Citadel Securities Software Engineer interview experience

No offer

Hard

Neutral

New York, NYPosted Jul 2025 · Candidate report, summarized by Dataford

My process started with a recruiter screen, followed by a technical coding challenge.

The technical challenge had OS trivia plus a LeetCode medium-style problem.

After that, I went to an onsite with five interviews covering a pretty wide range: system design, LeetCode, cultural fit, multithreading, networking, and OS. It felt like a full sweep of topics, and I tried to bring solid reasoning to each one.

I ended up failing, and what I remember most was making mistakes in both the networking and the LeetCode parts. I felt like I could’ve been more confident with low-latency networking experience, and that gap showed during the onsite.

No offer came out of it. Looking back, it

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Citadel Securities Software Engineer interview experience (2025) | Dataford