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Updated weekly · Last refresh Aug 30

Booz Allen Hamilton Data Engineer Interview Questions

The questions to prepare for a Booz Allen Hamilton Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
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1
SQL & Data ManipulationStart here. 11 questions + 2 drills · ~111 min
Top Departments by Average SalaryMedium
Practice

Use JOIN, GROUP BY, and HAVING to find the top three departments by average salary with at least five employees.

Group ByHavingAggregationsBooz Allen Hamilton
Clustered vs Non-Clustered IndexesMedium

Explain how clustered and non-clustered indexes differ in storage, lookup behavior, and query performance.

JoinsData WranglingBooz Allen Hamilton
Explaining Visualization Tool ExperienceEasy

Explain how you use SQL analysis to build dashboards, choose visuals, and communicate insights to stakeholders.

ToolsData WranglingBooz Allen Hamilton
SQL Top Spending by MonthMedium
Practice
Practice drill

Rank departments by monthly spending using aggregation, a CTE, and ROW_NUMBER().

JoinsAggregationsBooz Allen Hamilton
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
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2
Pipelines28 questions · ~231 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityBooz Allen Hamilton
Data Governance in PipelinesMedium

Describe a practical approach to data governance across shared data pipelines, including quality, ownership, lineage, and controlled data access.

InfrastructureQualityBooz Allen Hamilton
Design Cloud ETL Migration PipelineEasy

Design a cloud-native batch ETL platform on AWS or Azure for 2.5 TB/day of mixed-source data with orchestration, quality checks, and incremental loads.

InfrastructureToolsQualityBooz Allen Hamilton
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3
Coding3 questions · ~25 min
Map vs FlatMap in SparkMedium

Evaluates understanding of core Spark transformations and their impact on data shape.

Booz Allen Hamilton
Unit Tests for ETL PipelinesMedium

Tests your software engineering discipline for validating ETL logic and preventing regressions.

Data StructuresTestingQualityBooz Allen Hamilton
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4
Behavioral & Leadership8 questions · ~66 min
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The finish line: interview-readyComplete all 50 questions plus 2 hands-on drills to finish this plan.