Description Systems Integration & Test EngineerUK NASR PDT Evolution ProgramLeidos is seeking a Systems Integration & Test Engineer to be based out of Gaithersburg, MD. This position will support the United Kingdom National Airspace System Replacement Product Delivery Team - UK NASR PDT. This effort delivers enhanced capabilities to replace and modernize the current operational system supporting UK air traffic services.You will join a dynamic engineering team responsible for building and sustaining real-time, high-availability, safety-critical systems that directly support national airspace operations.This is a U.S.-based position that offers a balanced hybrid schedule between 2-3 days in the office per week.What You’ll DoDesign, develop, and execute comprehensive integration and test plans, procedures, and cases to verify system functionality, performance, and requirements complianceLead and coordinate formal test events including:Factory Acceptance Testing (FAT)Functional TestingSystem & Integration TestingUser Acceptance Testing (UAT)Ensure traceability between requirements, verification activities, and test artifactsDevelop and maintain automated test scripts using tools such as HP ALM, Selenium, or equivalent platformsTrack and report test execution status, producing detailed reports and artifact packages for internal stakeholders and government customersManage defects, change requests, and action items through resolutionFacilitate test readiness reviews, peer reviews, and customer-facing test planning sessionsCollaborate with software engineers, system engineers, and program leadership to ensure testability of requirements and alignment with project schedulesSupport development and maintenance of systems engineering documentation including:Requirements Verification Matrices (RVM)Interface documentationArchitectural artifactsMentor junior engineers and promote best practices in integration and verificationRequired QualificationsBachelor’s degree in a related technical discipline with 8+ years of professional experience,OR Master’s degree with 6+ years of professional experienceAbility to obtain and maintain a Public Trust clearanceExperience leading integration and test activities for complex software systemsExperience working within a defined Integration & Test development lifecycleStrong hands-on integration experience with large, distributed, or real-time systemsExperience working in UNIX and/or Linux environmentsDemonstrated ability to lead cross-functional teams and coordinate formal test eventsStrong communication skills to interface effectively with internal teams and external government stakeholdersUS citizenship requiredDesired QualificationsAdvanced integration experience in one or more of the following areas:New system functionality integrationRegression testingProblem determination and root cause analysisData reduction and analysisPR verification and change validationExperience supporting formal government acceptance testingFamiliarity with systems engineering practices including:Requirements engineeringRequirements baseline control and managementOperational and decision analysisSystem definition and architecture developmentAir Traffic domain knowledge or experience supporting air traffic programsExperience operating in fast-paced, high-accountability environments requiring independent executionWhy LeidosYou will play a critical role in validating and integrating software that supports national airspace operations. This position requires precision, discipline, and leadership — ensuring complex systems perform reliably in operational environments where safety and performance are paramount.If you are motivated by solving complex integration challenges and leading formal verification efforts in regulated, mission-critical systems, we encourage you to apply.If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.Original Posting:February 19, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.Pay Range:Pay Range $107,900.00 - $195,050.00The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.About LeidosLeidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit and BenefitsPay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at Your DataBeware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at .If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.Commitment to Non-DiscriminationAll qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.