Jane Street interview questions

Received a phone interview right away when i was talking to the campus recruiter. Scheduled a time. The interview was all quantitative with some puzzles. First question is mental math, something like 29x29, then asked me EV questions about rolling dices and some basic stat questions. Fairly simple and effective process

After applying through my college career services, I was awarded a 1:1 interview on campus. I went to the interview dressed in a suit, but the interviewer was dressed very casually (polo shirt and jeans), reflecting the casual work environment at Jane Street. However, it is still advised that you wear a suit. The interview was very cut and dry. First he asked me what I knew about the firm. The purpose of this question was to tailor his short speech about the firm (e.g., so not to tell me stuff I already knew). Honestly, I don't think they care if you had never heard of the firm before walking into the interview; they just want to hire the smartest people they can find. The rest of the interview consisted exclusively of brain teasers: pretty easy ones with progressive difficulty. I got all the brain teasers in this interview, and I was invited to a second interview over the phone. This interview consisted of two fairly difficult brain teasers. I got both of them, but evidently I spent too much time on them (~10 minutes per brain teaser) because I was not invited to the next round.