Principle Software Engineer C#

Description Leidos is seeking a Principal Software Engineer (C#) to work for the Security Enterprise Solutions (SES) business unit in Vista, CA. The SES business unit designs and manufactures highly complex security equipment used at border crossings, airports, seaports, and other transportation mechanisms. This role focuses on updating existing designs and introducing new products to expand our security detection line. Work Location & Schedule: Local to Vista, CA. Hybrid schedule: 3 days remote, 2 days onsite. Key Responsibilities Contribute to the design, development, testing, and maintenance of services, simulators, and diagnostics (WPF and Blazor) using C#. 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. Promote team buy‑in and shared ownership of technical solutions and processes. Develop secure software that adheres to industry security standards and enhances codebase compliance. Apply object‑oriented design principles, practices, and patterns to maintain a reusable and maintainable codebase. Implement Test‑Driven Development (TDD) and Continuous Integration for high‑quality, continuously tested code. Collaborate with Electrical Engineering, Mechanical Engineering, and Scientists to meet customer requirements. Evaluate customer problems, troubleshoot issues, and assist Field Service Engineers with problem resolution. Drive innovation by researching and integrating best practices to develop cutting‑edge solutions. Assist with business development efforts including concept solutioning/architecting, conops, estimating, and technical bid and proposal work. Communicate technical trade‑offs and solutions to non‑technical stakeholders. Develop project estimates for budgeting and scheduling, including sustaining engineering and technical debt remediation. Incorporate forward‑thinking strategies into estimates to support sustainable product lines. Report project status and issues to management as required. Required Skills BS Degree and 12+ years of experience or Master’s Degree with 10+ years of experience. Additional years may substitute for a degree. Ability to obtain a Public Trust clearance. Strong programming background with production product development experience in C#. 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. Effective communication and collaboration skills in cross‑functional team environments. Ability to explain technical trade‑offs and solutions to non‑technical stakeholders. Experience developing project estimates for budgeting and scheduling, including sustaining engineering and technical debt remediation. Willingness to travel abroad (typically Desired Skills Proficiency with AI‑based software development tools. Experience developing software that complies with industry security standards. Experience identifying code smells and using refactoring techniques. Proficiency with UML and documented design methodologies. Experience with revision control (e.g., Git), multi‑threading, TCP/IP networking, bus architectures, Web Services, Blazor, containers (Docker), Visual Studio, C++, SQL Server, and real‑time/embedded systems interfaces. Knowledge of image processing techniques. Compensation & Benefits Pay Range: $126,100.00 - $227,950.00. Benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave, and Retirement. Equal Employment Opportunity All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws. #J-18808-Ljbffr 6AM City, LLC