diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java b/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
index d38b5ef..142ca9c 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/controller/MemberController.java
@@ -3,6 +3,8 @@
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import org.sopt.seonyakServer.domain.member.dto.LoginSuccessResponse;
+import org.sopt.seonyakServer.domain.member.dto.MemberJoinRequest;
+import org.sopt.seonyakServer.domain.member.dto.MemberJoinResponse;
 import org.sopt.seonyakServer.domain.member.dto.NicknameRequest;
 import org.sopt.seonyakServer.domain.member.dto.SendCodeRequest;
 import org.sopt.seonyakServer.domain.member.dto.VerifyCodeRequest;
@@ -10,6 +12,7 @@
 import org.sopt.seonyakServer.domain.member.service.MessageService;
 import org.sopt.seonyakServer.global.common.external.client.dto.MemberLoginRequest;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PatchMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -32,6 +35,13 @@ public ResponseEntity<LoginSuccessResponse> login(
         return ResponseEntity.ok(memberService.create(authorizationCode, loginRequest));
     }
 
+    @PatchMapping("/auth/join")
+    public ResponseEntity<MemberJoinResponse> join(
+            @RequestBody final MemberJoinRequest memberJoinRequest
+    ) {
+        return ResponseEntity.ok(memberService.patchMemberJoin(memberJoinRequest));
+    }
+
     @PostMapping("/nickname")
     public ResponseEntity<Void> validNickname(
             @Valid @RequestBody final NicknameRequest nicknameRequest
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinRequest.java b/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinRequest.java
new file mode 100644
index 0000000..3c0df68
--- /dev/null
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinRequest.java
@@ -0,0 +1,20 @@
+package org.sopt.seonyakServer.domain.member.dto;
+
+import java.util.List;
+
+public record MemberJoinRequest(
+        String role,
+        Boolean isSubscribed,
+        String nickname,
+        String image,
+        String phoneNumber,
+        String univName,
+        String field,
+        List<String> departmentList,
+        String businessCard,
+        String company,
+        String position,
+        String detailPosition,
+        String level
+) {
+}
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinResponse.java b/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinResponse.java
new file mode 100644
index 0000000..2eb9dd6
--- /dev/null
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/dto/MemberJoinResponse.java
@@ -0,0 +1,9 @@
+package org.sopt.seonyakServer.domain.member.dto;
+
+public record MemberJoinResponse(
+        String role
+) {
+    public static MemberJoinResponse of(final String role) {
+        return new MemberJoinResponse(role);
+    }
+}
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/model/Member.java b/src/main/java/org/sopt/seonyakServer/domain/member/model/Member.java
index ec7af22..27138e2 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/model/Member.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/model/Member.java
@@ -11,10 +11,13 @@
 import jakarta.persistence.Id;
 import jakarta.persistence.OneToOne;
 import jakarta.persistence.Table;
+import java.util.List;
 import lombok.AccessLevel;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
+import org.hibernate.annotations.JdbcTypeCode;
+import org.hibernate.type.SqlTypes;
 import org.sopt.seonyakServer.domain.senior.model.Senior;
 import org.sopt.seonyakServer.global.common.model.BaseTimeEntity;
 
@@ -57,8 +60,9 @@ public class Member extends BaseTimeEntity {
     @Column(name = "field")
     private String field;
 
-    @Column(name = "department")
-    private String department;
+    @Column(name = "departmentList", columnDefinition = "jsonb")
+    @JdbcTypeCode(SqlTypes.JSON)
+    private List<String> departmentList;
 
     @OneToOne(mappedBy = "member", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
     private Senior senior;
@@ -85,4 +89,36 @@ public static Member create(
                 .email(email)
                 .build();
     }
+
+    public void updateMember(
+            Boolean isSubscribed,
+            String nickname,
+            String image,
+            String phoneNumber,
+            String univName,
+            String field,
+            List<String> department
+    ) {
+        if (isSubscribed != null) {
+            this.isSubscribed = isSubscribed;
+        }
+        if (nickname != null) {
+            this.nickname = nickname;
+        }
+        if (image != null) {
+            this.image = image;
+        }
+        if (phoneNumber != null) {
+            this.phoneNumber = phoneNumber;
+        }
+        if (univName != null) {
+            this.univName = univName;
+        }
+        if (field != null) {
+            this.field = field;
+        }
+        if (department != null) {
+            this.departmentList = department;
+        }
+    }
 }
diff --git a/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java b/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
index 94cca73..8aaa5f9 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/member/service/MemberService.java
@@ -2,11 +2,15 @@
 
