Citadel Securities Software Engineer interview experience

No offer

Hard

Positive

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

I went through Citadel Securities’ initial screening, and it was built around data structure questions.

The topics included trees and graphs, which made it feel like they were testing core DSA comfort.

The difficulty was described as medium. It wasn’t presented as a puzzle-heavy environment, more like a structured evaluation of whether I could model the problem using the right data structures and write correct solutions.

I didn’t end up getting an offer. Overall it felt like a legitimate first filter: if the data structure foundations were shaky, it would show quickly.

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