In this job, you’ll be part of a team of software engineers, sensing the points of interest on the map that devices visit. You’ll contribute to new and improved user experiences, in partnership with teams in sensing, Siri, and apps. Hungry for the responsibility to work on complex problems from end to end? You’ll design, build, and evaluate production algorithms and software systems to infer the place a device is at, using multiple sensors—GPS, WiFi, accelerometer, and others—and a combination of estimation and ML techniques. You’ll test your work, dogfood it, collect metrics, and iterate. Don’t forget to sweat the edge cases—an issue that impacts a couple percent of a couple billion devices is a big issue.