Jane Street·Quantitative Trader

Jane Street Quantitative Trader interview experience

No offer

Hard

Positive

London, EnglandPosted Oct 2025 · Candidate report, summarized by Dataford

My interview journey ramped up in difficulty in a very clear sequence.

I started with a first round that was mostly “games in probability” at a baseline level, including classic probability brainteaser-style questions. Then the next round got noticeably harder, with game questions that pushed expected value and strategy farther than I expected.

In the toughest part, the problem involved two-player decision-making around dice and coins. The setup forced me to think like a strategist: after rolling, the player had to choose whether to act for their own outcome, defer for a later round, or act for the other option. What they really cared about was the optimal

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