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Updated weekly · Last refresh Aug 30

Jane Street Business Analyst Interview Questions

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

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1
Statistics & ProbabilityStart here. 3 questions · ~25 min
Guaranteed Matching Pair in SocksEasy

Use worst-case reasoning to find the minimum number of sock draws needed to guarantee a matching pair.

combinatoricsExpected ValueConditional ProbabilityJane Street
Probability of Sum NineEasy

Compute the probability that two fair six-sided dice add up to 9 by counting favorable outcomes over total outcomes.

DistributionsExpected ValueConditional ProbabilityJane Street
Optimal Die-Roll StrategyHard

Tests quantitative reasoning, decision-making under uncertainty, and expected value calculations.

Decision MakingprobabilityExpected ValueJane Street
2
Strategy3 questions · ~25 min
Estimate Flights Over the USMedium

Estimate the number of commercial flights currently airborne over the United States using a structured market sizing approach.

EstimationassumptionsMarket SizingJane Street
Counterfeit Coin IdentificationMedium

Tests structured problem solving and efficiency under strict constraints.

Estimationdiagnostic frameworkProblem SolvingJane Street
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3
Execution4 questions · ~34 min
Latency Versus Risk ChecksHard

Tests ability to reason about performance versus controls in high-stakes trading infrastructure.

latencyTrade-offsJane Street
Mitigating Conflicting Trade ExecutionsHard

Tests risk mitigation thinking, incident response, and balancing safety with continuity of trading operations.

Rollback PlanComplianceRisk AssessmentJane Street
Handling Settlement Failure SpikesHard

Tests operational triage, prioritization logic, and ability to design resilient workflows for market operations.

Risk AssessmentPrioritizationJane Street
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4
Behavioral & Leadership7 questions · ~59 min
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The finish line: interview-readyComplete all 17 questions to finish this plan.