The Real Reason Uber Skips the Closest Driver!
The obvious move is to grab the nearest car by straight-line distance. Uber doesn't. A car sitting 200 meters away across a river or a highway divider can be 15 minutes by road, so ranking happens by estimated arrival time along real streets, not by dots on a map.
There's a second twist. Requests get collected over a short window and solved as a batch, so the goal becomes the lowest total wait time across every rider, not the best deal for whoever asked first.
The location search itself runs on H3, Uber's hexagonal grid that narrows tens of thousands of drivers down to a few hundred in the cells around you.
Closest on the map or fastest by road, which one should get you? Tell us in the comments.
#SystemDesign #Uber #H3 #distributedsystems #geospatial #backend #softwareengineering #scalability #systemdesigninterview #techexplained #coding #engineering