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Updated weekly · Last refresh Aug 30

Garner health Data Engineer Interview Questions

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

17questions
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1
PipelinesStart here. 3 questions · ~27 min
ETL for Healthcare Claims IngestionHard

Tests end-to-end ETL design, data validation, and warehouse loading for healthcare claims at Garner health.

Data Qualitydata integrationETLGarner health
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityGarner health
End-to-End Pipeline DesignHard

Evaluates end-to-end pipeline design, data parsing, and advanced SQL implementation for healthcare data workflows.

data parsingsqlarchitectureGarner health
2
Behavioral & Leadership12 questions · ~108 min
Deadline Pressure With Incomplete DataMedium

Tests prioritization under pressure, judgment with incomplete data, and ownership in delivering a decision despite ambiguity.

time managementDealing With AmbiguityPrioritizationGarner health
Handling Architectural Disagreement Cross-FunctionallyMedium

Tests conflict resolution and influence without authority when a cross-functional stakeholder challenges an architectural decision.

Influence Without AuthorityConflict ResolutionCommunicationGarner health
Explaining Technical Issues to ExecutivesEasy

Tests communication and influence: can you translate technical complexity into business decisions, align stakeholders, and drive action?

Influence Without AuthorityStakeholder ManagementCommunicationGarner health
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3
More topics2 questions · ~18 min
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersGarner health
Optimize Complex Join QueryHard

Tests performance tuning of complex SQL on large datasets.

Window FunctionsPerformance TuningJoinsGarner health

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
7-Day Rolling Active UsersMedium
Practice
Practice drill

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsMetaSpotifyMeta IT
SQL Data Quality ChecksHard
Practice
Practice drill

Detect missing fields, duplicate transaction keys, invalid amounts, and merchant reference issues with PostgreSQL CTEs and joins.

Data Qualitynull handlingdata integritySigmoid
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
The finish line: interview-readyComplete all 17 questions plus 3 hands-on drills to finish this plan.