Senior Software Engineer

Leidos • Gaithersburg, MD

22d • Hybrid

About The Position

Leidos is seeking a Software Engineer to be based in Gaithersburg, MD; Eagan, MN; or Egg Harbor, NJ. 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 50% hybrid schedule between 2-3 days in the office per week.

Requirements

• Bachelor’s degree in Computer Science or related field with 4–8 years of relevant experience OR Master’s degree with 2–6 years of relevant experience
• Ability to obtain and maintain a Public Trust clearance
• Strong object-oriented programming experience
• Proficiency in C and/or C++
• Experience developing real-time, multi-threaded, high-availability systems
• Experience with Linux environments (Red Hat), virtual machines, and hypervisors
• Experience with low-level communications protocols (TCP/IP, UDP, SCTP)
• Experience with hardware or complex system integration
• Familiarity with system maintenance and lifecycle concepts
• Experience with source control and configuration management tools
• Strong understanding of modern software development principles and best practices
• Ability to plan and prioritize work effectively in a fast-paced environment
• Strong verbal and written communication skills
• Demonstrated ability to work independently and collaboratively
• US Citizenship Required

Nice To Haves

• Experience with Ada
• Experience with test automation frameworks
• Familiarity with AI coding tools and agents (Codex, Claude, or similar)
• Experience with Agentic and AI-assisted development workflows, including vibe coding
• Familiarity with AI-enabled CI/CD, testing, code review, and DevSecOps
• Understanding of AI-generated code validation, security, and responsible use

Responsibilities

• Design, develop, test, and maintain software for real-time, high-availability systems
• Lead software development activities independently and as part of a collaborative engineering team
• Analyze complex system requirements and translate them into efficient, maintainable software designs
• Apply sound software engineering principles to ensure code is reliable, fault tolerant, reusable, and maintainable
• Lead and mentor junior developers, influencing technical direction and development processes
• Participate in Agile ceremonies including daily stand-ups, release planning, and sprint reviews
• Develop, tune, document, and deploy automation scripts across development, test, and production environments
• Promote code reuse, cross-program collaboration, and sustainable development practices
• Support system integration activities, including hardware and low-level communications interfaces

Benefits

• You’ll contribute to software systems where reliability, performance, and precision are essential.
• This is an opportunity to work on mission-critical infrastructure supporting national airspace operations — collaborating with experienced engineers to modernize complex, real-world systems.
• If you are motivated by solving technically challenging problems in regulated, operational environments, we encourage you to apply.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior