The design library
Building blocks, complete architectures, and variations worth comparing. Search by the problem you want to solve or a component you want to understand.
Classic designOfficial
Rank upcoming events when every event is new and expires: geo and time candidates, live features, calibrated ranking, a two-sided market: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Count 4 million moving drivers per map cell from a million pings a second, and serve the density to a million viewers as cached map tiles: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Radius, k-nearest and map-box search over places that rarely move and drivers that ping every few seconds: R-trees, geohash, H3 and S2 cells, Redis GEO and OpenSearch. One-hour boards for junior, senior and staff, with the theory.
Classic designOfficial
Search 10 million businesses by place, words and category, keep every average rating exact, and keep fake reviews out: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Price a trip, match a rider to a nearby driver who has ten seconds to accept, and never give one driver two rides: one-hour boards for junior, senior and staff, with the theory behind them.
Building blockOfficial
Positions written to a cell-based index with a short expiry, so "who is near me" is a small read and anything that stops reporting disappears on its own.