Top Senior C# Jobs in Washington, DC

Leads software engineering for tax technology solutions, overseeing architecture, coding, testing, deployment, project delivery, and AI-enabled innovation. Advises stakeholders, translates tax needs into scalable applications and microservices, evaluates technical tradeoffs, manages risks, and coaches engineering teams. Requires client collaboration, clear communication, systems thinking, and the ability to guide teams through complex and ambiguous situations.

Develop and support Microsoft Power Platform solutions and migrations for the FBI. Responsibilities include gathering requirements, designing user interfaces, conducting usability testing, building Power Apps, automating workflows with Power Automate, modeling data in Dataverse, integrating Microsoft and third-party services, and creating Power BI dashboards and reports.

Designs, develops, and maintains enterprise Power Platform solutions using Power Apps, Power Automate, Dataverse, and Power BI. Leads architecture, integrations, governance, ALM, security, DevOps deployments, and solution lifecycle management. Develops PCF controls, JavaScript/TypeScript components, and C# plugins; integrates Azure services and external systems. Conducts technical workshops, code reviews, documentation, and mentoring while collaborating with stakeholders, architects, product owners, and business analysts.

Modernize legacy Java and .NET applications by analyzing dependencies, preserving APIs and business behavior, building compatibility adapters, refactoring services, and supporting migration, testing, deployment, cutover, and retirement. The role also requires secure DevSecOps practices, documentation, production troubleshooting, stakeholder communication, and protection of classified and Controlled Unclassified Information in government environments.

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

Designs and delivers cloud-based software solutions with strategic customers and Microsoft product teams. Leads requirements definition, architecture, dependency identification, design documentation, and development of maintainable code. Mentors engineers, contributes to open-source assets, coordinates project and release plans, and serves as a designated responsible individual for system reliability, monitoring, on-call support, performance, and operational improvements.

Designs, develops, tests, deploys, and maintains enterprise solutions using Microsoft Power Platform. Builds Canvas and Model-Driven Apps, Power Automate workflows, Power Pages, and Dataverse solutions; integrates enterprise data sources and implements role-based security. Supports ALM, automated deployments, troubleshooting, optimization, testing, documentation, and user acceptance activities. Translates business requirements into scalable solutions, collaborates with technical and business stakeholders, presents designs, and provides guidance to junior staff.

Develop cross-platform native C++ abstractions for the Unity Editor across Windows, macOS, and Linux. Maintain and modernize the existing codebase, support new operating-system features and design guidelines, troubleshoot difficult platform issues using native debuggers, and collaborate with product managers and worldwide engineering teams to plan and deliver editor experiences.

Design and implement advanced modeling and simulation tools to evaluate system performance and support strategic decision-making for national defense. Perform quantitative analysis, develop physics-based and agent-based models, optimize AI and machine-learning algorithms, and collaborate with government clients. The role involves EO-IR and 3D simulation, computational modeling, and potentially high-performance computing, computer vision, and autonomous-system behavior development.

Build and maintain full-stack web applications, interactive dashboards, backend integration services, resilient APIs, and data visualizations. Integrate relational and NoSQL databases, DevOps automation, cloud platforms, and AI capabilities. Troubleshoot application, database, file transfer, connectivity, security, and hybrid-cloud issues while improving continuous delivery practices. Support payer operations by enriching metadata, automating lifecycle contracts, and measuring payer performance in an agile, collaborative environment.

Designs, architects, and leads delivery of enterprise applications, APIs, platforms, and AI-enabled solutions. Builds agentic workflows, LLM and RAG applications, integrations, data pipelines, and full-stack services across Azure and AWS. Establishes secure engineering, testing, CI/CD, observability, and reliability practices while addressing AI safety and governance. Partners with attorneys, product owners, AI and data teams, and executives to translate complex workflows into scalable solutions, lead architecture, mentor engineers, and drive initiatives from prototype through production.

Develop, test, deploy, and maintain full-stack web applications using .NET, React, and related technologies. Design front-end and back-end components, troubleshoot technical issues, conduct testing, participate in code reviews, and collaborate with cross-functional teams. The role requires onsite work at a Washington, D.C. government facility and involves secure federal projects.

Develop and maintain full-stack web applications using .NET, ASP.NET, React, and related technologies. Design front-end and back-end components, write and test scalable code, troubleshoot issues, participate in code reviews, and collaborate with cross-functional teams throughout the software development lifecycle. The role is onsite at a government facility in Washington, D.C., and requires an active Top Secret clearance with SCI and CI Poly eligibility.

