Leidos
Overview
Leidos
is seeking a
Principal Software Engineer (C#)
to work for the
Security Enterprise Solutions
(SES) business unit in Vista, CA. The SES unit designs and manufactures security equipment for border crossings, airports, seaports, and other transportation systems, including radiation detectors, spectrometers, X-ray and gamma ray scanners, and CT explosives detection equipment for airline passenger baggage. The goal is to update existing designs and introduce new products to the security detection product line, enabling safer, healthier, and more efficient travel and trade globally. We are seeking candidates local to Vista, CA that have the ability to work a hybrid schedule (3 days remote, 2 days onsite). Responsibilities
Technical Contribution and Collaboration:
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 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. Software Development and Security Compliance:
Develop software that adheres to industry security standards and enhances the security compliance of the codebase and coding practices; utilize object-oriented design principles to ensure reusable and maintainable code; apply Test-Driven Development (TDD) and Continuous Integration; collaborate with Electrical Engineering, Mechanical Engineering, and Scientists to meet customer requirements. Problem Solving and Innovation:
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. Business Development Support:
Assist with business development efforts, including concept solutioning/architecting, CONOPS, estimating, and technical bid and proposal work; evaluate and explain tradeoffs between cost, quality, and speed of delivery to less technical members of the business development team. Customer Interaction:
Interact with customers of varying technical levels to explain and defend approaches, limitations, and solutions; answer technical questions and collaborate with customers to develop solutions that meet their needs. Project Estimation and Sustainability:
Develop project estimates for budgeting and scheduling, including allocations for sustaining engineering, obsolescence management, and technical debt remediation; evaluate and recommend technical directions for sustaining and obsolescence activities to ensure long-term product viability; incorporate forward-thinking strategies to support sustainable product lines and reduce long-term risks. Communication and Reporting:
Communicate proactively within a small cross-functional development team and report project status and issues to management as required. Required Skills
BS Degree and 12+ years of experience or Masters Degree with 10+ years of experience; additional years of experience may be considered in lieu of a degree. Must have the ability to obtain a Public Trust clearance. Strong programming background with production product development experience in
C#
(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. Effective communication and collaboration skills in cross-functional team environments. Ability to explain technical tradeoffs and solutions to non-technical stakeholders. Experience developing project estimates for budgeting and scheduling, including allocations for sustaining engineering and technical debt remediation. Must be willing to travel abroad; if travel is necessary, typically it will be
Desired Skills
Proficiency with AI-based software development tools. Experience developing software that complies with industry security standards. Experience identifying code smells and utilizing refactoring techniques to reduce entropy in the codebase. 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 (e.g., Docker), Visual Studio, C++, SQL Server, and interfacing with real-time/embedded systems. Knowledge of image processing techniques. Additional Information
Check out the links below to learn more about Security Enterprise Solutions (SES) and related pages: https://careers.leidos.com/pages/security-enterprise-solutions https://www.leidos.com/markets/aviation/security-detection Original Posting
November 4, 2025 Pay Range
Pay Range $126,100.00 - $227,950.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include responsibilities, education, experience, knowledge, skills, and abilities, as well as internal equity, market data alignment, applicable bargaining agreements (if any), or other applicable law. About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit Leidos.com. Pay and Benefits
Pay and benefits are fundamental to any career decision. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at Leidos.com/careers/pay-benefits. Security Reminder
Be aware of fake employment opportunities using Leidos’ name. Leidos will never ask for payment-related information during the application process, nor will it advance money as part of hiring. If you receive a suspicious email, please contact LeidosCareersFraud@leidos.com. Discrimination Statement
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, disability, 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 qualified applicants with criminal histories consistent with relevant laws.
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Leidos
is seeking a
Principal Software Engineer (C#)
to work for the
Security Enterprise Solutions
(SES) business unit in Vista, CA. The SES unit designs and manufactures security equipment for border crossings, airports, seaports, and other transportation systems, including radiation detectors, spectrometers, X-ray and gamma ray scanners, and CT explosives detection equipment for airline passenger baggage. The goal is to update existing designs and introduce new products to the security detection product line, enabling safer, healthier, and more efficient travel and trade globally. We are seeking candidates local to Vista, CA that have the ability to work a hybrid schedule (3 days remote, 2 days onsite). Responsibilities
Technical Contribution and Collaboration:
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 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. Software Development and Security Compliance:
Develop software that adheres to industry security standards and enhances the security compliance of the codebase and coding practices; utilize object-oriented design principles to ensure reusable and maintainable code; apply Test-Driven Development (TDD) and Continuous Integration; collaborate with Electrical Engineering, Mechanical Engineering, and Scientists to meet customer requirements. Problem Solving and Innovation:
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. Business Development Support:
Assist with business development efforts, including concept solutioning/architecting, CONOPS, estimating, and technical bid and proposal work; evaluate and explain tradeoffs between cost, quality, and speed of delivery to less technical members of the business development team. Customer Interaction:
Interact with customers of varying technical levels to explain and defend approaches, limitations, and solutions; answer technical questions and collaborate with customers to develop solutions that meet their needs. Project Estimation and Sustainability:
Develop project estimates for budgeting and scheduling, including allocations for sustaining engineering, obsolescence management, and technical debt remediation; evaluate and recommend technical directions for sustaining and obsolescence activities to ensure long-term product viability; incorporate forward-thinking strategies to support sustainable product lines and reduce long-term risks. Communication and Reporting:
Communicate proactively within a small cross-functional development team and report project status and issues to management as required. Required Skills
BS Degree and 12+ years of experience or Masters Degree with 10+ years of experience; additional years of experience may be considered in lieu of a degree. Must have the ability to obtain a Public Trust clearance. Strong programming background with production product development experience in
C#
(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. Effective communication and collaboration skills in cross-functional team environments. Ability to explain technical tradeoffs and solutions to non-technical stakeholders. Experience developing project estimates for budgeting and scheduling, including allocations for sustaining engineering and technical debt remediation. Must be willing to travel abroad; if travel is necessary, typically it will be
Desired Skills
Proficiency with AI-based software development tools. Experience developing software that complies with industry security standards. Experience identifying code smells and utilizing refactoring techniques to reduce entropy in the codebase. 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 (e.g., Docker), Visual Studio, C++, SQL Server, and interfacing with real-time/embedded systems. Knowledge of image processing techniques. Additional Information
Check out the links below to learn more about Security Enterprise Solutions (SES) and related pages: https://careers.leidos.com/pages/security-enterprise-solutions https://www.leidos.com/markets/aviation/security-detection Original Posting
November 4, 2025 Pay Range
Pay Range $126,100.00 - $227,950.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include responsibilities, education, experience, knowledge, skills, and abilities, as well as internal equity, market data alignment, applicable bargaining agreements (if any), or other applicable law. About Leidos
Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit Leidos.com. Pay and Benefits
Pay and benefits are fundamental to any career decision. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at Leidos.com/careers/pay-benefits. Security Reminder
Be aware of fake employment opportunities using Leidos’ name. Leidos will never ask for payment-related information during the application process, nor will it advance money as part of hiring. If you receive a suspicious email, please contact LeidosCareersFraud@leidos.com. Discrimination Statement
All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, disability, 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 qualified applicants with criminal histories consistent with relevant laws.
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