Hint 1 — locked

Hint 2 — locked

Hint 3 — locked

Problem

Build the backend of a ride-sharing platform. Riders request trips, the system finds nearby available drivers and matches them, tracks GPS locations in real time, and streams live location updates back to both rider and driver during the trip. The system must be highly available globally.

Functional Requirements

• Rider requests a ride; system finds and matches the nearest available driver
• Real-time GPS location updates from drivers (every 4 seconds)
• Stream live driver location to rider's app during the trip
• Calculate estimated arrival time and fare based on route
• Support surge pricing based on supply/demand ratios

Non-Functional

• 10M daily active riders, 3M active drivers globally
• Location updates processed in < 500 ms end-to-end
• Driver matching latency < 2 seconds from request to match
• Geospatial queries must scale to city-level density (10k drivers per km²)