UnitedHealth Group Data Engineer Interview Questions

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

Compare star and snowflake schemas in a warehouse pipeline, including structure and transformation trade-offs.

Design SCD Type 1 and 2

Medium

Design and implement SCD Type 1 and Type 2 dimensions with history tracking, idempotent loads, and data quality controls.

slowly changing dimensionsData ModelingBackfilling

UnitedHealth Group

Patient Data Quality and Privacy

Medium

Approach for protecting sensitive patient data while maintaining high data quality across an analytics pipeline.

ETLData ModelingQuality

UnitedHealth Group

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Optimizing Skewed Join Queries

Hard

Tests query optimization strategies for skewed joins at scale in a healthcare data environment.

Performance TuningJoins

UnitedHealth Group

Snowflake Clustering Keys

Medium

Tests understanding of clustering, pruning, and cost-performance tradeoffs in Snowflake.

Performance Tuningsnowflake schemaperformance

UnitedHealth Group

Normalization and Denormalization

Medium

Tests relational modeling fundamentals and tradeoffs between normalization and analytics performance.

performancenormalizationData Modeling

UnitedHealth Group

Compare generator expressions and list comprehensions by memory usage, execution model, and when each is preferable.

Parsing Clinical JSON to CSV

Medium

Tests Python data parsing skills and ability to transform nested healthcare-like JSON into tabular data.

json parsingData Wranglingpython

UnitedHealth Group

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