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Updated weekly · Last refresh Aug 30

Vanguard Data Engineer Interview Questions

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

42questions
~6htotal time
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1
SQL & Data ManipulationStart here. 9 questions + 1 drill · ~88 min
Top Customers by Sales RevenueEasy
Practice

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsVanguard
Top Products and Repeat PurchasesHard
Practice

Use PostgreSQL CTEs, joins, aggregation, and window functions to rank recent products and find seven-day repeat buyers.

sql queriesAggregationsVanguard
Handling Missing and Dirty SQL DataMedium

Explain how to profile, clean, and standardize missing or dirty data before analysis.

Data WranglingCase WhenQualityVanguard
Top Clients by Volume per RegionMedium
Practice
Practice drill

Rank clients by last-quarter transaction volume per region using aggregation and window functions.

JoinsData WranglingGroup ByVanguard
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2
Pipelines22 questions · ~190 min
Cloud Platform Experience for PipelinesMedium

Describe practical experience building pipelines on AWS, including orchestration, security, and data quality.

InfrastructureETLData ModelingVanguard
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLVanguard
ETL vs ELT Trade-offsEasy

Compare ETL and ELT, and explain when ELT is the better pipeline pattern.

ETLELTData ModelingVanguard
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3
Coding3 questions · ~26 min
API to Database with PythonMedium

Tests your ability to build reliable data ingestion code using Python and persistence.

Hash TablesArraysStringsVanguard
Efficient Large Dataset ProcessingMedium

Tests performance thinking, scalability, and practical implementation details for large data.

Hash TablesArraysSortingVanguard
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4
Behavioral & Leadership8 questions · ~69 min
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The finish line: interview-readyComplete all 42 questions plus 1 hands-on drill to finish this plan.