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Updated weekly · Last refresh Oct 17

Jane Street Data Engineer Interview Questions

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

21questions
~6htotal time
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1
CodingStart here. 10 questions · ~178 min
Consecutive Login FailuresMedium
Practice

Scan chronological login events and flag users with a failure run of exactly k events, excluding longer consecutive runs.

Data StructuresJane Street
Distributed Rate Limiter DesignHard
Practice

Simulate a sharded distributed token bucket that enforces per-exchange API limits with deterministic request routing.

Hash TablesapiperformanceJane Street
Graph Traversal for LineageMedium
Practice

Use multi-source BFS to find the shortest dependency chain from data sources to a downstream asset.

dfsbfscycle detectionJane Street
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2
SQL & Data Manipulation3 questions · ~53 min
Millisecond-Accurate Trade JoinHard
Practice

Align every trade with the latest market state at or before its timestamp using a millisecond-level as-of join.

large datasetsJoinsfinancial dataJane Street
Rolling 5-Minute Price AverageMedium
Practice

Calculate five-minute rolling price averages while preserving timestamps with no trades.

Window Functionsmissing valuesDate FunctionsJane Street
Clean and Transform Unstructured DatasetsMedium
Practice

Clean inconsistent trade-report fields, validate records, and join normalized trades to instrument reference data.

pandasdata cleaningData WranglingJane Street

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3
Pipelines4 questions · ~71 min
Historical Tick Data ReplayHard

Design a reproducible, high-throughput replay pipeline for testing quantitative models against years of historical tick data.

Data QualityBatch ProcessingOrchestrationJane Street
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityJane Street
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4
Behavioral & Leadership4 questions · ~71 min
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