System designHardsd-g279

Subject Real time systemsLevel Senior–Staff~50 minCommon in Databases & SQL · Distributed systems interviewsIndustries Technology

Question

Design the real-time location-tracking and matching system for a ride-hailing / delivery platform. 2M drivers send GPS pings every 4 seconds; riders request a ride and must be matched to a nearby available driver within ~1 second; riders also watch their matched driver's marker move live on a map. The 'find nearest available drivers' query runs constantly and must be fast over a moving 2M-point set. How do you index moving locations, run proximity matching at scale, and stream the live driver position to the rider?

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.

Learn the concepts

Narrate your design

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Run or narrate your approach, then ask the coach.