Jane Street·Quantitative Trader

Jane Street Quantitative Trader interview experience

No offer

Hard

Positive

United KingdomPosted Sep 2025 · Candidate report, summarized by Dataford

My first stage was centered on probability games and it quickly became clear that they were testing expected value and game strategy.

I sat in a phone interview format where the questions were math-heavy, and the theme was working out expected value while reasoning through optimization—basically, figuring out what strategy made sense given the probabilities.

In another part of the process, the interview rounds stayed in the same universe but went deeper. I ended up with multiple probability-game questions across rounds, including expected value and conditional probability. I also saw references to Markov chains as part of the probability modeling, which made the problem-solving feel more advanced than simple brainteaser

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