Top C# Jobs in Washington, DC

Lead design, development, integration, and validation of complex ground-system software. Define software architecture, derive and trace software requirements, participate in system reviews, collaborate with hardware/network/test teams, and support customer-facing technical deliverables.

As a Mixed Reality Developer, you will create high-performance Mixed Reality applications, collaborating with cross-discipline teams to deliver innovative solutions for mission-critical operations.

Lead engineering and program management efforts for software solutions, mentor teams, oversee project planning, and ensure client satisfaction.

The Senior Software Developer will create and maintain software solutions for U.S. Navy weapon systems, ensuring quality and reliability through testing, code reviews, and collaboration with stakeholders.

Technical Services Engineers at MongoDB solve complex database problems for customers, requiring deep technical skills and customer service expertise. They work on architecture, performance, and support tools, engage with clients on technical queries, and contribute to projects within the MongoDB ecosystem. The role demands a mix of systems and storage engineering experience, coding skills, and a collaborative spirit.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed systems and hardware/software, manage CI/CD pipelines, debug and optimize real-time multi-threaded systems, guide end-to-end integration and verification, mentor engineers, and evaluate new technologies to improve system performance.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed systems and simulation tools, own CI/CD pipelines, debug real-time multi-threaded systems, mentor engineers, and drive end-to-end integration across simulation and operational platforms.

Design, implement, and maintain C++ and Python software for cross-platform, distributed real-time systems. Contribute to system architecture, APIs/messaging (gRPC/REST/ZeroMQ), CI/CD, automated testing, and integration of third-party simulation and hardware. Debug threading/timing issues and improve development workflows.

Design, implement, and maintain C++ and Python software for cross-platform, distributed real-time systems. Integrate third-party software/hardware and simulation tools, develop APIs/messaging (gRPC/REST/ZeroMQ), debug threading/timing issues, and improve CI/CD pipelines with Docker, CMake, Conan, and GitLab CI while practicing test-driven development and collaboration.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed and real-time systems, own CI/CD and build tooling, debug multi-threaded systems, guide cross-team integration and mentor engineers, and evaluate new technologies to improve simulation and autonomy platforms.

Lead design and integration of high-performance C++ and Python systems across distributed, real-time environments. Own CI/CD, containerization, build tooling, messaging/APIs, and debugging. Drive end-to-end integration, mentor engineers, set technical direction, and evaluate technologies to improve system performance and stability in autonomy and simulation domains.

Design, develop, and field high-performance Ground Control Station and C2 software using C++/Qt/QML and QGroundControl. Lead architecture and technical direction, mentor engineers, define APIs/ICDs, debug integration/latency issues, support field tests, implement post-mission debrief tools, and ensure interoperability with C2 standards.

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

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.

Develop and maintain C# automation to audit, extract, parse, compare, and publish data across multiple datasets and SQL databases. Build automated audit reports, test automation in varied environments, collaborate with QA and development teams to identify and resolve issues, deploy solutions across servers and domains, document processes, and continually improve automation frameworks and practices.

Designs, develops, and deploys AI-driven, cloud-native applications on Azure. Builds RAG knowledge systems, AI agents, secure APIs, and orchestrated workflows using C#, .NET, Azure services, Docker, and CI/CD. Collaborates with stakeholders, ensures observability and security, supports production incidents, and provides documentation and knowledge transfer.

Design, build, and maintain scalable automated test frameworks and tools; deploy and maintain CI/CD pipelines; create and run functional, performance, and end-to-end automated tests; debug and track defects; expand test coverage using code analysis; collaborate with engineering to ensure timely, low-regression releases.

Design, build, test, integrate, secure, and maintain mission-focused software for classified national security and law enforcement programs. Develop APIs, databases, features, and scripts; participate in Agile delivery, release preparation, production support, troubleshooting, and documentation. Mentor team members and drive modernization, automation, and technical debt reduction.

Design, develop, test, maintain, and support secure software applications for classified missions. Support CI/CD, DevSecOps, source control, automated testing, release management, and production troubleshooting. Contribute to Agile ceremonies, documentation, and system support. Mentor team members and identify modernization, automation, and technical debt reduction opportunities to improve mission application reliability and security.

The Jr. SQL Developer will work on MS SQL Server, performance tuning, software design, development, testing, and debugging. Participate in the full project lifecycle.

The Jr. SQL Developer will work with MS SQL SERVER, focusing on database performance tuning, software design, and project lifecycle participation under the guidance of a Project Manager.

Develop and prototype interactive, data-driven applications for Digital Twin and modeling & simulation platforms. Build modular, microservices-based solutions across cloud and on-prem environments, integrate UI assets, implement backend APIs and databases, and collaborate with DevSecOps and senior engineers to evolve prototypes into production-ready systems supporting mission needs.

Design, develop, test, and maintain scalable Java applications for government and enterprise systems. Build and integrate APIs, contribute to architecture and documentation, ensure performance and security, support CI/CD deployments, troubleshoot production issues, and ensure compliance with government standards.

Develop and enhance GIS capabilities within a core C++ OMS application, configure map services, design cartography, integrate spatial databases, resolve spatial data issues, and collaborate with product teams using Jira and GitHub.

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