On Twitter, Microsoft employee Joshua Debner shared screenshots of an in-app experience he had while taking an Uber ride. It asked Debner to answer some fairly routine interview-type questions. All of the questions related to development, and Debner was even offered a chance to follow-up with Uber after his ride.
It’s not clear how Uber knew Debner was in any way involved with coding (his Uber trip was from home to a wine bar, so it’s not destination endpoints). Perhaps Uber is scraping recruitment sites using an email, then cross-referencing it to profile email addresses.