Top Senior C# Jobs in Washington, DC

As a Modeling and Simulation Engineer, you will design advanced models, perform quantitative analysis, and support national defense initiatives.

Seeking a Senior IT Developer/Engineer with extensive experience in .NET technologies, Oracle databases and software development lifecycle, to lead design and coding efforts.

The role involves full-stack development on financial technology solutions, focusing on user-facing applications, internal tools, and data pipelines, requiring collaboration across teams.

The Senior Applications Developer will design and implement software solutions, particularly using Angular, while ensuring quality and timely delivery of projects. Requires extensive software development experience and collaboration across teams.

Lead the development of web applications, guiding feature development from design to production, while mentoring a small Agile team and driving modernization initiatives.

The Lead Power Platform Developer/Architect will design scalable Power Apps solutions, lead technical teams, conduct architecture reviews, and ensure alignment with business objectives.

Lead the design and development of Windows desktop applications, focusing on architecture, accessibility, and best practices, ensuring quality and performance across releases.

The Java Developer will design, develop, test, and maintain Java applications for government systems, collaborate with teams, ensure compliance, and support application deployment.

The role involves developing cross-platform API abstractions for the Unity Editor using modern C++. Responsibilities include maintaining codebases and collaborating with worldwide teams.

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 Sailpoint Consultant will maintain and support SailPoint IIQ infrastructure, troubleshoot issues, develop scripts, and assist project teams with identity and access solutions.

The .Net Developer will build software applications, collaborate with team members, document technical specifications, and resolve software issues.

The .Net Developer will design, develop, and maintain software applications, lead initiatives, document requirements, and resolve software issues.

Develop and implement a modern web information portal using front-end technologies, ensuring compliance with UX and 508 standards. Collaborate with stakeholders and integrate systems while managing project timelines and quality.

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.

The Oracle PL/SQL Developer will provide infrastructure and back-end support, perform application testing and installation, and support user community by resolving database issues and performing UNIX administration functions.

The Senior Software Engineer will design and build scalable distributed systems, provide technical leadership, and engage in cross-functional collaboration while mentoring other engineers.

Develop backend services for Digital Twin platforms, focusing on orchestration, integration, and runtime behavior while collaborating with Unity developers and data teams.

Responsible for architecting solutions that align with CMS needs, managing complex programs, and mentoring future technologists while adhering to federal standards.

Design and implement digital solutions, write code, collaborate with teams, ensure software performance and security, and maintain documentation.

Develop, maintain, and operate enterprise applications on the .NET platform, ensuring compliance with standards and supporting CI/CD and DevSecOps tools.

The Senior Software Engineer will lead full-stack development, collaborate in agile teams, mentor junior engineers, and troubleshoot complex software issues.

Design, build, and scale the Substantiation Platform for validating and reconciling financial data. Provide architectural leadership and mentor engineers.