I had two one-hour phone screens followed by an in-person interview. The phone screens were fairly rigorous and included a FizzBuzz. The interviewers were friendly and professional, and they squeezed a lot of questions into the hour.

I received feedback within 48 hours of the first interview. After the second interview, I was told they would bring me in for an in-person interview as soon as the hour ended.

Afterwards, they told me that they had high failure rates for the in-person interview, so they instituted a new process of requiring two phone screens instead of one and shortening the in-person interview from six hours to four. I don't know if this is company-wide, but I like the system.

The in-person interview was a combination of panel interviews (e.g., two engineers asking me questions) and one-on-one sessions with more senior people. They asked questions specific to the domain knowledge on my resume, as well as some general questions specific to their own environment. There were also some algorithm questions/problems.

Most of the time, I was on my feet at the whiteboard. The interview was very thorough, and no inappropriate questions were asked. Some of the questions/puzzles were quite creative, and I enjoyed working through them. I had a great time and wished the interview would last a bit longer, as the puzzles were interesting and had multiple levels and/or multiple solutions. I think part of the interview process was to see how far you could get in the time allotted.

The route-finding problem for a robot that cannot store internal variables.