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Beghou Data Engineer Interview Questions

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

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1
PipelinesStart here. 5 questions · ~40 min
Handle PySpark Data SkewMedium

Approach for detecting and mitigating skew in PySpark pipelines using partitioning, join strategies, and runtime monitoring.

Data Qualitypysparkdata skewnessBBeghou
Describe a Complex Transformation PipelineMedium

Explain a complex ETL transformation you built, including the main challenges and how you handled them.

ETLData ModelingQualityBBeghou
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityBBeghou
Choosing Storage for ClientsMedium

Assesses ability to select storage options based on client constraints and data needs.

Decision MakingBBeghou
Fixing Spark Memory OverflowsHard

Evaluates troubleshooting and optimization techniques for Spark memory issues.

pysparkoptimizationBBeghou
2
More topics3 questions · ~24 min
Optimizing Slow Sales QueriesEasy

Explain how to diagnose and optimize a slow SQL query using execution plans, indexing, and simpler query patterns.

JoinsData WranglingAggregationsBBeghou
Star vs Snowflake for Sales AnalyticsMedium

Compare star and snowflake schemas for warehouse design, including trade-offs in normalization, query simplicity, and analytics performance.

JoinsData WranglingGroup ByBBeghou
Troubleshooting a High-Stakes Data IssueMedium

Tests ownership in diagnosing a data issue, communicating clearly under pressure, and driving a durable fix with measurable impact.

CommunicationOwnershipDealing With AmbiguityBBeghou

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
SQL Self Joins and ExplodeMedium
Practice
Practice drill

Transform comma-separated employee tags, join employees to managers, and aggregate active direct reports by manager and tag.

pysparkaggregationJoinsTredence
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
The finish line: interview-readyComplete all 8 questions plus 3 hands-on drills to finish this plan.