Jane Street Interview Questions

The questions to prepare for Jane Street interviews, across all roles. Questions from real interview reports rank first. Updated daily.

50questions

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CodingStart here. 5 questions · ~57 min

Determine whether an integer reads identically forward and backward using arithmetic reversal.

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SQL & Data Manipulation5 questions · ~57 min

Identify inconsistent transaction records using null checks, reference validation, duplicate detection, and status validation.

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Statistics & Probability5 questions · ~57 min

Expected Flips for Two HeadsMedium

Compute the expected waiting time to see two consecutive heads when flipping a fair coin.

DistributionsExpected ValueConditional Probability

Jane Street

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Pipelines3 questions · ~34 min

Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQuality

Jane Street

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Metrics5 questions · ~57 min

Diagnose a Metric Drop After LaunchMedium

Investigate why a key KPI moved the wrong way after a product change and separate signal from noise.

Lagging IndicatorsLeading IndicatorsDiagnosis

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Execution5 questions · ~57 min

Balancing Delivery and Technical DebtHard

Explain how to deliver valuable features quickly while systematically reducing technical debt and protecting long-term engineering velocity.

Backlog Managementcode maintainabilitytechnical debt

Jane Street

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