I was given a 30-minute phone interview during which I answered most of the questions (I missed one or two). Two days later I received an email request asking me to do a "homework assignment" within 7 days. I completed and submitted it on the fifth day (took my time in doing so) and was notified the next morning that I was invited to their office for interviews. I was offered Uber credits to get me to-and-from the location but did not manage to use them successfully, as I was unfamiliar with the product before the interviews took place. I arrived at 11am and did four hour-long interviews with engineers from various teams, including one who is now my manager. Two interviewers merely wanted to get to know me and get a sense of my experience, seeing if I was a fit for their team. These interviews were mutual conversations where their experiences sold me on whether or not I wanted to work here. The other two interviews were largely conversational, but with one technical question each. After some back-and-forth work, I managed to solve both problems reasonably and left the interviews feeling confident. I was told the next day that I would be made an offer based on my experience (but had not yet been made the offer). Unfortunately, I was then told that a upper-level management felt my interviews had been not technical enough, and that I had to have one more technical interview (ugh!). Two days later, I traveled to their office again and had my final interview where I was asked the question below about defining, storing, and retrieving structs. Ultimately I had a good experience, where it paid to know my domain thoroughly. Uber ATG's interview process was formal but with an informal/personal feeling to it, only marred by some disorganization that I am now trying to help them resolve for future interviewees.