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Principal Software Engineer C#

Leidos

$126,100 - $227,950
Sep 11, 2025
Remote, US
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Leidos is seeking to update existing designs and introduce new products to their security detection product line to make travel and trade safer, healthier, and more efficient globally. The Principal Software Engineer will develop and maintain cargo inspection detection systems for the Ports and Borders group.

Requirements

  • Strong programming background with production product development experience in C-Sharp required.
  • Mastery of object-oriented design (OOD) principles and practices.
  • Proven experience in software architecture and leadership roles.
  • Expertise in Agile methodologies, including TDD and Continuous Integration.
  • Ability to create design documentation, requirements specifications, and other technical documentation.
  • Strong troubleshooting and bug-fixing skills.
  • Proficiency with revision control (e.g., Git), multi-threading, TCP/IP networking, bus architectures, Web Services, Blazor, containers (e.g., Docker), Visual Studio, C++, SQL Server, and interfacing with real-time/embedded systems.

Responsibilities

  • Contribute to the design, development, testing, and maintenance of services, simulators, and diagnostics (WPF and Blazor) using C-Sharp.
  • Provide technical leadership by guiding architectural decisions, fostering team collaboration, and ensuring alignment with best practices.
  • Lead the adoption of tools, including AI-based software development tools, to enhance productivity and innovation.
  • Develop software that adheres to industry security standards and enhances the security compliance of the codebase and coding practices.
  • Utilize object-oriented design principles, practices, and patterns to ensure the codebase is reusable and maintainable.
  • Apply Test-Driven Development (TDD) and Continuous Integration to ensure high-quality, continuously tested code.
  • Evaluate customer problems, troubleshoot issues, and assist Field Service Engineers with problem resolution.

Other

  • We are seeking candidates local to Vista CA that have the ability to work a hybrid schedule (3 days remote, 2 days onsite)
  • Must have the ability to obtain a Public Trust clearance.
  • Effective communication and collaboration skills in cross-functional team environments.
  • Ability to explain technical tradeoffs and solutions to non-technical stakeholders.
  • Must be willing to travel abroad. If travel is necessary, typically it will be < 10%.