Systems Integration and Test Engineer

Leidos is seeking a Senior Systems Integration & Test Engineer who will be a member of a dynamic team who will be working on the United Kingdom’s National Air Traffic Services (NATS) Flight Data Processing Replacement (FDP-R) program. FDP-R is a system that will modernize and enhance the Flight Data Processing system to increase efficiency and performance of the UK National Airspace System (NAS). This system will seamlessly integrate into the NATS ecosystem, serving as a robust and reliable replacement for the current operational NAS.

Location: Gaithersburg, MD

Responsibilities:

• Design, develop, and execute test plans, test cases, and test procedures to verify software functionality, performance, and compliance with requirements.
• Lead and coordinate testing phases, including Factory Acceptance Testing (FAT), Functional Testing, Integration Testing, and User Acceptance Testing (UAT).
• Track and report test execution status, generating detailed test reports and artifact packages for stakeholders and clients.
• Manage and track defects, change requests, and action items.
• Facilitate test planning meetings, peer reviews, and customer-facing sessions to align on test objectives and schedules.
• Collaborate with developers, system engineers, and schedulers to ensure testability of requirements and alignment with project timelines.
• Support the development and updating of systems engineering documentation, such as requirements verification matrices and architectural design documents.

Required Qualifications:

• Bachelor’s degree from an accredited college in a related discipline with 4-8 years of relevant professional experience; or a master’s degree from an accredited college in a related discipline with 2-6 years of relevant professional experience.
• Ability to obtain an SF-85P Public Trust clearance from the FAA customer.
• Experience conducting technical reviews with a government agency / customer
• Experience in following a documented Integration and Test Development Process
• Experience in the use of UNIX and Linux operating systems
• Strong integration skills with hands-on experience integrating large software complex systems
• Strong communication skills to interface with internal and external customers

Desired Skills:

• The successful candidate will possess advanced integration skills and the ability to work independently in the following categories of integration:
  • New system functionality integration
  • PR verification
  • Regression testing
  • Data Reduction & Analysis
  • Analyzing identified issues and helping to determine a solution with System Engineering and Software Engineering
  • Problem Determination
• A good academic understanding and/or exposure to system engineering practices to contribute to and/or assist with system integration, requirements engineering, operational and decision analysis, systems definition, requirements baseline control and management.
• Highly organized, demonstrating the ability to work independently at times due to fast-paced and highly productive work environment
• Air Traffic Knowledge and experience working on Air Traffic programs
• Experience with conducting formal tests with a government agency / customer

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:

December 12, 2025

Pay Range:

Pay Range $87,100.00 - $157,450.00

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.