Multi-priority job queue
Design a multi-priority job queue at scale: 8 priority levels, 200K enqueues/sec, thousands of competing tenants, workers pull the highest-priority ready job. Requirements: high-priority jobs must start within 2s, but no tenant's low-priority work may starve indefinitely, and a single noisy tenant must not monopolize a priority level. Jobs have per-tenant concurrency limits.
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.
Clarify5:00 left
Estimate5:00 planned
Design15:00 planned
Deep dive12:00 planned
Failure8:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.