System design interview question
"Design Uber. Riders request a ride, the system finds a nearby driver and matches them, then both track each other in real time until drop-off. 5 million drivers, 20 million rides a day."
spatial indexing over moving objects plus distributed matching under contention. Three distinct hard parts: (1) indexing millions of continuously-moving drivers so you can query "who is near this point", (2) matching without double-assigning a driver, and (3) the real-time tracking connection. It is the canonical geo question — the bar is high because it is so frequently asked.
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