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Updated weekly · Last refresh Oct 17

Leidos Software Engineer Interview Questions

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

50questions
~9htotal time
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1
CodingStart here. 10 questions · ~111 min
Remove Duplicates From ListEasy
Practice
Recently asked

Remove repeated integers while preserving the order of each value's first occurrence.

deduplicationArraysData StructuresLeidos
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2
Execution9 questions · ~100 min
Handle Sprint PivotingMedium
Recently asked

Handle a mid-sprint priority change while protecting delivery, team focus, and stakeholder alignment.

sprintsAgileBacklog ManagementLeidos
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3
Security & Infrastructure9 questions · ~100 min
Security Clearance EligibilityEasy
Recently asked

Evaluate how to handle secret clearance eligibility as an access-control and trust-boundary requirement in a secure engineering role.

access controlidentity managementpermissionsLeidos
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4
Technical Fundamentals9 questions · ~100 min
Stack vs QueueEasy
Recently asked

Tests the difference between Stack and Queue, especially access order and common use cases.

Language FeaturesJVM InternalsData StructuresLeidos
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5
Pipelines3 questions · ~33 min
Experience With GitEasy
Recently asked

Explain how you use Git for versioning, collaboration, and release control in pipeline development.

InfrastructureToolsAutomationLeidos
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6
System Design6 questions · ~66 min
Power Triangle ExplanationMedium
Recently asked

Assesses your grasp of power systems fundamentals and ability to explain the concept clearly.

system designLeidos
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7
More topics4 questions · ~44 min
Design and Integration of REST APIsMedium
Recently asked

Assesses API design thinking and how you integrate services into a working system.

integrationmicroservicesLeidos
SQL Joins and AggregationMedium
Recently asked

Evaluates SQL proficiency with joins and aggregation to extract the right results.

aggregationsqlLeidos
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
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 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 50 questions plus 3 hands-on drills to finish this plan.