Citadel Securities Software Engineer interview experience

No offer

Hard

Positive

London, EnglandPosted Mar 2026 · Candidate report, summarized by Dataford

My journey began with an initial screening that led into a technical round.

The technical part was heavily focused on problem-solving and coding logic, and I remember it being framed around two DSA questions meant to test both how I reasoned and how I coded.

Coding-wise, I expected to use Python since I’d been clear about being comfortable in that language, but the interviewer on the day expected C++. The question also didn’t feel nicely packaged—there wasn’t something clean and written out, and the way it was described came across a bit scattered, which made it harder to parse and follow precisely. Even so, I had to push through and demonstrate my analytical

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