Map tile serving system
Design a map-tile serving system that renders and delivers map tiles to a web/mobile mapping product with 500k requests/second globally across 20 zoom levels. Map data (roads, POIs, buildings) updates as the world changes and as editors contribute edits. Cover raster vs vector tiles, the caching/CDN strategy, and how you propagate map data updates without re-rendering the world.
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.