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Updated weekly · Last refresh Sep 22

Leidos Full Stack Engineer Interview Questions

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

6questions
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1
Technical FundamentalsStart here. 4 questions · ~32 min
Docker ExperienceEasy

Assesses practical Docker experience and learning curve.

dockercontainerizationtechnical experienceLeidos
Docker in Production at LeidosMedium

Tests experience deploying Docker-based solutions in production for Leidos-scale applications.

production environmentdockertechnical experienceLeidos
Front-End Framework DifferencesMedium

Evaluates decision criteria and experience across multiple front-end frameworks in Leidos projects.

technical experienceLeidos
Managing Front-End StateMedium

Assesses approach to state management in front-end codebases in Leidos contexts.

state managementtechnical experienceLeidos
2
More topics2 questions · ~16 min
Optimizing Slow PostgreSQL Research QueriesMedium

Explain how you diagnosed and optimized a slow PostgreSQL query using execution plans, indexing, and query rewrites.

JoinsData WranglingAggregationsLeidos
Securing APIs Against Common ThreatsMedium

Tests understanding of API security practices applicable to defense/government contexts.

vulnerabilitiestechnical experienceapi securityLeidos

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
SQL for User RetentionMedium
Practice
Practice drill

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

Window FunctionsDate FunctionsCTEsGoogleLeidosCConstellation Technologies
SQL Average Transaction Per CustomerEasy
Practice
Practice drill

Task xAI's finance analytics team wants a per-customer view of transaction values. Write a PostgreSQL query that calculates the average transaction amount...

Date FunctionsGroup ByAggregationsxAIBNP ParibasLeidos
Second Highest Without AggregatesHard
Practice
Recently asked
Practice drill

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

SubqueriesRankingSelf-JoinsCredit GenieCisco Restaurant + BarDevoteam
The finish line: interview-readyComplete all 6 questions plus 3 hands-on drills to finish this plan.