Tag: geohash

All the articles with the tag "geohash".

• I built Uber's backend. Then one driver got 59 riders

  24 Oct, 2026

  Part 2 of a ride-hailing backend on kind: 10,000 drivers and 6,000 riders in an Istanbul-sized city push three Go pods to their CPU limit, a Redis geo index (GEOADD, GEOSEARCH) halves the work and fills the map again, and a check-then-set race hands one driver 59 riders until SET NX fixes it. Every manifest, command and number.