Citadel·Quantitative Researcher

Citadel Quantitative Researcher interview experience

No offer

Medium

Positive

London, EnglandPosted Sep 2025 · Candidate report, summarized by Dataford

I had a 45-minute interview that broke down into a short CV check and then a math-heavy block.

The questions included linear regression plus regularization topics like lasso and ridge, and there was also optimization involved. A lot of the difficulty came from calculus-style and linear algebra concepts combined with probability.

It felt “easy” in the sense that the pacing and structure didn’t feel chaotic, but the questions themselves were tricky. I remember thinking I could see where the problems were going, yet the details were the part that could trip me up. After the session, I left with a clearer sense that being comfortable with the basics wasn’t the same as being fully precise

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