Top Senior C# Jobs in Washington, DC

Lead architecture and full-stack development for scalable applications, including interactive dashboards, backend microservices, APIs, data integrations, AI-enabled features, MFT orchestration, and cloud-native DevOps infrastructure. Establish monitoring and operational standards, resolve complex production issues, guide technical strategy, mentor engineers, and collaborate with product leadership on technical roadmaps.

Build and maintain full-stack web applications, interactive dashboards, backend integration services, resilient APIs, and AI-enabled features. Collaborate with engineering, data, product, and DevOps teams to integrate databases, automate deployments, troubleshoot cloud and hybrid environments, and scale enterprise application capabilities. Apply modern frontend, backend, DevOps, data visualization, and continuous delivery practices.

Designs, develops, deploys, and supports scalable MuleSoft API-led integrations using CloudHub and Anypoint Platform. Builds REST and SOAP services connecting enterprise applications, Salesforce, databases, and cloud systems. Creates DataWeave transformations, MUnit tests, API security policies, and CI/CD deployments. Troubleshoots integration issues, optimizes performance, monitors applications, and contributes to API design, documentation, code reviews, and architecture discussions within Agile teams.

Develops, integrates, tests, deploys, maintains, and troubleshoots enterprise software across Microsoft platforms. Translates stakeholder requirements into secure web, desktop, cloud, API, and Microsoft 365 solutions. Builds AI-enabled and generative AI applications using LLMs, supports enterprise integrations, evaluates development standards and technologies, and provides technical leadership across projects. The role also collaborates with vendors, documents systems, supports lifecycle roadmaps, and advises legal and administrative stakeholders.

Develop and integrate custom-coded network monitoring and management tools using APIs, dashboards, databases, and enterprise technologies. Design, configure, test, document, and deploy solutions supporting global Cisco and Microsoft network environments. Collaborate with network engineers, DBAs, technical SMEs, customers, and contractor management while evaluating existing systems and recommending solutions. The role requires customer interaction, independent work in a small team, and support of Department of State network operations on secured hardware.

Develop and maintain C#/.NET applications throughout the software development lifecycle, including requirements analysis, architecture, coding, testing, debugging, integration, and configuration. Collaborate with clients and team members to prioritize development backlogs and plan releases. Build reliable, reusable code, analyze system requirements, and support applications using .NET technologies, SQL, APIs, JavaScript, and related systems.

Develops, tests, maintains, and troubleshoots enterprise and government Java applications. Designs APIs, supports architecture and documentation, integrates Java and .NET technologies, and contributes to CI/CD automation. Collaborates with analysts, QA, administrators, and stakeholders while ensuring application security, performance, reliability, and compliance with government standards. Requires Java, Spring, database, API, and Microsoft technology experience in a structured, compliance-driven environment.

Designs, develops, tests, deploys, and enhances Microsoft Power Platform applications and automated solutions. Translates user stories into secure, maintainable technical implementations using Power Apps, Power Automate, databases, web technologies, APIs, and low-code platforms. Responsibilities include agile collaboration, unit testing, troubleshooting, performance validation, documentation, training, knowledge transfer, and application security.

Develop and maintain Microsoft 365 solutions, including SharePoint architectures, Power Automate workflows, Power Apps interfaces, Power BI reporting, and data structures. Troubleshoot workflow, permissions, data, Excel, Access, and VBA issues; support data governance, migrations, testing, version control, and AI-connected workflows. Serve as a technical subject-matter expert, document solutions, gather requirements, and communicate technical decisions to business partners.

Develop, test, deploy, maintain, and support enterprise software applications for a government customer. Responsibilities include designing application architectures, building front-end, business logic, REST API, and database components, creating Power BI reports, automating testing with Selenium, troubleshooting production issues, and assisting with deployments, configuration, upgrades, and documentation in an Agile Kanban environment.

Designs, integrates, deploys, and troubleshoots autonomy and vehicle-intelligence systems across embedded hardware and software platforms. Responsibilities include integrating sensors, autopilots, datalinks, PNT/GPS/INS, and ground control stations; supporting UAV flight tests; conducting SIL and HIL validation; collaborating with vendors and defense customers; and delivering customer demonstrations. The role requires strong C++ development, robotics integration, networking, embedded Linux, and eligibility for a U.S. security clearance.

Leads Agile full-stack engineering teams through design, development, testing, deployment, and support. Guides architecture, code quality, mentoring, technical risk management, operational priorities, and cross-functional delivery. Develops secure enterprise applications using Java, Angular, .NET, AWS, Docker, EKS, databases, Kafka, and CI/CD tooling. Coordinates with federal stakeholders, vendors, cybersecurity, infrastructure, and identity teams while supporting change management, incident response, governance, and production troubleshooting.

Build and maintain scalable full-stack web applications using .NET, React, Next.js, and Azure. Responsibilities include feature delivery, API and microservices development, testing, code reviews, architecture, performance optimization, security, CI/CD support, cloud deployment, and production support. Senior engineers will mentor teammates and influence engineering standards, while early-career engineers receive mentorship and progressively greater ownership.

Leads hands-on development of full-stack applications using .NET, React, Next.js, and Azure. Owns architecture, coding, code reviews, testing, security, reliability, observability, production support, and cloud deployment. Integrates AI and GenAI capabilities such as LLM features, RAG, semantic search, and agentic workflows. Mentors engineers, establishes technical standards, collaborates with stakeholders, supports hiring, and helps deliver scalable, secure software.

Develop and support applications using Oracle, SQL Server, MySQL, PostgreSQL, Node.js, TypeScript, and emerging cloud and AI technologies. Build database procedures, functions, packages, web service integrations, and application-to-database solutions. Collaborate with stakeholders and technical teams, incorporate user feedback, support multiple initiatives, and solve complex application development problems. The hybrid role supports DIA in Washington, D.C., requires TS/SCI clearance and willingness to take a CI polygraph.

Develop, test, deploy, and maintain full-stack web applications using .NET and React. Design scalable front-end and back-end solutions, troubleshoot technical issues, participate in code reviews, and follow software development best practices. Collaborate with designers, product managers, and developers throughout the software lifecycle. The role requires onsite work in Washington, DC and an active Top Secret clearance.

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

Performs ETL, backend database, data warehouse, and data pipeline testing. Develops Python- and SQL-based automation frameworks, validates data transformations and quality across AWS and Databricks platforms, and executes integration, regression, performance, and reconciliation testing. Creates test plans, analyzes defects, supports Agile Scrum teams, and collaborates with developers, data engineers, and business analysts to deliver reliable enterprise data solutions.

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 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.

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

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