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Updated weekly · Last refresh Aug 30

Dexcom Data Engineer Interview Questions

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

23questions
~3htotal time
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1
PipelinesStart here. 7 questions · ~57 min
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityDexcom
Design Scalable Pipeline InfrastructureHard

Design the core pipeline infrastructure for a new project, with attention to orchestration, data quality, idempotency, and future scale.

InfrastructureToolsQualityDexcom
ETL Process ExperienceEasy

Tests your ability to build reliable data pipelines for transforming and loading data.

ETLBatch ProcessingOrchestrationDexcom
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2
SQL & Data Manipulation4 questions + 3 drills · ~62 min
Structured vs Unstructured Data BasicsEasy

Explain how structured and unstructured data differ in format, storage, and how easily they can be queried with SQL.

Data WranglingETLDexcom
Tuning a Slow QueryHard

Tests your ability to diagnose query bottlenecks and improve runtime and resource usage.

Window FunctionsJoinsAggregationsDexcom
SQL Performance OptimizationMedium

Tests practical SQL and database performance tuning experience across real systems.

Window FunctionsData WranglingAggregationsDexcom
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
Handle Missing Financial Input ValuesMedium
Practice
Practice drill

Use joins, CTEs, and CASE logic to flag and fill missing financial fields for Qlik planning records.

Data WranglingETLQualityQlik
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3
Coding5 questions · ~40 min
Analyze Time and Space ComplexityMedium

Tests your ability to reason about algorithm efficiency and resource usage.

space complexitytime complexityDexcom
Data Transformation FunctionEasy

Tests your coding ability to implement reliable data transformations with correct handling of inputs.

Hash TablesArraysStringsDexcom
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4
Behavioral & Leadership7 questions · ~57 min
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The finish line: interview-readyComplete all 23 questions plus 3 hands-on drills to finish this plan.