Indeed flew me down to Austin, with all expenses paid. On the first day, we had dinner and an opportunity to chat with some engineers from the company. The next day, we arrived at the office at 8 AM and began with some presentations. Following that, there were three one-hour whiteboard interviews with different engineers. After the interviews, we had lunch, then a 90-minute coding exercise. The day concluded with more presentations.

I can't get into specifics because of the NDA, but they were all what I would expect. Know your data structures and how to analyze runtime efficiency.