Senior Software Developer

Explicitly mentions vibe coding and AI-assisted/agentic development workflows and lists AI coding tools (Codex, Claude).

Senior Software Developer responsible for designing, developing, and sustaining real-time, high-availability safety-critical systems for the UK National Airspace System Replacement program. The role is U.S.

-based with a 50% hybrid schedule and involves leadership, mentoring, system integration, and work with low-level communications and Linux environments.

Leidos is hiring a Senior Software Developer to support the UK National Airspace System Replacement Product Delivery Team (UK NASR PDT). The role focuses on building and sustaining real-time, high-availability, safety-critical software that supports national airspace operations.

• Design, develop, test, and maintain software for real-time, high-availability systems.
• Lead software development activities and collaborate within an engineering team.
• Analyze complex system requirements and translate them into maintainable software designs.
• Apply sound software engineering principles to ensure reliability, fault tolerance, reusability, and maintainability.
• Mentor and lead junior developers; influence technical direction and development processes.
• Participate in Agile ceremonies (daily stand-ups, release planning, 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.

• Bachelor’s degree in Computer Science or related field with 8-12 years of relevant experience, OR Master’s degree with 6-10 years of relevant experience.
• Ability to obtain and maintain a Public Trust clearance; US citizenship required.
• Strong object-oriented programming experience and 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 and lifecycle concepts.
• Experience with source control and configuration management tools.
• Strong understanding of modern software development principles and best practices.
• Strong verbal and written communication skills and ability to plan and prioritize work.

• Experience with Ada.
• Experience with test automation frameworks.
• Familiarity with AI coding tools and agents (e.g., Codex, Claude) and Agentic/AI-assisted development workflows, including vibe coding.
• Familiarity with AI-enabled CI/CD, testing, code review, and Dev Sec Ops  practices.
• Understanding of AI-generated code validation, security, and responsible use.

• U.S.
  
  -based position located in Gaithersburg, MD;
  Eagan, MN; or Egg Harbor, NJ.
• Balanced 50% hybrid schedule (2-3 days in the office per week).

• Pay Range: $ - $.
• Employment benefits include competitive compensation, health and wellness programs, income protection, paid leave, and retirement.

C C++ Ada Linux (Red Hat) TCP/IP UDP SCTP Virtual Machines Hypervisors Source control and configuration management tools CI/CD Dev Sec Ops  Test automation frameworks Codex Claude AI-enabled CI/CD, testing, and code review

System Design Real-time Systems Multi-threading Safety-critical Systems Object-oriented Programming Linux System Administration Low-level Networking Hardware/Systems Integration Software Architecture Mentoring Agile Automation Scripting Configuration Management Testing and Test Automation Dev Sec Ops  Communication Planning and Prioritization

Senior

USD 107,/year

Full-time