diff --git a/apps/server-nestjs/src/modules/gitlab/gitlab.service.spec.ts b/apps/server-nestjs/src/modules/gitlab/gitlab.service.spec.ts
index 33b81f4f48..cc935a2e43 100644
--- a/apps/server-nestjs/src/modules/gitlab/gitlab.service.spec.ts
+++ b/apps/server-nestjs/src/modules/gitlab/gitlab.service.spec.ts
@@ -11,7 +11,7 @@ import { OBSERVABILITY_REPOSITORY } from '../observability/observability.constan
 import { VaultClientService } from '../vault/vault-client.service'
 import { GitlabClientService } from './gitlab-client.service'
 import { GitlabDatastoreService } from './gitlab-datastore.service'
-import { makeAccessTokenExposedSchema, makeExpandedUserSchema, makeGroupSchema, makeMemberSchema, makePipeline, makePipelineTriggerToken, makeProjectSchema, makeProjectWithDetails, makeVaultSecret } from './gitlab-testing.utils'
+import { makeAccessTokenExposedSchema, makeExpandedUserSchema, makeGroupSchema, makeMemberSchema, makePipeline, makePipelineTriggerToken, makeProjectSchema, makeProjectWithDetails, makeUser, makeVaultSecret } from './gitlab-testing.utils'
 import { INFRA_APPS_REPO_NAME, MIRROR_REPO_NAME, PLUGIN_NAME, TOPIC_PLUGIN_MANAGED, TOPIC_SYSTEM_MANAGED } from './gitlab.constants'
 import { GitlabService } from './gitlab.service'
 
@@ -55,6 +55,75 @@ describe('gitlabService', () => {
     expect(service).toBeDefined()
   })
 
+  describe('projectMember events', () => {
+    it('should reconcile project members on projectMember.upsert', async () => {
+      const project = makeProjectWithDetails({
+        members: [{ user: { id: 'u1', email: 'member@example.com', firstName: 'New', lastName: 'User', adminRoleIds: [] }, roleIds: [] }],
+      })
+      const group = makeGroupSchema({ id: 123, name: 'project-1', path: 'project-1', full_path: 'forge/console/project-1', full_name: 'forge/console/project-1', parent_id: 1 })
+      datastore.getProject.mockResolvedValue(project)
+      gitlab.getOrCreateProjectSubGroup.mockResolvedValue(group)
+      gitlab.getGroupMembers.mockResolvedValue([])
+      gitlab.upsertUser.mockImplementation(async user => makeExpandedUserSchema({
+        id: user.email === 'member@example.com' ? 999 : 998,
+        email: user.email,
+        username: user.email.split('@')[0] ?? user.email,
+        name: user.name,
+      }))
+
+      const result = await service.handleProjectMemberUpsert({ projectId: project.id, userId: 'u1' })
+
+      expect(result.gitlab.status).toBe('OK')
+      expect(gitlab.addGroupMember).toHaveBeenCalledWith(group, 999, AccessLevel.GUEST)
+      expect(gitlab.addGroupMember).toHaveBeenCalledWith(group, 998, AccessLevel.OWNER)
+    })
+
+    it('should fail with KO when the project no longer exists on projectMember.upsert', async () => {
+      datastore.getProject.mockResolvedValue(null)
+
+      const result = await service.handleProjectMemberUpsert({ projectId: 'missing', userId: 'u1' })
+
+      expect(result.gitlab.status).toBe('KO')
+    })
+
+    it('should remove the group member on projectMember.delete', async () => {
+      const project = makeProjectWithDetails()
+      const group = makeGroupSchema({ id: 321, name: 'project-1', path: 'project-1', full_path: 'forge/console/project-1', full_name: 'forge/console/project-1', parent_id: 1 })
+      datastore.getProject.mockResolvedValue(project)
+      datastore.getUser.mockResolvedValue(makeUser({ id: 'u1', email: 'leaver@example.com' }))
+      gitlab.getUserByEmail.mockResolvedValue(makeExpandedUserSchema({ id: 555, email: 'leaver@example.com', username: 'leaver', name: 'Leaver User' }))
+      gitlab.getProjectGroup.mockResolvedValue(group)
+
+      const result = await service.handleProjectMemberDelete({ projectId: project.id, userId: 'u1' })
+
+      expect(result.gitlab.status).toBe('OK')
+      expect(gitlab.removeGroupMember).toHaveBeenCalledWith(group, 555)
+    })
+
+    it('should tolerate a user absent from GitLab on projectMember.delete', async () => {
+      datastore.getProject.mockResolvedValue(makeProjectWithDetails())
+      datastore.getUser.mockResolvedValue(makeUser({ id: 'u1', email: 'ghost@example.com' }))
+      gitlab.getUserByEmail.mockResolvedValue(null)
+
+      const result = await service.handleProjectMemberDelete({ projectId: 'p1', userId: 'u1' })
+
+      expect(result.gitlab.status).toBe('OK')
+      expect(gitlab.removeGroupMember).not.toHaveBeenCalled()
+    })
+
+    it('should tolerate a missing GitLab group on projectMember.delete', async () => {
+      datastore.getProject.mockResolvedValue(makeProjectWithDetails())
+      datastore.getUser.mockResolvedValue(makeUser({ id: 'u1', email: 'leaver@example.com' }))
+      gitlab.getUserByEmail.mockResolvedValue(makeExpandedUserSchema({ id: 555, email: 'leaver@example.com', username: 'leaver', name: 'Leaver User' }))
+      gitlab.getProjectGroup.mockResolvedValue(undefined)
+
+      const result = await service.handleProjectMemberDelete({ projectId: 'p1', userId: 'u1' })
+
+      expect(result.gitlab.status).toBe('OK')
+      expect(gitlab.removeGroupMember).not.toHaveBeenCalled()
+    })
+  })
+
   describe('handleUpsert', () => {
     it('should reconcile project members and repositories', async () => {
       const project = makeProjectWithDetails()
diff --git a/apps/server-nestjs/src/modules/gitlab/gitlab.service.ts b/apps/server-nestjs/src/modules/gitlab/gitlab.service.ts
index 4af900a9d4..64b5562a4d 100644
--- a/apps/server-nestjs/src/modules/gitlab/gitlab.service.ts
+++ b/apps/server-nestjs/src/modules/gitlab/gitlab.service.ts
@@ -1,6 +1,6 @@
 import type { MemberSchema } from '@gitbeaker/core'
 import type { ConfigType } from '@nestjs/config'
-import type { RepositorySyncEventPayload } from '../events/app-events.service'
+import type { ProjectMemberEventPayload, RepositorySyncEventPayload } from '../events/app-events.service'
 import type { RequiredPluginResult } from '../plugin/plugin.utils'
 import type { MirrorUserSecret, VaultSecret } from '../vault/vault-client.service'
 import type { GroupSchemaWith } from './gitlab-client.service'
@@ -89,6 +89,16 @@ export class GitlabService {
     return capturePluginResult('gitlab', () => this.syncRepositoryMirror(payload))
   }
 