Develop and maintain full-stack web applications using .NET and React. Design front-end and back-end components, write scalable code, conduct testing, troubleshoot issues, participate in code reviews, and collaborate with cross-functional teams throughout the software development lifecycle. The role requires active TS/SCI clearance, U.S. citizenship, a bachelor’s degree, and at least eight years of experience.

Develop and maintain full-stack web applications using React, .NET, and related technologies. Design front-end and back-end components, write scalable code, conduct testing, troubleshoot issues, participate in code reviews, and support the full software development lifecycle. Collaborate with cross-functional teams and clients while applying secure coding, architectural patterns, cloud services, and DevOps practices. The role also includes mentoring, technical communication, and contributing to continuous process improvement.

Design, deliver, and operate business-critical distributed systems for Signify Health’s value-based care technology platform. The role requires full-stack development, polyglot programming, scalable distributed-systems expertise, cloud engineering, SQL and relational database knowledge, and strong communication. Preferred experience includes event-driven architectures, AI-assisted development tools, Kafka, APIs, containers, Kubernetes, infrastructure as code, monitoring, CI/CD, and agile methods. Quarterly or as-needed travel is required.

Develop and deploy full-stack, geospatial software solutions for strategic defense and security customers. Own the full lifecycle from discovery through delivery, integrate cloud infrastructure and CI/CD pipelines, translate customer challenges into technical requirements, identify reusable platform patterns, and use AI tooling for rapid iteration. The role involves customer collaboration, mentoring, code reviews, and supporting critical commitments while working hybrid in Arlington, Virginia, and traveling 30–50% to regional customer sites.

Leads full-stack development, maintenance, troubleshooting, and implementation of a federal HR position classification application. Develops .NET APIs, integrates PeopleSoft and Oracle data, maintains authentication services, automated tests, documentation, and Azure DevOps pipelines. Builds AI-assisted applications using LLMs and related technologies while supporting production operations, root-cause analysis, and controlled releases.

Leads a distributed product engineering team, overseeing hiring, coaching, performance, delivery, quality, incident response, and production releases. The manager partners with Product, writes and ships code weekly using C# and .NET, reviews pull requests, and advances AI-assisted engineering practices. The role requires experience operating regulated systems, managing engineers across time zones, and building secure, reliable software for a healthcare-related SaaS platform.

Leads architecture, development, integration, and deployment of enterprise government IT applications. Defines requirements, designs scalable solutions, oversees SDLC and TFS workflows, documents architectures, evaluates emerging technologies, troubleshoots complex issues, and mentors technical teams. The role requires expertise in C#, Java, JavaScript, .NET, MVC, SQL, and JavaScript frameworks, along with government IT security knowledge, TS/SCI with polygraph clearance, and IAM Level I Security+ compliance.

Leads architecture, full-stack development, scalable application design, dashboards, backend integrations, AI-enabled features, cloud infrastructure, DevOps, monitoring, and production support. Mentors engineering teams, establishes technical standards, guides strategy, and develops solutions for payer operations, metadata, contracts, and performance measurement.

Designs and operates secure, scalable cloud infrastructure for AI/ML workloads in classified, multi-enclave environments. Responsibilities include optimizing cloud compute, storage, and networking; automating infrastructure through Terraform and DevSecOps; integrating public clouds with on-premises hyperconverged and GPU systems; managing Kubernetes-based platforms; supporting high-availability mission-critical applications; and implementing secure data and model governance. The role also establishes development standards and leads technical initiatives across teams.

Designs, builds, and maintains secure, scalable enterprise frontend applications. Develops reusable Angular UI components, integrates REST APIs and backend services, optimizes performance and accessibility, and supports cross-platform compatibility. Leads technical initiatives, establishes frontend and enterprise development standards, mentors developers, contributes to DevSecOps and CI/CD practices, and collaborates across teams on cloud-native, containerized applications involving ETL, data ingestion, and AI-enabled services.

Designs, builds, and maintains secure, scalable enterprise frontend applications and reusable UI components. Translates requirements into intuitive, accessible, high-performance interfaces; integrates frontend systems with backend APIs and data services; supports ETL and cloud-native application environments; and applies DevSecOps, automated testing, CI/CD, and secure coding practices. The role also mentors developers, establishes frontend standards, optimizes processes, and collaborates across teams.

Designs and operates secure, scalable cloud infrastructure for AI/ML workloads in classified, multi-enclave environments. Builds hybrid cloud and on-premises architectures, automates infrastructure with IaC and DevSecOps, manages Kubernetes and OpenShift platforms, integrates GPU and hyperconverged systems, and optimizes cloud networking, storage, databases, monitoring, security, and cost. Supports high-availability distributed training and inference applications while establishing technical standards and governance across teams.