Top C# Jobs in Washington, DC

Lead engineering teams as a Technical Product Owner/Engineering Manager to deliver enterprise-grade software. Own product roadmaps, stakeholder relationships, architecture (APIs, microservices), CI/CD and quality practices, project planning, budgeting, and mentorship to drive scalable, reliable solutions.

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.

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 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.

Lead design and implementation of cloud-native solutions to modernize P&C underwriting, policy administration, and claims. Drive cloud transformation, secure architectures, data-driven automation, mentor teams, manage client relationships, and oversee project delivery and continuous improvement.

Lead design and implementation of automated test frameworks and V&V for web, API, data, and backend systems. Integrate testing into CI/CD, support audit readiness and compliance (ASME NQA-1), manage defects and root-cause analysis, and drive quality metrics, documentation, and continuous improvement across engineering teams in a regulated nuclear environment.

Develop and support an ETRM front-office system for multiple commodities. Create POCs, design documents, integrations with third-party trading platforms, and collaborate with trading, risk, operations, and accounting. Implement scalable Java web applications, manage app servers, CI/build tools, and participate in Agile practices including pair programming and automated testing.

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.

Senior Dynamics 365 developer to enhance and maintain a Model-Driven Power Apps solution. Responsibilities include customizations, PCF control development, plug-ins, integrations, Power Automate workflows, Dataverse configuration, Power BI reporting, security management, troubleshooting, and supporting Agile delivery and deployments.

Lead development and modernization of a DevSecOps "Run and Release" platform: build .NET backend microservices, integrate CI/CD gating with GitHub Actions and ADO, provision Azure infrastructure with Terraform, script automations in Python, manage Postgres and MongoDB data flows to Databricks/ADLS, enforce supply-chain security (JFrog, Vault, LaunchDarkly), and implement Splunk monitoring. Participate in on-call rotation and reduce technical debt to improve secure software delivery.

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.

The SharePoint Developer will design systems, develop custom PowerApps, collaborate with government staff, and improve existing applications while ensuring security and quality in software development.

Lead .NET Core microservices architecture and backend quality, direct an offshore backend pod, design Azure SQL cache and REST APIs, implement Service Bus integrations, own CI/CD security gating, run demos, triage defects, and conduct client handoffs.

As a Staff Software Engineer, you will lead technical strategies, develop APIs and microservices, and mentor engineers for innovation at GEICO.

Design, implement, and operate firmware and system software for large-scale Azure server fleets. Debug hardware and firmware (SoC, BIOS, BMC, GPU), integrate telemetry, evaluate and apply AI/ML (LLMs, embeddings, RAG) for hardware improvements, drive RCA-based improvements, support live service operations, and contribute to testing, automation, and compliance to meet SLAs.

Develop, test, deploy, and support enterprise applications in secure classified environments. Build APIs, integrations, and application services, participate in Agile sprints, support DevSecOps/CI-CD pipelines, troubleshoot defects and performance issues, produce technical documentation, and implement secure coding and remediation practices.

The Senior Software Development Engineer will design and implement scalable web services, collaborate across teams, and ensure software simplicity while participating in the full software development lifecycle.

Develop Temporal workflows and Go services to automate cloud operations, build reliable SRE platforms, participate in on-call/incident response, debug distributed systems, and enable self-service through documentation and CI/CD automation.

Design, build, and maintain scalable data pipelines, backend services, and data governance to enable real-time decisioning, reporting, and high-quality data products. Ensure secure, well-tested code, collaborate cross-functionally, and support data quality, security, and CI/CD for analytics and AI use cases.

Design, develop, enhance, and maintain enterprise geospatial applications, web-based GIS interfaces, dashboards, workflows, and APIs; support ArcGIS Enterprise/Server, integrations, testing, deployment, performance tuning, documentation, cybersecurity, and user support within a federal environment.

Lead design, development, enhancement, and maintenance of enterprise geospatial applications and APIs. Implement ArcGIS Enterprise solutions, web GIS apps, dashboards, integrations, and ensure compliance with federal IT, cybersecurity, and privacy requirements while guiding development teams and supporting testing, deployment, and O&M.

Design, develop, and implement Microsoft Power Platform solutions (Power Apps, Power Automate, Power BI, Dataverse) and UiPath RPA across all project phases. Provide technical SME support, architecture, integrations, end-user training, documentation, and production support. Lead demos, follow CoE/governance standards, collaborate with stakeholders, and ensure high-quality, secure deployments for clients.

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

Develop, enhance, and maintain backend web applications and services using C#/.NET. Implement features with ASP.NET, Entity Framework, and SQL Server; write unit and integration tests; perform troubleshooting, code reviews, vulnerability remediation, and O&M tasks while collaborating with senior engineers and cross-functional teams.

Design, build, test, and deploy wargame-specific software and integrated GIS-based common operating picture tools. Create multi-user front-end interfaces, integrate and dynamically update databases, and support planning, execution, and post-game analysis for HQ USAF wargames.