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Updated weekly · Last refresh Aug 30

Bain & Data Engineer Interview Questions

The questions to prepare for a Bain & Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

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1
SQL & Data ManipulationStart here. 16 questions + 1 drill · ~149 min
Second Highest Trader SalaryEasy
Practice

Find the second highest distinct salary from a single table using basic PostgreSQL ordering and limiting.

SubqueriesRankingSortingBain &
Identify Duplicate Records in SQLEasy
Practice

Find repeated Bain contact emails using GROUP BY and HAVING while excluding NULL identifiers.

RankingData WranglingBain &
Understanding Common Table Expressions (CTEs)Medium

Explain what CTEs are and their advantages in SQL queries.

CTEsBain &
Top Products Rolling Window SQLMedium
Practice
Practice drill

Use aggregation and ROW_NUMBER to find the top three Bain products by revenue in each category over the latest 30 days.

Window FunctionsDate FunctionsRankingBain &
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2
Pipelines17 questions · ~148 min
Fault Tolerance in Data PipelinesHard

Approach for building fault tolerance into a distributed data pipeline, including retries, idempotency, and recovery controls.

InfrastructureIdempotencyQualityBain &
Design an End-to-End Data PipelineMedium

Approach for designing an end-to-end data pipeline from ingestion through transformation, storage, and downstream consumption.

data pipelinedesigningestionBain &
Data Quality in ETL PipelinesEasy
Recently asked

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityBain &
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3
Coding16 questions · ~139 min
Recursion in Algorithm SolvingMedium

Evaluates ability to apply recursive patterns to algorithmic problems.

RecursionTreesGraphsBain &
Two Pointers for Ordered DataEasy

Evaluates algorithmic thinking for efficient processing of ordered data.

ArraysSortingTwo PointersBain &
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4
More topics1 question · ~9 min
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The finish line: interview-readyComplete all 50 questions plus 1 hands-on drill to finish this plan.