It was an on-campus interview and I was interviewed by two people separately, each session lasting roughly half an hour. The interviewers were gracious and the conversations with them were pretty pleasant. However, they asked several questions in probability theory, which might be too difficult to me. They seemed to care more about creative intuition and rigorous thinking.

Interviewed out of phd program. They try to pair you up with researchers who have similar academic backgrounds, at least in the first few rounds. They seem interested in hearing about your research, but probably wise to stress those aspects that are relevant to quant finance if possible (coding, stats, automation).