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Updated weekly · Last refresh Oct 17

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 daily.

17questions
~2htotal time
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1
StrategyStart here. 3 questions · ~26 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

Use one digital-scale measurement to determine which of 10 coin bags contains counterfeit coins.

Estimationanalytical thinkingdata-drivenJane Street
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2
Statistics & Probability3 questions · ~26 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

Use backward induction to find the optimal stopping thresholds and expected payout when rolling a die up to three times.

Decision Makingprobabilitymathematical reasoningJane Street

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3
Execution4 questions · ~35 min
Latency Versus Risk ChecksHard

Plan how to balance trading gateway latency with risk-check coverage, reliability, and controlled delivery.

latencyTrade-offsdesign trade-offsJane Street
Handling Settlement Failure SpikesHard

Design a Jane Street workflow for a 500% settlement-failure spike and prioritize remediation by risk, exposure, and urgency.

alertingcontingency planningRisk AssessmentJane Street
Detecting Delayed Exchange DataHard

Assess the trading impact of a 50ms exchange feed delay and design detection, alerting, and response mechanisms.

latencymonitoringalertingJane Street
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4
Behavioral & Leadership7 questions · ~61 min
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The finish line: interview-readyComplete all 17 questions to finish this plan.