Citadel Securities Software Engineer interview experience

No offer

Hard

Neutral

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

The interview process felt long and structured around three separate 45-minute interviews.

In those sessions, I kept getting hit with a lot of coding-focused prompts rather than just a single assessment.

Across the three rounds, the variety was what surprised me: I saw questions spanning system-design thinking, writing production-level code, and also LeetCode-style problems. It wasn’t just about solving one algorithm; it was more like they wanted to see how I approached different kinds of engineering tasks back to back.

I didn’t end up with an offer. Still, the overall impression was that the bar was consistent and the process was designed to stress both breadth and depth. The

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