Jane Street Data Engineer Interview Questions

Implement a set-like structure using an array and hash map to support insert, delete, and random access in average O(1) time.

Hash TablesArraysData StructuresJane Street

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

Data StructuresJane Street

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

schema evolutionData ModelingQualityJane Street

Tests streaming architecture choices for burst tolerance and reliable ingestion.

InfrastructureStream ProcessingQualityJane Street

Tests ability to design scalable replay systems for long-horizon tick data validation.

Batch ProcessingOrchestrationBackfillingJane Street

Tests adaptability under changing requirements, including reprioritization, ownership, and execution in ambiguity.

OwnershipDealing With AmbiguityPrioritizationJane Street