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 DoDesign, develop, and execute 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 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…