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Updated weekly · Last refresh Oct 17

Leidos Data Engineer Interview Questions

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

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1
Behavioral & LeadershipStart here. 8 questions · ~64 min
Prioritizing Conflicting High-Stakes WorkEasy
Recently asked

Tests prioritization under pressure, stakeholder management, and ownership when multiple urgent requests compete for limited time.

Stakeholder ManagementOwnershipDealing With AmbiguityLeidos
Internship ExpectationsEasy
Recently asked

Assesses your expectations, learning goals, and how you plan to contribute during an internship.

Leidos
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2
More topics6 questions · ~48 min
SQL vs NoSQL for Banking DataEasy
Recently asked

Explain how relational SQL databases differ from NoSQL systems in schema, consistency, and scaling for banking workloads.

performancedatabasesData ModelingLeidos
ETL and Data Warehouse OperationsMedium
Recently asked

Assesses practical ETL and data warehouse knowledge, including handling text-based transformations.

ETLLeidos
ETL Data Validation and Error HandlingMedium
Recently asked

Tests reliability practices for data quality, failure modes, and recovery in ETL.

error handlingETLdata validationLeidos
Handling Data Security in High-Availability DatabasesMedium
Recently asked

Assesses knowledge of data security, integrity, and reliability in production-grade databases.

data securityhigh availabilityLeidos
Building a Data Pipeline ArchitectureMedium
Recently asked

Tests end-to-end pipeline design, data modeling choices, and operational considerations.

data pipelinearchitectureLeidos
Choosing Relational vs NoSQLMedium
Recently asked

Tests data modeling tradeoffs, workload fit, and sound engineering judgment.

Decision MakingrequirementsLeidos

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Second Highest Without AggregatesHard
Practice
Recently asked
Practice drill

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCredit GenieDevoteamCisco Restaurant + Bar
SQL Window Functions Moving AverageMedium
Practice
Recently asked
Practice drill

Calculate a three-day moving average of active-client revenue using aggregation and SQL window functions.

Window FunctionsData AnalysissqlEEvalueserveSShyena Tech YarnsAATB Financial
SQL for User RetentionMedium
Practice
Recently asked
Practice drill

Measure monthly user retention by signup cohort using date calculations and aggregated activity.

Window FunctionsDate FunctionsCTEsGoogleLeidosCConstellation Technologies
The finish line: interview-readyComplete all 14 questions plus 3 hands-on drills to finish this plan.