diff --git a/src/main/kotlin/com/hero/alignlab/domain/dev/model/request/DevGroupJoinRequest.kt b/src/main/kotlin/com/hero/alignlab/domain/dev/model/request/DevGroupJoinRequest.kt
new file mode 100644
index 0000000..a2cf5bf
--- /dev/null
+++ b/src/main/kotlin/com/hero/alignlab/domain/dev/model/request/DevGroupJoinRequest.kt
@@ -0,0 +1,6 @@
+package com.hero.alignlab.domain.dev.model.request
+
+data class DevGroupJoinRequest(
+    val uid: Long,
+    val joinCode: String? = null
+)
diff --git a/src/main/kotlin/com/hero/alignlab/domain/dev/resource/DevGroupResource.kt b/src/main/kotlin/com/hero/alignlab/domain/dev/resource/DevGroupResource.kt
new file mode 100644
index 0000000..f9aa3ed
--- /dev/null
+++ b/src/main/kotlin/com/hero/alignlab/domain/dev/resource/DevGroupResource.kt
@@ -0,0 +1,31 @@
+package com.hero.alignlab.domain.dev.resource
+
+import com.hero.alignlab.config.dev.DevResourceCheckConfig.Companion.devResource
+import com.hero.alignlab.config.swagger.SwaggerTag.DEV_TAG
+import com.hero.alignlab.domain.dev.model.request.DevGroupJoinRequest
+import com.hero.alignlab.domain.group.application.GroupFacade
+import io.swagger.v3.oas.annotations.Operation
+import io.swagger.v3.oas.annotations.tags.Tag
+import org.springframework.http.MediaType
+import org.springframework.web.bind.annotation.*
+
+@Tag(name = DEV_TAG)
+@RestController
+@RequestMapping(produces = [MediaType.APPLICATION_JSON_VALUE])
+class DevGroupResource(
+    private val groupFacade: GroupFacade,
+) {
+    @Operation(summary = "그룹 조인하기")
+    @PostMapping("/api/dev/v1/groups/{groupId}/join")
+    suspend fun joinGroup(
+        @RequestHeader("X-HERO-DEV-TOKEN") token: String,
+        @PathVariable groupId: Long,
+        @RequestBody request: DevGroupJoinRequest,
+    ) = devResource(token) {
+        groupFacade.joinGroup(
+            groupId = groupId,
+            uid = request.uid,
+            joinCode = request.joinCode
+        )
+    }
+}
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
index da26a46..851ce89 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
@@ -107,10 +107,18 @@ class GroupFacade(
         user: AuthUser,
         groupId: Long,
         joinCode: String?
+    ): JoinGroupResponse {
+        return joinGroup(groupId, user.uid, joinCode)
+    }
+
+    suspend fun joinGroup(
+        groupId: Long,
+        uid: Long,
+        joinCode: String?
     ): JoinGroupResponse {
         return parZip(
             { groupService.findByIdOrThrow(groupId) },
-            { groupUserService.findAllByUid(user.uid).associateBy { it.groupId } }
+            { groupUserService.findAllByUid(uid).associateBy { it.groupId } }
         ) { group, groupUsers ->
             if (group.isHidden && group.joinCode != joinCode) {
                 throw InvalidRequestException(ErrorCode.IMPOSSIBLE_TO_JOIN_GROUP_ERROR)
@@ -137,7 +145,7 @@ class GroupFacade(
                 else -> {
                     val createdGroupUser = txTemplates.writer.executes {
                         groupService.saveSync(group.apply { this.userCount += 1 })
-                        groupUserService.saveSync(groupId, user.uid)
+                        groupUserService.saveSync(groupId, uid)
                     }
 
                     JoinGroupResponse(