Phone interview, followed by an on-campus interview. The real meat, however, was in the on-location interview.

Essentially, from 8 AM to 5 PM, I met with various current employees of different ranks on the team I was going to join. The questions covered standard conversation topics, probed the depths of my understanding of certain problems, included standard algorithm-focused coding interviews, and even presented some pure brainteaser questions.

I mentioned I had done AI for a video game. I told them I used A* for pathfinding, but when they probed me on it, I admitted I had used a library implementation and didn't understand the algorithm in detail. I was then tasked with trying to derive it, knowing that it essentially boils down to Dijkstra's shortest path algorithm plus a bias.