 import lombok.RequiredArgsConstructor;
 import org.sopt.seonyakServer.domain.member.dto.LoginSuccessResponse;
+import org.sopt.seonyakServer.domain.member.dto.MemberJoinRequest;
+import org.sopt.seonyakServer.domain.member.dto.MemberJoinResponse;
 import org.sopt.seonyakServer.domain.member.dto.NicknameRequest;
 import org.sopt.seonyakServer.domain.member.model.Member;
 import org.sopt.seonyakServer.domain.member.model.SocialType;
 import org.sopt.seonyakServer.domain.member.repository.MemberRepository;
+import org.sopt.seonyakServer.domain.senior.service.SeniorService;
 import org.sopt.seonyakServer.global.auth.MemberAuthentication;
+import org.sopt.seonyakServer.global.auth.PrincipalHandler;
 import org.sopt.seonyakServer.global.auth.jwt.JwtTokenProvider;
 import org.sopt.seonyakServer.global.common.external.client.dto.MemberInfoResponse;
 import org.sopt.seonyakServer.global.common.external.client.dto.MemberLoginRequest;
@@ -15,6 +19,7 @@
 import org.sopt.seonyakServer.global.exception.model.CustomException;
 import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 @Service
 @RequiredArgsConstructor
@@ -22,8 +27,10 @@ public class MemberService {
 
     private final MemberRepository memberRepository;
     private final JwtTokenProvider jwtTokenProvider;
+    private final PrincipalHandler principalHandler;
     private final GoogleSocialService googleSocialService;
     private final MemberManagementService memberManagementService;
+    private final SeniorService seniorService;
 
     private static final String NICKNAME_PATTERN = "^[a-zA-Z0-9가-힣]{2,8}$";
 
@@ -101,4 +108,27 @@ public void validNickname(final NicknameRequest nicknameRequest) {
             throw new CustomException(ErrorType.NICKNAME_DUP_ERROR);
         }
     }
+
+    @Transactional
+    public MemberJoinResponse patchMemberJoin(MemberJoinRequest memberJoinRequest) {
+        Member member = memberRepository.findMemberByIdOrThrow(principalHandler.getUserIdFromPrincipal());
+
+        member.updateMember(
+                memberJoinRequest.isSubscribed(),
+                memberJoinRequest.nickname(),
+                memberJoinRequest.image(),
+                memberJoinRequest.phoneNumber(),
+                memberJoinRequest.univName(),
+                memberJoinRequest.field(),
+                memberJoinRequest.departmentList()
+        );
+
+        memberRepository.save(member);
+
+        if (memberJoinRequest.role().equals("SENIOR")) {
+            return MemberJoinResponse.of(seniorService.createSenior(memberJoinRequest, member));
+        }
+
+        return MemberJoinResponse.of(memberJoinRequest.role());
+    }
 }
diff --git a/src/main/java/org/sopt/seonyakServer/domain/senior/service/SeniorService.java b/src/main/java/org/sopt/seonyakServer/domain/senior/service/SeniorService.java
index 3f958c3..7ed3381 100644
--- a/src/main/java/org/sopt/seonyakServer/domain/senior/service/SeniorService.java
+++ b/src/main/java/org/sopt/seonyakServer/domain/senior/service/SeniorService.java
@@ -2,6 +2,8 @@
 
 import java.util.List;
 import lombok.RequiredArgsConstructor;
+import org.sopt.seonyakServer.domain.member.dto.MemberJoinRequest;
+import org.sopt.seonyakServer.domain.member.model.Member;
 import org.sopt.seonyakServer.domain.senior.dto.SeniorListResponse;
 import org.sopt.seonyakServer.domain.senior.dto.SeniorProfileRequest;
 import org.sopt.seonyakServer.domain.senior.model.PreferredTimeList;
@@ -20,6 +22,23 @@ public class SeniorService {
     private final SeniorRepository seniorRepository;
     private final PrincipalHandler principalHandler;
 
+    @Transactional
+    public String createSenior(final MemberJoinRequest memberJoinRequest, Member member) {
+
+        Senior senior = Senior.createSenior(
+                member,
+                memberJoinRequest.businessCard(),
+                memberJoinRequest.detailPosition(),
+                memberJoinRequest.company(),
+                memberJoinRequest.position(),
+                memberJoinRequest.level()
+        );
+
+        seniorRepository.save(senior);
+
+        return memberJoinRequest.role();
+    }
+
     @Transactional
     public void patchSeniorProfile(SeniorProfileRequest seniorProfileRequest) {
         Senior senior = seniorRepository.findSeniorByMemberId(principalHandler.getUserIdFromPrincipal())