30 min 1:1 initial interview on campus consisting of a few minutes of banter about my resume followed by a bunch of relatively simple mental math and probability questions. 2nd and 3rd round phone interviews were similar, but fewer and more difficult questions were asked; both general logic/brainteasers and probability questions (coin flips and dice rolls). No finance or fit questions as expected. After each answer you give they ask how confident you are (in rounds 2 and 3 only). Interviewers were courteous and seemed like they would be good people to work with.

I applied through my university and heard back soon after the application had closed. There was very little chit-chat over the course of the interview; most of it was simply the guy asking me math/probability questions. This was actually my first ever interview, and I wasn't really expecting it, so it threw me off a little.