Senior Systems Integration and Test Engineer Leidos 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. What You'll Do

• Design, develop, and comprehensive integration and test plans, procedures, and cases to verify system functionality, performance, and requirements compliance
• Lead and coordinate formal test events including:
• Factory Acceptance Testing (FAT)
• Functional Testing
• System & Integration Testing
• User Acceptance Testing (UAT)
• Ensure traceability between requirements, verification activities, and test artifacts
• Develop and maintain automated test scripts using tools such as HP ALM, Selenium, or equivalent platforms
• Track and report test execution status, producing detailed reports and artifact packages for internal stakeholders and government customers
• Manage defects, change requests, and action items through resolution
• Facilitate test readiness reviews, peer reviews, and customer-facing test planning sessions
• Collaborate with software engineers, system engineers, and program leadership to ensure testability of requirements and alignment with project schedules
• Support development and maintenance of systems engineering documentation including:
• Requirements Verification Matrices (RVM)
• Interface documentation
• Architectural artifacts
• Mentor junior engineers and promote best practices in integration and verification Required Qualifications
• Bachelor's degree in a related technical discipline with 8+ years of professional experience,
• OR Master's degree with 6+ years of professional experience
• Ability to obtain an SF-85P Public Trust clearance from the FAA customer.
• Experience leading integration and test activities for complex software systems
• Experience working within a defined Integration & Test development lifecycle
• Strong hands-on integration experience with large, distributed, or real-time systems
• Experience working in UNIX and/or Linux environments
• Demonstrated ability to lead cross-functional teams and coordinate formal test events
• Strong communication skills to interface effectively with internal teams and external government stakeholders Desired Qualifications
• Advanced integration experience in one or more of the following areas:
• New system functionality integration
• Regression testing
• Problem determination and root cause analysis
• Data reduction and analysis
• PR verification and change validation
• Experience supporting formal government acceptance testing
• Familiarity with systems engineering practices including:
• Requirements engineering
• Requirements baseline control and management
• Operational and decision analysis
• System definition and architecture development
• Air Traffic domain knowledge or experience supporting air traffic programs
• Experience operating in fast-paced, high-accountability environments requiring independent execution Why Leidos You 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 w 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:

August 31, 2026 For 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 - $195,050.00 The 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....Visit the Employer site for more details