Apppllp VO 面试真题解析：Talent Listings Service 多渠道发布候选人资料

Imagine you work at a recruitment company and are asked to develop a talent listings service designed to fan out user profiles seeking employment by publishing them across multiple job boards, like Indeed and LinkedIn.

Build a system that enables users to manage their profiles and publish them on various job boards.

Goal / Scope

Build a talent listings service where job seekers manage a profile and publish it to multiple external job boards.

Users & Actors

• Job Seeker: creates or updates a profile, chooses boards, publishes or unpublishes
• Recruiter / Company Admin: configures job-board connectors, views publishing health
• External Job Boards: third-party APIs or webhooks

Core Use Cases

• Create profile
• Preview profile
• Publish to selected boards
• Update sync
• Unpublish
• View status and errors
• Retry failed publishing

Assumptions

• High read traffic for profile previews
• Publishing is async
• External APIs are rate-limited and occasionally flaky

Out of Scope

• Matching or ranking candidates
• Messaging or chat
• Payments
• A full ATS

这道题的核心是设计一个“候选人资料多渠道发布”系统：用户在招聘平台上维护个人资料，并将其异步分发到 Indeed、LinkedIn 等多个外部站点。关键难点不在复杂算法，而在高并发下的系统设计，包括资料元数据与媒体资源分离存储、发布任务队列化、按 profileId 分区保证同一候选人的事件顺序、以及用幂等键和 Redis TTL 去重，避免重试、超时和重复投递带来的脏数据。面试时应重点说明 Profile Service、Publish Service、Message Queue、外部 Board Connector 之间的协作，以及失败重试、状态回查和健康监控的设计。