Groupon Data Engineer Interview Questions

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

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ETL vs ELT Trade-offs

Easy

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

ETLELTData Modeling

Groupon

Diagnose an Integration Pipeline Issue

Medium

Structured approach to diagnose failures in an ETL integration, from source extraction through orchestration, data quality, and idempotent recovery.

ToolsDependenciesQuality

Groupon

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Optimizing a Hive Query

Medium

Tests Hive performance tuning knowledge and understanding of execution bottlenecks.

JoinsCTEsAggregations

Groupon

Weekly Averages by User or Product

Medium

Tests SQL aggregation skills and ability to structure queries for analytics use cases.

Date FunctionsGroup ByAggregations

Groupon

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Median of Streams

Hard

Tests advanced algorithmic thinking for online statistics and efficient incremental updates.

ArraysSortingHeap

Groupon

Median Function Implementation

Medium

Tests basic algorithmic thinking and correct handling of edge cases in code.

MathArraysSorting

Groupon

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