Top Senior .NET Developer Jobs in Washington, DC

Senior .NET Full Stack Developer responsible for designing, developing, testing, and enhancing enterprise .NET applications, integrating third‑party components, optimizing C#/ASP.NET code, automating operational workflows, and supporting large‑scale data processing and analytics. Works with lead architects across the SDLC and conducts architecture reviews, code reviews, and knowledge transfer.

Design, develop, and modernize enterprise web applications using .NET/ASP.NET/C#, SQL Server, and modern front-end technologies. Perform testing, troubleshooting, performance tuning, collaborate with cross-functional teams, and support secure, mission-critical government systems.

The .Net Developer will support business functions by developing, implementing, and maintaining applications, collaborating in a Scrum Team, and ensuring software meets specifications.

The Sr. .NET Developer will support business functions by developing, implementing, and maintaining application systems, focusing on BI tools and Web APIs.

Design, build, test, and deploy full-stack web applications using the .NET framework. Collaborate with cross-functional teams, write maintainable code, perform unit/integration testing, troubleshoot issues, participate in code reviews, and ensure application performance, quality, and responsiveness.

The Senior .NET Developer will modernize applications, enhance legacy systems, lead Agile activities, and mentor junior developers while utilizing backend technologies.

The Senior Software Engineer will focus on integrating Sage Intacct with core business processes, developing backend services, and maintaining integration systems. Responsibilities include designing, building, and supporting secure integration solutions, as well as collaborating with stakeholders on technical requirements.

The Senior Backend Engineer will develop backend solutions using .NET/C# and modern architecture, focusing on cloud services and databases, while managing client projects.

The Staff Software Engineer will design .NET infrastructure, automate builds, maintain tooling for .NET libraries, and mentor peers while ensuring security and reliability.

The Senior Software Engineer will lead the architecture and development of secure, automated build systems for .NET libraries, mentor peers, and collaborate on infrastructure improvements.

As a Senior Software Engineer at PerfectServe, you'll design, build, and maintain high-quality code for healthcare communication systems, mentoring junior engineers and collaborating across teams to improve patient care and clinical workflows.

Develop and maintain scalable software solutions, mentor developers, and integrate AI tools. Collaborate on technical solutions aligned with business goals.

Responsible for designing, developing, testing, and maintaining secure Java applications, providing leadership and mentorship, and ensuring compliance with SDLC frameworks.

Seeking a Senior Full Stack .NET Developer to work on a social good project, with strong skills in C#, AngularJS, design, and UX. Requires 5+ years of experience.

The Senior .NET Software Engineer will drive development of .NET software products, focusing on back-end engineering, code reviews, and collaborating with cross-functional teams.

The Staff Engineer will leverage 5+ years of experience in C#, JavaScript, and frameworks to lead and innovate solutions in a collaborative environment.

Develop and maintain high-quality software solutions, analyze requirements, and collaborate with project leaders to ensure deadlines are met while adhering to coding standards.

The Senior SharePoint .Net Developer will design, develop, and maintain SharePoint environments, troubleshoot production issues, and lead application development teams.

Lead a team to develop SaaS solutions while coding and mentoring engineers. Responsible for technical leadership and team management.

Design and develop scalable services/APIs using C#/.NET/.NET Core, collaborate during SDLC, mentor junior engineers, and ensure code quality.