It was a Data Scientist position at the Marketplace Optimization Data Science team. Contacted by recruiter. First a phone screen with a Senior Data Scientist going over problem solving, stats/math etc, followed by a take-home data science exercise, and finally invited to on-site with 6 back to back interviews. Didn't get the offer as I was in a pretty bad shape during that day and should have asked to reschedule instead. The interview questions were among the most difficult and quantitative but if you practice your advanced probability and modeling you should do fine. The people at Uber were amazing and I can truly felt that I'll be working with a stellar team if I could've got in. The interviewers will grill you in every way possible but they were never hostile, always on point and reasonable. Everyone was professional from the recruiter to the hiring manager and the overall experience was pleasant. The only downside is that the onsite schedule seemed a bit rushed with 6 back-to-back interviews with hardly any breaks in between, but probably also tells you how fast-paced Uber is.