System Requirements
- Process 1.25M GPS location pings per second with < 500ms lag
- Geospatial lookup: find nearest 10 available drivers within 3km in < 15ms
- ETA graph pathfinding considering historical and live traffic congestion
- Atomic lock on driver matching to prevent race conditions across riders
Graded Constraints
01Budget limit: $25,000/month
02Persistent WebSocket / TCP connections for driver location streams
03High-throughput message streaming buffer (Kafka)
04In-memory spatial index (Redis Geospatial / memory store)
05Transactional DB for ride state and payment settlement
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