Top Senior C# Jobs in Washington, DC

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

Design, build, and maintain cloud-native full-stack applications and backend services that support investment risk analysis. Own end-to-end delivery, contribute to architecture, apply automated testing and CI/CD, collaborate with stakeholders, reduce technical debt, and ensure reliable, observable data and analytics for portfolio risk and simulations.

Senior full‑stack .NET engineer responsible for design through production of secure, scalable web applications. Work includes C#/.NET backend, WPF/WCF components, REST APIs, frontend JS/HTML/CSS, cloud migration, code reviews, testing, and performance/security analysis. Expected to lead architecture, collaborate with teams, and apply SOLID, OOP, and SOA principles.

Develop and maintain Ruby and Rails applications, write Bash scripts, troubleshoot performance and multithreading issues, optimize SQL/MySQL queries, administer Unix/Linux/Solaris servers, and collaborate in Agile teams. Participate in API and SOA development and use source control (SVN/Git).

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

Design and develop solutions using Power Apps and Power Automate. Lead design sessions, implement data models, and manage solution lifecycles. Mentor junior developers and ensure adherence to governance best practices.

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

Design and implement runtime protocols, formats, and systems to capture, serialize, stream, and replay interactive 3D content across engines. Own C++ runtime and C# APIs across editor, build, simulation, streaming, and playback. Optimize for low-latency, determinism, memory and bandwidth constraints, and build AI interfaces for inspecting and invoking engine state.

As a Senior Software Engineer, you'll design architecture, mentor engineers, and drive the adoption of AI practices to enhance development workflows and system reliability.

Design, develop, and review software as part of an Agile scrum team. Collaborate with architects, QA, analysts, and customers to build large-scale hosted applications, contribute to security and risk assessments, resolve operational issues, and participate in on-call support and deployments.

Participate in all SDLC phases on a scrum team to design, develop, test, and deploy large-scale healthcare applications. Collaborate with architects, QA, product and clinical analysts, contribute to security and risk assessments, interact with customers to resolve issues, and support on-call/operational needs.

The role involves designing, developing, and testing applications using .NET technologies, building APIs, and implementing AI/ML solutions. Responsibilities include contributing to architectural decisions and mentoring team members.

Lead architecture and design for highly available, low-latency cloud services. Drive AI-first engineering practices, evaluate and integrate AI-assisted development tools, mentor engineers, perform code and architecture reviews, and collaborate with Product and Design to build scalable, observable, and automated systems.

Design, build, deploy, and operate backend services, APIs, integrations, and web applications. Own end-to-end features, improve CI/CD and observability, troubleshoot cross-service issues, participate on-call, and collaborate with product and leadership to deliver reliable production systems.

Develop and maintain cloud-based enterprise web applications using React, C#/.NET and/or Python. Build RESTful APIs, work with SQL Server/PostgreSQL, participate in CI/CD and Azure deployments, troubleshoot production issues, follow secure coding and accessibility standards, and collaborate on Agile teams.

Design, build, and lead enterprise Power Platform solutions (Power Apps, Power Automate, Dataverse, Power BI). Drive architecture, integrations, PCF and C# extensibility, DevOps/ALM, governance, stakeholder workshops, troubleshooting, and documentation while mentoring teams and shaping platform strategy for a federal client.

Lead technical design, development, modernization, and deployment of enterprise web applications on Azure Government and Microsoft 365. Mentor teams, enforce standards, implement CI/CD and DevSecOps, migrate legacy systems, develop Python/ASP.NET backends and React frontends, manage databases (SQL Server/PostgreSQL), and ensure security/compliance (FISMA, NIST, ATO).

As a Senior Software Engineer in Test Automation, you'll design automation frameworks, develop CI/CD pipelines, and ensure the quality of VR training products.

Design, develop, and deliver end-to-end full‑stack solutions using modern frameworks and languages. Work across front-end and back-end (UIs, middleware, services, APIs), collaborate on Agile Scrum teams, use SQL/NoSQL databases, and support production-ready systems. Must be able to obtain Public Trust vetting. Position in Atlanta, GA.

Design, build, test, and maintain full-stack web applications for a federal client using C#, .NET, ASP.NET, Entity Framework, SQL Server, and React. Develop secure, scalable backend APIs, responsive front-end interfaces, integrate third-party services, remediate vulnerabilities, participate in SDLC activities, and collaborate with clients and teammates on architecture, performance, and deployment.

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

Design, develop, and maintain Model-Driven Power Apps and integrations on Dynamics 365/Dataverse. Build PCF controls, plug-ins, Power Automate flows, and Power BI reports. Troubleshoot production issues, manage source control and releases in GitHub, implement security models, and collaborate with stakeholders in an Agile environment for secure, scalable enterprise solutions.

Lead cloud migrations and modernization for federal applications across AWS and Azure. Architect scalable, secure IaaS/PaaS/SaaS solutions, implement containerized microservices and automated CI/CD pipelines, drive observability and performance using tools like New Relic and Splunk, and lead agile teams through DevSecOps practices.

Design, architect, and develop model-driven PowerApps and Dataverse environments. Build Power BI reports, Power Automate workflows, custom C# Dataverse plug-ins, PCF controls using JavaScript/TypeScript, and CI/CD pipelines. Lead client solutioning, mentor developers, and drive modernization and automation initiatives across the Power Platform.

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.