Senior Software Engineer Jobs

Software Engineer

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. Location This is a U.S.-based position that offers a balanced 50% hybrid schedule between 2-3 days in the office per week.

What You'll Do

• 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

Required Qualifications

• 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

Preferred Qualifications

• 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

Why Leidos 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. 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.