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Updated weekly · Last refresh Aug 30

WEX Data Engineer Interview Questions

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

28questions
~4htotal time
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1
PipelinesStart here. 14 questions · ~112 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityWEX
Complex ETL Pipeline ArchitectureHard

Explain the architecture of a complex ETL pipeline built from scratch, including orchestration, data quality, idempotency, and backfill strategy.

InfrastructureETLData ModelingWEX
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityWEX
Cloud Storage in Data PipelinesEasy

Discuss how cloud storage fits into ETL pipelines, including staging, data quality, and operational monitoring.

InfrastructureETLWEX
Monitoring Tools for Data PipelinesEasy

Preferred tools and approach for monitoring and managing data pipelines in production.

InfrastructureToolsQualityWEX
Design an ETL Pipeline for Large DatasetsMedium

Design an ETL pipeline to process 10TB of data daily from multiple sources into a data warehouse with strict data quality checks.

InfrastructureETLData ModelingWEX
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2
Behavioral & Leadership13 questions · ~104 min
Explaining Technical Issues ClearlyMedium

Tests whether you can translate technical complexity into business-relevant language for non-technical stakeholders and drive action.

Stakeholder ManagementCommunicationtechnical explanationWEX
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3
More topics1 question · ~8 min
Optimize Query PerformanceHard

Evaluates your techniques for improving performance and efficiency in distributed query execution.

performancedistributed systemsquery optimizationWEX

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL Rolling Transaction AverageMedium
Practice
Practice drill

Calculate 30-day rolling average transaction volume for WEX Fleet One accounts using aggregation and window functions.

Data ManipulationWEX
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
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
The finish line: interview-readyComplete all 28 questions plus 3 hands-on drills to finish this plan.