Top C# Jobs in Washington, DC

Lead the design and development of secure, scalable payments platform services, including payment orchestration, fraud and risk capabilities, multi-provider integrations, bill payment products, and high-throughput backend systems. The role requires hands-on production coding, architectural leadership, mentoring, cross-functional collaboration, and advancing AI-enabled engineering workflows.

Lead large-scale software engineering efforts focused on modernizing monolithic systems into distributed, scalable architectures. Make major code design decisions, develop technical solutions, improve CI/CD tooling and TDD practices, and maintain reliable systems using C#, .NET, React, AWS, and Kubernetes. Mentor engineers, contribute to engineering standards, participate in agile delivery and code reviews, and collaborate with product, design, and international engineering teams.

Supports technical development and testing of Windows desktop operating system images for a U.S. Attorneys’ Office customer. Responsibilities include Windows 11 administration, Active Directory and Group Policy, enterprise imaging and deployment, Intune and Autopilot management, PowerShell automation, endpoint security, patching, vulnerability remediation, monitoring, hardware and driver lifecycle management, virtualization support, and troubleshooting complex desktop and application issues.

Design, build, test, and maintain tax-focused software solutions using Java, Python, C# and JavaScript. Apply ATDD and CI/CD, create APIs and microservices, perform code reviews and debugging, manage project delivery, and collaborate with cross-functional teams to improve business processes and client outcomes.

Design, build, and lead development of scalable, secure, high-performance cloud ingestion systems handling large throughput uploads. Provide technical leadership, system design, architecture reviews, mentorship, cross-team collaboration, roadmap management, and process improvements across multi-cloud infrastructure.

Develops and implements full-stack software solutions from concept through production using agile methods. Designs, modifies, and enhances applications; writes front-end and back-end code; solves complex technical and workflow problems; evaluates architecture and operating environments; collaborates with cross-functional teams; and identifies system improvements. The role requires DHS suitability and participation in a government investigation and skills assessment.

Owns automated testing across Angular front ends, APIs, GraphQL services, and end-to-end user journeys. Builds stable test architecture, manages test data and environments, integrates quality gates into CI/CD pipelines, and monitors coverage and suite health. Partners with developers on testable designs, performs exploratory and manual testing when appropriate, supports user acceptance testing, and coaches teams on maintaining reliable automated coverage.

Design, build, and support scalable full-stack software, backend services, databases, and cloud-native applications for investment risk and portfolio analytics. Contribute to architecture, technical decisions, automated testing, observability, CI/CD, data reliability, and technical debt reduction. Partner with engineering, product, business stakeholders, risk analysts, portfolio managers, and quants to deliver effective technology solutions.

Designs, develops, deploys, enhances, and supports enterprise client-server, web, cloud, and mobile applications using Microsoft technologies. Responsibilities include application fixes, production troubleshooting, monitoring, reporting and dashboard development, database integration, system upgrades, documentation, quality assurance collaboration, and technical advisory support. The role also mentors developers, coordinates programming activities, defines development standards, and collaborates with government clients and business analysts.

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.

Develops and maintains e-discovery software solutions using MVC.NET, C#, SQL Server, PowerShell, and related technologies. Responsibilities include requirements gathering, system and functional design, coding, testing, deployment, troubleshooting, documentation, process improvement, automation, and collaboration with government clients, end users, vendors, and IT personnel. The role supports high-volume electronic data management and analysis for a federal client.

Design, develop, and architect enterprise applications using Microsoft Power Platform, including Power Apps, Power Automate, Power Pages, and Dataverse. Integrate enterprise data sources, build custom plugins and APIs, implement secure architectures, and establish ALM and deployment practices. Lead and mentor a team of developers, collaborate with stakeholders and technical teams, participate in Agile ceremonies, and present technical solutions.

Lead design and implementation of modernized insurance underwriting and policy administration solutions. Drive cloud transformation, data-driven and secure architectures, improve risk selection and claims resolution, enhance customer experience through automation, mentor technical teams, manage client relationships, and oversee project lifecycle, budgets, and delivery quality.

Design, develop, and maintain ground control and mission-planning software for the X-BAT platform. Build full-stack, low-latency, fault-tolerant systems for telemetry fusion, operator UIs (React/TypeScript), communication interfaces, and integrations with autonomy and flight teams. Lead feature development, write well-tested code, and collaborate across embedded, UX, and flight-test teams to deliver field-ready solutions.

Build and enhance internal web applications, business tools, APIs, integrations, and Azure-hosted solutions. Support AI, automation, cloud migration, SQL, reporting, dashboards, and data initiatives. Troubleshoot issues, document systems, streamline processes, gather requirements, communicate with stakeholders, and own assigned work through completion. The role requires foundational software development knowledge, strong problem-solving skills, collaboration, adaptability, and a bachelor’s degree, with three or more years of related hands-on experience preferred or required by the posting.

Lead the architecture, development, and operation of enterprise-grade full-stack software for clinician-facing and performance-management experiences. Design distributed systems, drive technical initiatives, improve scalability and maintainability, adopt modern technologies, deliver iterative releases, and collaborate across organizations. Mentor engineers and establish strong engineering practices. The role requires polyglot programming, cloud platforms, modern front-end development, SQL, distributed systems, and production operations experience.

Build and evolve Unity’s PolySpatial core technology across low-level C++ and high-level C# systems. Design high-performance APIs for embedded, cross-process, and networked environments; manage execution timing and resource contention; and synchronize assets and components under bandwidth and latency constraints. Responsibilities include engine architecture, serialization, runtime performance, multithreading, networking, and end-to-end implementation and debugging.

Lead the design, development, testing, deployment, and maintenance of software applications. Collaborate with cross-functional teams, translate requirements into technical specifications, improve existing codebases, conduct peer reviews, and mentor junior developers. The role requires software development, programming, SQL databases, cloud services, CI/CD pipelines, DevOps practices, and Agile experience.

Designs, develops, tests, and maintains enterprise application services, APIs, business logic, data-access layers, and integrations. The role includes modernizing legacy systems, building automated tests, participating in CI/CD and code reviews, resolving production issues, and applying secure coding and observability practices. Engineers collaborate with product, cloud, quality, architecture, security, and client teams, with opportunities to lead complex services, establish technical patterns, mentor engineers, and influence modernization decisions.

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.

Own Ditto’s Rust SDK observability strategy and implementation across iOS, Android, desktop, and embedded platforms. Design telemetry, logging, tracing, support bundles, buffering, sampling, and export systems optimized for constrained devices and intermittent connectivity. Improve logging performance, maintain Rust SDK features, and support customers debugging production integrations. The role requires systems-level Rust, FFI, cross-platform SDK development, observability design, strong written communication, and customer empathy.

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.

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.

Develop and maintain C# and ASP.NET applications while migrating from .NET Framework 4.8 to modern .NET versions and transitioning databases from SQL Anywhere to SQL Server. Build REST APIs, optimize queries and stored procedures, troubleshoot application and database issues, support CI/CD deployments, and collaborate with analysts, QA, and stakeholders in an Agile environment.