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Updated weekly · Last refresh Oct 18

Eliassen Group Data Engineer Interview Questions

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

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1
PipelinesStart here. 6 questions · ~48 min
Testing and CI for PipelinesEasy

Explain how you apply automated testing and CI practices to data pipelines and pipeline releases.

InfrastructureToolsQualityEliassen Group
Cloud Pipeline Data SecurityMedium

Key security considerations for a cloud data pipeline, from ingestion through storage, orchestration, and monitoring.

InfrastructureGovernanceETLEliassen Group
AWS High Availability ArchitectureHard

Tests your expertise in designing resilient AWS architectures that maintain availability during failures.

high availabilityarchitectureawsEliassen Group
Migrating Legacy ETL to CloudMedium

Tests your approach to modernization, risk management, and delivery of reliable data transformations.

ETLlegacy systemsEliassen Group
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2
Behavioral & Leadership4 questions · ~32 min
Mentoring an Engineer Through StandardsEasy

Tests mentorship and leadership through technical best practices, including influence, communication, and ownership of team quality.

best practicesMentorshipLeadershipEliassen Group
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3
More topics3 questions · ~24 min
Handling Architectural Stakeholder ConflictMedium

Tests conflict resolution and influence when a stakeholder challenges an architectural decision with meaningful business or technical stakes.

Conflict ResolutionStakeholder ManagementCommunicationEliassen Group
Cost vs Query PerformanceMedium

Tests your decision-making around data modeling trade-offs to meet performance and cost goals for clients.

Data ModelingEliassen Group
Modeling Oracle vs NoSQLMedium

Tests your ability to model data appropriately across relational and NoSQL systems for analytics and client outcomes.

nosqlData ModelingEliassen Group

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Optimizing Slow SQL QueriesMedium
Practice
Practice drill

Optimize a customer order aggregation query while preserving date, status, join, and spending filters.

Window Functionsdatabase optimizationJoinsLam ResearchPublicis SapientAtlanticus Services
SQL Window Functions for Rolling MetricsHard
Practice
Practice drill

Calculate each user's 7-day activity average and rank users within their cohort using PostgreSQL window functions.

Window FunctionsDate FunctionsData ManipulationTredenceEchostarEliassen Group
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
The finish line: interview-readyComplete all 13 questions plus 3 hands-on drills to finish this plan.