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Updated weekly · Last refresh Oct 17

WEX Data Engineer Interview Questions

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

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1
PipelinesStart here. 13 questions · ~104 min
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
Pipeline Alerting and Monitoring DesignMedium

Set up pipeline monitoring and alerting that catches critical failures quickly while limiting noisy alerts.

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
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
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityWEX
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2
Behavioral & Leadership13 questions · ~104 min
Managing Expectations on a Weak ModelMedium

Tests stakeholder management when financial analysis creates friction, especially around communicating bad news, influencing decisions, and preserving trust.

Stakeholder Managementexpectation managementFinancial ModelingWEX
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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
Optimize a Slow SQL QueryHard
Practice
Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingAmeripriseEEltro Cyberchrome PrivateEnergyHub
Explain SQL JoinsEasy
Practice
Recently asked
Practice drill

Use a PostgreSQL join to include departments without employees and count matching employees.

data relationshipsJoinsjoin typesWEX
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
The finish line: interview-readyComplete all 27 questions plus 3 hands-on drills to finish this plan.