Uber Senior Software Engineer interview questions

The technical interview it is to solve an algorithm, mine in particular was related to choosing the best route possible, it is expected to write code along with asking questions in the process

Worst of experiences ever: I applied online and a recruiter reached out to schedule next steps in mid-July. Scheduled for a Phone Screen in few days after that. This guy shows up for interview and says design rate limiting system. I was like this was supposed to be a coding round. He said this is a coding round but you have to design a rate limiting system. Okay I started to code and asked him what requirements and constraints do you want me to consider. To which he replied, just do whatever you want to. I understand that we are supposed to be creative, but there must be some expectations that a interviewer has from candidates. I just wanted to know what he expects in the solution, and he just kept saying do whatever you want. While coding and walking through the solution, he seemed to be continuing to do his own work. I had to explain him certain lines in the code 2-3 times. This was the most bizarre interview I ever had. Few days later recruiter calls back and says you did well but we need to down-level you. Since you did not live up to the expectations. I was furious at that point, but I accepted it. For next steps she suggested to give her dates for on-site and fill out immigration related details. I did that and couple of days later she called me and said they are no longer hiring within that org. If something else turns up we will let you know. My phone screen results were valid for next six months. This was the most unprofessional experience.