The entire process is ridiculous and designed for attracting arrogant brogrammers. Each of the people who I interviewed with was an a-hole (this was not a single occurrence) but the worst was the treatment by the hiring recruiter -- lies throughout the process, lack of transparency, and just straight up lack of ethics (he even gave dirt on the company trying to downplay the previous management). If Uber wants to succeed, they need to make a wholesale cleanout of their staff and not just their top management. Not one of the people interviewing seemed to have any depth of real experience, and the attitudes by the product managers specifically was completely prickish.
I stuck out the entire process (3 months) just to prove I could get the role, but after each stage, I was more sure that I was not going to ever accept going. The new CEO does make it tempting, but I don't see any indicators that they are going to get rid of the rank and file goofs who seems to be throughout the company. (overall, I interviewed with about 13 people (not including HR). 10 of those were in person. They also asked for a project up front, which I didn't mind doing because it was interesting but was ticked that it played zero during the actual interview. During the interviews, timing was always off (went 2 hours longer past 5pm than originally planned on my first site visit), people did not show up three times leaving me just sitting there. During one of those times, I just stood up and walked around the building which makes feel great about their sense of security, and only 3 of the interviewers seem to have actually done any preparation. Their 'jam session' is a complete lie - it is just an interview with more than one person, both of whom had did not seem to have any preparation done. There was no 'jamming' -- no collaboration of ideas or joint development of solutions. It was just two people asking random questions which seemed to reflect the stupidity of PMs who have never developed anything before.
If you get an offer to interview at Uber. Don't do it unless you are really early in your career and want a name brand, or you are desperate. This is not a place to go if you have skills and want to work with either people you will learn from, or people who seem open to working with others.