Citadel Quantitative Researcher interview experience

I ended up interviewing with a fairly large set of people—roughly nine across multiple rounds—and the seniority increased as I moved deeper. The whole thing skewed heavily toward math and problem solving rather than storytelling, and I remember the pace feeling like it was meant to reflect trading environments.

Most of the questions centered on discrete probability and algorithms, with some rounds pushing toward classic “hard” style LeetCode-style challenges. I also had at least one interview where the focus was on doing a lot of thinking in fast bursts; it wasn’t just about arriving at an