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MediumPrep Room Coding #3263

Fleet management backend

System designDistributed systemsMid–Senior~40 min

Design a commercial fleet-management backend tracking 500k vehicles, each reporting telematics (location, speed, fuel, engine diagnostics) every 10 seconds. The product offers a live map of all vehicles, per-vehicle history, and rules-based alerts (speeding, harsh braking, geofence breach, idle too long). Cover ingestion, the live map at scale, and rule evaluation.

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.

Clarify4:30 left
Estimate4:30 planned
Design13:30 planned
Deep dive10:30 planned
Failure7:00 planned
0:00
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.