Trip history and trajectory replay
Design the trip-history and trajectory-replay storage backend for a fleet/AV platform retaining 2 years of per-second GPS for 1M vehicles (~63B points/vehicle-year). Users replay any trip on a map, scrub the timeline, and run analytics like 'time spent in zone X' or 'all trips passing through area Y'. Cover the storage layout, compression, and how spatial+temporal queries stay fast over this volume.
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.