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Northrop Grumman Data Engineer Interview Questions

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

40questions
~5htotal time
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1
PipelinesStart here. 20 questions · ~160 min
Data Governance in PipelinesMedium

Describe a practical approach to data governance across shared data pipelines, including quality, ownership, lineage, and controlled data access.

InfrastructureQualityNorthrop Grumman
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityNorthrop Grumman
ETL vs ELT Trade-offsEasy

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

ETLELTData ModelingNorthrop Grumman
Data Quality and Schema EvolutionMedium

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

schema evolutionData ModelingQualityNorthrop Grumman
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2
SQL & Data Manipulation5 questions + 3 drills · ~70 min
SQL and NoSQL OptimizationMedium

Evaluates your ability to optimize queries, schemas, and storage for complex workloads.

database optimizationnosqlsqlNorthrop Grumman
Key Pillars of Data GovernanceMedium

Evaluates your grasp of governance components such as ownership, standards, and controls.

data managementNorthrop Grumman
Compliance With Security ProtocolsMedium

Tests your ability to operationalize security requirements across the data lifecycle.

data managementsecurity complianceNorthrop Grumman
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
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
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
Behavioral & Leadership15 questions · ~120 min
Troubleshooting a High-Stakes Data IssueMedium

Tests ownership in diagnosing a data issue, communicating clearly under pressure, and driving a durable fix with measurable impact.

CommunicationOwnershipDealing With AmbiguityNorthrop Grumman
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The finish line: interview-readyComplete all 40 questions plus 3 hands-on drills to finish this plan.