+  @OnEvent('projectMember.upsert')
+  async handleProjectMemberUpsert(payload: ProjectMemberEventPayload): Promise<RequiredPluginResult<'gitlab'>> {
+    return capturePluginResult('gitlab', () => this.syncProjectMembers(payload.projectId))
+  }
+
+  @OnEvent('projectMember.delete')
+  async handleProjectMemberDelete(payload: ProjectMemberEventPayload): Promise<RequiredPluginResult<'gitlab'>> {
+    return capturePluginResult('gitlab', () => this.removeProjectMember(payload))
+  }
+
   @StartActiveSpan()
   private async syncRepositoryMirror(payload: RepositorySyncEventPayload) {
     const { projectSlug, internalRepoName, syncAllBranches } = payload
@@ -120,6 +130,49 @@ export class GitlabService {
     this.logger.log(`GitLab cleanup completed for project ${project.slug}`)
   }
 
+  @StartActiveSpan()
+  private async syncProjectMembers(projectId: string) {
+    const span = trace.getActiveSpan()
+    span?.setAttribute('project.id', projectId)
+    this.logger.log(`Handling a project member upsert event (projectId=${projectId})`)
+    const project = await this.datastore.getProject(projectId)
+    if (!project) {
+      throw new Error(`Project not found for member sync (projectId=${projectId})`)
+    }
+    const group = await this.gitlab.getOrCreateProjectSubGroup(project.slug)
+    const members = await this.gitlab.getGroupMembers(group)
+    await this.ensureProjectGroupMembers(project, group, members)
+    this.logger.log(`GitLab member sync completed (projectId=${projectId}, slug=${project.slug})`)
+  }
+
+  @StartActiveSpan()
+  private async removeProjectMember(payload: ProjectMemberEventPayload) {
+    const span = trace.getActiveSpan()
+    span?.setAttribute('project.id', payload.projectId)
+    span?.setAttribute('project.member.userId', payload.userId)
+    this.logger.log(`Handling a project member delete event (projectId=${payload.projectId}, userId=${payload.userId})`)
+    const user = await this.datastore.getUser(payload.userId)
+    if (!user) {
+      throw new Error(`User not found for member removal (userId=${payload.userId})`)
+    }
+    const project = await this.datastore.getProject(payload.projectId)
+    if (!project) {
+      throw new Error(`Project not found for member removal (projectId=${payload.projectId})`)
+    }
+    const gitlabUser = await this.gitlab.getUserByEmail(user.email)
+    if (!gitlabUser) {
+      this.logger.log(`User absent from GitLab, nothing to remove (projectId=${payload.projectId}, userId=${payload.userId})`)
+      return
+    }
+    const group = await this.gitlab.getProjectGroup(project.slug)
+    if (!group) {
+      this.logger.log(`No GitLab group for project, nothing to remove (projectId=${payload.projectId}, slug=${project.slug})`)
+      return
+    }
+    await this.gitlab.removeGroupMember(group, gitlabUser.id)
+    this.logger.log(`GitLab member removed (projectId=${payload.projectId}, gitlabUserId=${gitlabUser.id})`)
+  }
+
   // @Cron(CronExpression.EVERY_HOUR)
   @StartActiveSpan()
   async handleCron() {