Quant Intern

I recently completed the interview process for a quant intern position at Citadel and wanted to share my experience. Overall, it was a solid but challenging process that felt fairly typical for a top-tier hedge fund.
I had two technical interviews, each about 60 minutes. The first focused on probability and statistics problems. I got a question about Bayes' theorem applied to a practical scenario, which I handled decently but didn't nail completely. There was also a brainteaser-style problem that required some creative thinking.
The second technical round included coding. They had me write code to solve an algorithmic problem on a shared editor. It wasn't overly difficult, but there was definitely pressure to write clean, efficient code. I made a minor optimization error that the interviewer pointed out, which felt a bit humbling. Got rejected after.