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Citadel Securities Interview Experiences
3935 interview stories from candidates at 857 companies: how each round went, what was asked and how it ended. Every company page links to practice questions in the same style.
- 3935
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3 results
- I Built a Transformer When a Decision Tree Would Do, Then Got GhostedCitadel Securities · Research Engineer · Technical Screen · Sep 2026No response
I work in tech. Every time I get ready to switch jobs, a pile of workload drags me back, so I just kind of go with the flow. Three months ago (I had 4.5 YOE at the time), a recruiter reached out saying some trading companies could do 3-days-a-week hybrid in Florida. Then the team they actually lined up didn't match the pitch lol, they said it was New York only. I wasn't that interested and honest…
- Lock-Free Producer-Consumer, Currency Arbitrage, and an Order BookCitadel Securities · Software Engineer · Onsite · Sep 2026
Implement a threaded producer-consumer, optimize from a mutex and then a spin lock. A list of currency conversions: determine if an arbitrage opportunity exists. Find the sequence of conversions to make money. Implement an order book data structure: maintain the order of incoming ask/bid/qty price, aggregate. Cancel an order without impacting other orders. Implement a smart queue: maintain the or…
- Trade Data and Timestamp PrecisionCitadel Securities · Software Engineer · Technical Screen · Sep 2026Rejected
The author reports a Citadel Securities process with an initial recruiter screen and two technical interviews, without an online assessment. A New York team lead conducted a one-hour session involving trade reconciliation, behavioral questions, and design follow-ups. A London lead then held a longer-than-scheduled interview combining another trade-data task with detailed resume discussion. The ac…
