Citadel Securities Quantitative Trader interview experience

No offer

Medium

Positive

Philadelphia, PAPosted Oct 2024 · Candidate report, summarized by Dataford

My interviews felt pretty standard on paper, but the details depended heavily on the day.

I first did a quick behavioral conversation, then it turned into probability questions immediately.

I ended up with a big probability problem that ate the entire time. It required a law-of-total-probability style approach plus some careful edge-case work to end up with an infinite geometric series. The contrast was striking: I later heard friends describe versions that involved a shorter Bayes-rule question followed by market-making style gameplay, but my own run was dominated by that one long derivation.

By the end, I didn’t get an offer, but I appreciated that the process itself seemed

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