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Leidos Software Engineer Interview Questions

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

50questions
~8htotal time
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1
CodingStart here. 14 questions · ~137 min
Palindrome and String ReversalEasy
Practice

Determine whether a string is a palindrome and return its reversed form using two-pointer string processing.

string manipulationLeidos
Reverse Words in a StringEasy
Practice

Reverse the order of words in a report string while preserving each word and normalizing whitespace.

string manipulationAlgorithmsLeidos
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2
Execution12 questions · ~117 min
Your Strengths and WeaknessesEasy

Tests self-awareness and how you position yourself for success in an Account Executive role at Aqr.

Trade-offsSuccess CriteriaRisk AssessmentLeidos
Handle Sprint PivotingMedium

Assesses planning, prioritization, and communication when sprint goals change.

sprintsAgileLeidos
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3
Security & Infrastructure10 questions · ~98 min
Security Clearance EligibilityMedium

Assesses readiness to meet security requirements for defense-related work.

Leidos
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4
Pipelines3 questions · ~29 min
Experience With GitEasy

Tests your familiarity with Git workflows that support QA collaboration and traceability.

ToolsDependenciesQualityLeidos
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5
System Design6 questions · ~59 min
Power Triangle ExplanationMedium

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

system designLeidos
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6
Behavioral & Leadership4 questions · ~39 min
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7
More topics1 question · ~10 min
SQL Joins and AggregationMedium

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

aggregationsqlLeidos
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
Basic SQL and String ReverseEasy
Practice
Practice drill

Reverse Costar property search strings with PostgreSQL and flag rows whose stored expected value does not match.

sql queriesstring manipulationCostar
SQL: Character CountEasy
Practice
Practice drill

Count a target character case-insensitively in a Discord message using PostgreSQL string functions.

Data Analysissql queriesstring manipulationDiscord
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.