Full Stack .NET Developer

Leidos is hiring a Full Stack .NET Developer to support NIH Center for Scientific Review (CSR) operations by building and modernizing user interfaces, APIs, business services, and data integrations. This hybrid role is based in Bethesda, MD (with a local DC Metro area requirement) and spans on-premises and approved Azure Government environments. You will also work with Azure AI and identity integration while following appropriate access controls and NIH restrictions for generative AI use in peer review.

What you’ll do

• Design, develop, test, and maintain responsive web applications across the front end, .NET services, APIs, and database layers.
• Build accessible dashboards and interfaces for workflows including application referral, study section administration, reviewer coordination, and reporting.
• Develop C# and ASP.NET applications, REST APIs, Azure Functions, and Logic Apps.
• Create application middleware for authentication, authorization, API security, and integrations with external identity providers.
• Develop and evaluate AI-enabled features using Microsoft Foundry (formerly Azure AI Foundry), Azure AI Search, and Azure AI services, including testing, human review, and appropriate access controls.
• Protect confidential application and review information and follow NIH restrictions on generative AI use in peer review.
• Maintain and modernize existing Windows services, console applications, SOAP/WCF integrations, and SQL scripts.
• Collaborate with business stakeholders, designers, architects, DBAs, testers, and operations staff in an Agile Scrum environment.
• Use automated testing, code review, and GitHub Actions (or comparable CI/CD tools) with secure DevSecOps practices.

What you’ll bring

• Be local to the DC Metro area for hybrid/onsite work in Bethesda, MD, with a minimum of 2 days per week onsite.
• Be a US Citizen or Green Card holder with the ability to obtain a Public Trust.
• Hold a Bachelor’s degree in Computer Science, Information Technology, or a related field, plus 3+ years of relevant software development experience.
• Strong full stack experience with C#, ASP.NET MVC, .NET/.NET Core, REST APIs, Entity Framework, ADO.NET, and SQL Server.
• Hands-on front-end experience with HTML5, CSS3, JavaScript, Bootstrap, jQuery, and AJAX, including responsive design and accessibility.
• Experience deploying .NET applications in Azure, including Azure Functions and Web APIs.
• Practical Azure AI development experience: integrating AI services via .NET APIs, implementing search or retrieval features, evaluating output quality, and securing AI data flows.
• Experience implementing authentication and authorization middleware using OAuth 2.0 and OpenID Connect, including integration with Login.gov or a comparable identity provider.
• Experience with single sign-on, token validation, claims-based or role-based access control, and securing APIs and user sessions.
• Strong SQL Server and T-SQL skills, including stored procedures and data integration.
• Proficiency with Git, automated testing, CI/CD, and secure coding practices.
• Strong communication skills and ability to work across technical and business teams.

Benefits

• Health and Wellness programs
• Income Protection
• Paid Leave
• Retirement

Pay range

$69,550.00 - $125,725.00 per year.

Additional details

• Location: Bethesda, MD (hybrid)
• Original posting: October 16, 2026
• US positions: Leidos reasonably anticipates the requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date.