There were two major rounds of interviews. In the first one, I was asked and interviewed by the team on the field in general on various topics; it feels like a Ph.D. exam. It was rigorous, and challenging, but informative. In the second one, I gave a presentation and went through five hours of interview with a couple of short breaks in between. The questioning was intense but the team was nice, curious, intellectually challenging, and we had some nice discussions and I had a good vibe from them.