Architecture

Same Zone, Same Projection, 427 Metres Apart

I was writing a blog post about the architecture of a system I built when I found a bug in it. This is that bug, and the much more interesting thing…

[System Design] H3 Geospatial Indexing: How Uber Finds Nearby Drivers with Hexagonal Spatial Index

The Problem: Finding a Needle in a Haystack Answer-first: Uber and Grab find the nearest available driver in under 100ms by dividing the Earth's sur…

A search engine for places that look alike

I open sourced Similar Earth , a tool that lets you drop a pin anywhere on the planet and find every other place that looks like it. Drop a pin on a…