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Design the ride-matching system that pairs riders with nearby drivers in real time.

A rider taps request and within seconds a nearby driver is assigned. The interesting problems are geospatial indexing of moving drivers, the matching objective (nearest is not always best), and handling the race where two riders want the same car. Here is how to build it.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A rider taps request and within seconds a nearby driver is assigned. The interesting problems are geospatial indexing of moving drivers, the matching objective (nearest is not always best), and handling the race where two riders want the same car. Here is how to build it.

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Next in this trackDesign a payment ledger that records money movement with exactly-once semantics and no lost cents.Next in this trackDesign a distributed cache like Redis or Memcached that serves millions of reads per second.Next in this trackDesign a time-series database that ingests millions of metrics per second and answers range queries fast.
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