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Jane Street Data Analyst Interview Questions

The questions to prepare for a Jane Street Data Analyst interview. Questions from real interview reports rank first. Updated weekly.

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1
Statistics & ProbabilityStart here. 7 questions · ~56 min
Bayes Rule for Disease TestingMedium

Tests Bayesian inference and handling base rates in probabilistic reasoning.

Bayesian ReasoningBiasConditional ProbabilityJane Street
Expected Draws to Get All RedMedium

Tests expectation calculations for sampling without replacement and negative dependence.

SamplingExpected ValueConditional ProbabilityJane Street
Winning Probability in Die RaceEasy

Tests Markov-style reasoning and turn-based probability computation.

probabilityExpected ValueConditional ProbabilityJane Street
Circular Placement Winning StrategyMedium

Tests game theory reasoning and existence of winning strategies in impartial combinatorial games.

Decision MakingJane Street
Optimal Strategy With Limited RollsHard

Tests optimal stopping reasoning and expected value calculation under constrained decisions.

Decision MakingExpected ValueConditional ProbabilityJane Street
Bankruptcy-Constrained Gambler RiskHard

Tests absorbing Markov chain or martingale-style reasoning for hitting probabilities.

Bayesian ReasoningExpected ValueConditional ProbabilityJane Street
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2
Behavioral & Leadership4 questions · ~32 min
Minimum Weighings for Counterfeit BagMedium

Tests information-theoretic thinking and optimal decision strategy under measurement constraints.

Decision MakingProblem SolvingJane Street
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3
More topics1 question · ~8 min
Jane Street Trading Data PipelineHard

Tests end-to-end data pipeline design, data quality checks, and validation for market data.

Data QualitytransformationsvalidationJane Street

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