Uber Senior Data Scientist interview questions

First recruiter reached out to me and we chatted, then general chat with hiring manager which went very well. Next was technical phone screen which was challenging and very stats oriented. Apparently, there were some "concerns" but they still wanted to move forward and give me an exam. After this I got a ridiculously long take home exam, I spent literally 10-12 hours working intensely on it, but easily could have spent much more and I am somebody that can work quickly. The 3 sections were all reasonable but just was a lot to ask. After turning it in, I heard back from the recruiter that said I scored very well on it (apparently they send the test to a separate Data Scientist outside the team you interview with to grade it). I was happy to hear this and expected to be called in for the final round in-person interviews. But then the recruiter told me that the hiring manager wanted to chat with me again on the phone. I agreed and expected a chat about the test I turned in or perhaps just more background on what the role would be and whether it made sense for me to go in for the in-person final round. Instead, after telling me he hadn't seen my exam nor the score for it and proceeded to give me ANOTHER technical phone screen which I was NOT expecting. I was annoyed but still tried to answer the questions but it did not go smoothly. I then heard back 2 weeks later that they did not want to move forward. Think very carefully about whether you want to invest the time in doing the take home exam. Overall, a terrible experience.

First got referred by a friend's friend. Then got an phone call with a recruiter. She asked me about my interest and introduced the team. Then got a take-home exercise. Some practical problems Uber is facing. 3 Problems. Turned it in one week then got rejected. I wrote a 8 pages report.