Citadel Securities Software Engineer interview experience

Posted Feb 2026 · Candidate report, summarized by Dataford

My process featured a stock-trading style coding question that felt very “best time to buy and sell stock” themed.

The question I got was obfuscated, but the intent was clearly the same, and it was set up as a single main problem rather than a long chain of tasks.

After seeing the prompt, I worked through it as a standard dynamic-programming / optimization style problem—figuring out the right way to represent the state and compute the maximum profit efficiently. It wasn’t described as a systems exercise; it was all about getting the logic right and producing correct output within the assessment constraints.

I ended up not receiving an offer after that round of the process. Overall, it felt like a

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