/src/main/java/com/example/jehunonboarding/domain/MemberEntity.java
@@ -0,0 +1,20 @@
+package com.example.jehunonboarding.domain;
+
+import jakarta.persistence.*;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "member")
+@NoArgsConstructor
+public class MemberEntity {
+    @Id
+    @GeneratedValue
+    @Column(name = "id", nullable = false)
+    private Integer id;
+
+    @Column(nullable = false)
+    private String name;
+
+    @Column(nullable = false)
+    private String email;
+}
diff --git a/src/main/java/com/example/jehunonboarding/domain/ResumeEntity.java b/src/main/java/com/example/jehunonboarding/domain/ResumeEntity.java
new file mode 100644
index 0000000..7d1798f
--- /dev/null
+++ b/src/main/java/com/example/jehunonboarding/domain/ResumeEntity.java
@@ -0,0 +1,24 @@
+package com.example.jehunonboarding.domain;
+
+import jakarta.persistence.*;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "resume")
+@NoArgsConstructor
+public class ResumeEntity {
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    @Column(nullable = false)
+    private Long memberId;
+
+    @Column(nullable = false)
+    private Long companyId;
+
+    public ResumeEntity(int memberId, int companyId) {
+        this.memberId = (long) memberId;
+        this.companyId = (long) companyId;
+    }
+}
diff --git a/src/main/java/com/example/jehunonboarding/repository/MemberRepository.java b/src/main/java/com/example/jehunonboarding/repository/MemberRepository.java
new file mode 100644
index 0000000..e9d4ebe
--- /dev/null
+++ b/src/main/java/com/example/jehunonboarding/repository/MemberRepository.java
@@ -0,0 +1,7 @@
+package com.example.jehunonboarding.repository;
+
+import com.example.jehunonboarding.domain.MemberEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface MemberRepository extends JpaRepository<MemberEntity, Integer> {
+}
diff --git a/src/main/java/com/example/jehunonboarding/repository/ResumeRepository.java b/src/main/java/com/example/jehunonboarding/repository/ResumeRepository.java
new file mode 100644
index 0000000..3cb8532
--- /dev/null
+++ b/src/main/java/com/example/jehunonboarding/repository/ResumeRepository.java
@@ -0,0 +1,12 @@
+package com.example.jehunonboarding.repository;
+
+import com.example.jehunonboarding.domain.ResumeEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ResumeRepository extends JpaRepository<ResumeEntity, Long> {
+
+    Optional<ResumeEntity> findByMemberIdAndCompanyId(int memberId, int companyId);
+
+}
diff --git a/src/main/resources/data.sql b/src/main/resources/data.sql
index 58cba22..50728b6 100644
--- a/src/main/resources/data.sql
+++ b/src/main/resources/data.sql
@@ -1 +1,3 @@
 INSERT INTO company (id, company_name, nation, region) VALUES (1, '제훈테크', '한국', '서울');
+
+INSERT INTO member (id, name, email) VALUES (1, '제훈제훈', 'test@test.com');
diff --git a/src/test/java/com/example/jehunonboarding/domain/JobPostingServiceTest.java b/src/test/java/com/example/jehunonboarding/domain/JobPostingServiceTest.java
new file mode 100644
index 0000000..1aa3f49
--- /dev/null
+++ b/src/test/java/com/example/jehunonboarding/domain/JobPostingServiceTest.java
@@ -0,0 +1,86 @@
+package com.example.jehunonboarding.domain;
+
+import com.example.jehunonboarding.repository.CompanyRepository;
+import com.example.jehunonboarding.repository.JobPostingRepository;
+import com.example.jehunonboarding.repository.MemberRepository;
+import com.example.jehunonboarding.repository.ResumeRepository;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class JobPostingServiceTest {
+
+    @InjectMocks
+    private JobPostingService jobPostingService;
+
+    @Mock
+    private JobPostingRepository jobPostingRepository;
+    @Mock
+    private CompanyRepository companyRepository;
+    @Mock
+    private MemberRepository memberRepository;
+    @Mock
+    private ResumeRepository resumeRepository;
+
+    @Test
+    @DisplayName("성공")
+    void testApply() {
+        // given
+        int companyId = 1;
+        int memberId = 1;
+        when(companyRepository.findById(companyId)).thenReturn(Optional.of(new Company()));
+        when(memberRepository.findById(companyId)).thenReturn(Optional.of(new MemberEntity()));
+
+        // when
+        jobPostingService.apply(companyId, memberId);
+
+        // then
+        verify(companyRepository, times(1)).findById(companyId);
+    }
+
+    @Test
+    @DisplayName("회사가 조회되지 않으면 에러 발생")
+    void testApply_NotExistCompany() {
+        // given
+        int companyId = 1;
+        int memberId = 1;
+
+        // when
+        assertThrows(IllegalArgumentException.class, () -> jobPostingService.apply(companyId, memberId));
+    }
+
+    @Test
+    @DisplayName("회원이 조회되지 않으면 에러 발생")
+    void testApply_NotExistMember() {
+        // given
+        int companyId = 1;
+        int memberId = 1;
+        when(companyRepository.findById(companyId)).thenReturn(Optional.of(new Company()));
+
+        // when
+        assertThrows(IllegalArgumentException.class, () -> jobPostingService.apply(companyId, memberId));
+    }
+
+    @Test
+    @DisplayName("이미 지원된 이력서라면 에러 발생")
+    void testApply_AlreadyAppliedResume() {
+        // given
+        int companyId = 1;
+        int memberId = 1;
+        when(companyRepository.findById(companyId)).thenReturn(Optional.of(new Company()));
+        when(memberRepository.findById(companyId)).thenReturn(Optional.of(new MemberEntity()));
+        when(resumeRepository.findByMemberIdAndCompanyId(memberId, companyId)).thenReturn(Optional.of(new ResumeEntity()));
+
+        // when
+        assertThrows(IllegalArgumentException.class, () -> jobPostingService.apply(companyId, memberId));
+    }
+}
\ No newline at end of file