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Updated weekly · Last refresh Oct 17

Brex Data Engineer Interview Questions

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

24questions
~4htotal time
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1
PipelinesStart here. 14 questions · ~139 min
Visualization Tools for Analytics PipelinesEasy

Discuss which visualization tools fit different analytics pipeline needs, and why warehouse integration and monitoring matter.

ToolsData ModelingQualityBrex
Data Modeling Tools and ArchitectureEasy

Preferred tools and patterns for data modeling and pipeline architecture in a modern data platform.

InfrastructureToolsData ModelingBrex
Describe a Complex Transformation PipelineMedium

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

ETLData ModelingQualityBrex
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2
SQL & Data Manipulation3 questions + 2 drills · ~50 min
Advanced SQL for TransformationsHard
Practice

Stage settled Brex card transactions, aggregate monthly volumes, and rank merchants by transaction volume.

Window Functionsfinancial dataCTEsBrex
Optimize Queries and Reduce CostsMedium

Assesses performance tuning and cost optimization techniques in modern cloud warehouses.

Performance Tuningquery optimizationBrex
Optimizing Slow SQL QueriesMedium

Tests your ability to diagnose and improve SQL performance using execution plans and indexing strategies.

JoinsCTEsAggregationsBrex
Calculate 30-Day User RetentionHard
Practice
Practice drill

Use CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.

Window FunctionsDate FunctionsAggregationsCurefitIndeedTikTok
Weekly Signup Cohort RetentionHard
Practice
Practice drill

Calculate weekly retention by signup cohort using CTEs, joins, date truncation, and distinct user counts.

Window FunctionsDate FunctionsAggregationsBrexPostmaneToro
3
Behavioral & Leadership5 questions · ~50 min
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4
More topics2 questions · ~20 min
Efficient Dataset MergeMedium
Practice

Merge two sorted datasets in linear time while resolving duplicate keys in favor of the second dataset.

Hash Tablesdata synchronizationArraysBrex
Ingesting Unstructured API PayloadsHard
Practice

Normalize inconsistent financial API records, skip malformed entries, and deduplicate transactions efficiently.

deduplicationapi integrationapiBrex

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