How do you review a design document?

You have an interview on your agenda titled **“Design Doc Review.”** You are given a written design document for a new feature/service (or a major change to an existing system). In the interview, you must review it and give feedback. What process and checklist would you use to review the doc? Include how you would evaluate: - Requirements and scope (functional + non-functional) - Architecture and data flow - Correctness, reliability, security/privacy - Scalability and performance - Operational readiness (monitoring, alerting, on-call, runbooks) - Testing plan and rollout/migration plan - Tradeoffs and open questions