Citadel Securities Quant Trading Intern interview questions

Several phone screens with traders and then a superday. Traders ask lots of questions about markets and EV and probability--similar to any other firm. I personally thought the interviewers were quite nice, though this depends on team.

Contacted via campus recruiter for my university. One initial phone round with 2 quantitative questions, one final round with 4 separate interviews ranging from IMO-style to programmatic. Had a good experience overall, some of the interviewers seemed a bit unhappy to be a part of the process, however.