Jane Street's quant and trading interviews are probability-and-games heavy, prizing clean reasoning you can narrate out loud over memorised formulas.
In 2026 expect combinatorial brain teasers (the classic handshake puzzle), expected-value and optimal-stopping games (stop a die roll and take its value), market-making and betting exercises, and mental-math under mild time pressure. Interviewers care how you think: they will push on your assumptions, ask you to price a bet, and watch whether you update correctly when given new information. No finance background is required; Jane Street screens for probabilistic intuition, comfort with expected value and variance, and the composure to reason aloud while being questioned. Practise thinking in bets and stating your logic clearly.
About Jane Street
Quantitative trading firm; market-maker across global equities, ETFs, options, crypto, and bonds.
Apply or get sourced; online assessment or recruiter screen
Probability and mental-math phone or virtual round
Interviews on expected value, games, and market-making
Final rounds with traders or researchers, then offer
Round 1 (30-45 min)
probability and mental-math screen with brain teasers.
Round 2 (45-60 min)
expected-value and market-making games with the interviewer probing your reasoning.
Round 3 (45-60 min)
deeper trading games and behavioural fit with traders or researchers.
Sourced from 2+ candidate post-mortems. Hit Practice to answer any one with AI voice feedback.
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Sign up free: unlock all questionsThe typical Jane Street recruitment process has 4 stages: Apply or get sourced; online assessment or recruiter screen → Probability and mental-math phone or virtual round → Interviews on expected value, games, and market-making → Final rounds with traders or researchers, then offer.
Jane Street typically conducts 3 interview rounds: Round 1 (30-45 min): probability and mental-math screen with brain teasers.; Round 2 (45-60 min): expected-value and market-making games with the interviewer probing your reasoning.; Round 3 (45-60 min): deeper trading games and behavioural fit with traders or researchers..
HireStepX recommends the Think-in-Bets framework for this type of interview: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information
To answer this question well, HireStepX recommends the Think-in-Bets approach: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information Ground your answer in a specific real example from your own experience.
To answer this question well, HireStepX recommends the Think-in-Bets approach: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information Ground your answer in a specific real example from your own experience.
To answer this question well, HireStepX recommends the Think-in-Bets approach: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information Ground your answer in a specific real example from your own experience.
To answer this question well, HireStepX recommends the Think-in-Bets approach: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information Ground your answer in a specific real example from your own experience.
To answer this question well, HireStepX recommends the Think-in-Bets approach: Reason aloud through probability and expected-value games, price bets from first principles, and update cleanly when the interviewer adds information Ground your answer in a specific real example from your own experience.