Top Remote 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.

Develop and deploy customer-focused web, mobile, and backend applications across the full software stack. Design major features, contribute to architecture decisions, conduct code reviews, and ensure secure, high-quality implementations. Collaborate with stakeholders and cross-functional teams using Agile and SDLC practices. Manage version control, CI/CD, environments, and releases; maintain automated test coverage and perform root-cause analysis. Build and optimize relational data solutions using SQL Server, including complex queries, stored procedures, and performance tuning.

Lead and mentor the software engineering team responsible for PSA Set Registry, a large-scale consumer web and mobile product. Drive architecture, development, delivery, code quality, release management, production troubleshooting, and technical strategy. Partner with product, design, and business teams to translate requirements into scalable solutions while promoting agile practices, collaboration, continuous learning, and an inclusive engineering culture.

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.

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.

Develop scalable C++ software that defines and enforces endpoint behavior across millions of managed Windows endpoints. Responsibilities include implementing features, improving platform performance, shipping production code, designing new systems, writing architecture documents, defining subsystem contracts, and collaborating with server, UI, product, and design teams. The role requires deep Windows systems and kernel-driver expertise, with preferred experience in WHQL, minifilter or WFP drivers, macOS Endpoint Security, and Linux kernel development.

Leads architecture and hands-on development of scalable backend systems and APIs supporting real-time applications. Owns the engineering lifecycle, writes high-performance code, establishes testing and reliability practices, resolves production issues, guides technical roadmaps, collaborates cross-functionally, and mentors engineers. The role requires expertise in object-oriented backend development, distributed cloud systems, automated testing, system monitoring, and technical leadership.

Volunteer Principal Full Stack Engineer to lead and contribute across frontend and backend (React/React Native, Node.js, MongoDB). Own feature development, mentor engineers, collaborate with product/design, ship scalable code, and support CI processes. Must commit 4+ hours weekly and attend a weekly standup; first task includes launching a fundraising campaign.

Volunteer senior developer to design, build, and maintain a cross-platform medical scheduling app (web, iOS, Android). Participate across the full development lifecycle: design, coding, testing, CI, deployments, code reviews, production support, incident management, and platform architecture. Attend weekly standups and commit at least four hours per week.

Develop and document enterprise-grade SaaS platform functionality while improving quality and performance. Responsibilities include full-stack development, functional and unit testing, defect triage, code reviews, API and process documentation, operational support in regulated environments, and collaboration within Agile and DevOps teams. The role requires expertise in C#, ASP.NET Core, T-SQL, Entity Framework Core, web technologies, software design, debugging, distributed architectures, and high-performance APIs.

Design, build, and maintain production-grade .NET web applications and APIs on Azure. Own full-stack delivery from data models and SQL to front-end components, CI/CD, testing, and architecture. Collaborate with product and delivery teams, participate in code reviews, and ensure secure, observable, well-tested services.

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.

Create and optimize high-quality, mobile-optimized character shaders and material workflows in Unity URP. Develop master materials, tools, and editor extensions (C#). Profile and debug performance on iOS/Android, collaborate with artists on look development, and ensure efficient rendering across mobile devices.

Design, develop, customize and maintain enterprise Sitecore solutions (versions 9/10, SXA, JSS, XM Cloud). Produce technical specs, implement components, test and debug in test and production, support teammates, perform demos to customers, and escalate/resolve issues.

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.

Design and build secure, high-performance Outlook Mobile features across email and calendar. Responsibilities include defining architecture, writing tested and instrumented code, improving reliability through telemetry and analytics, collaborating on APIs and technical solutions, and using customer feedback, experimentation, and AI-assisted tools to improve the product.

Designs and delivers scalable, resilient, cloud-native infrastructure services for Azure Virtual Machine Scale Sets. Responsibilities include gathering requirements, creating design documents, writing maintainable code, estimating work, monitoring services, responding to incidents, and improving availability, reliability, observability, efficiency, and performance at hyperscale.

Design, build, and maintain full-stack features across React/TypeScript frontend and C# backend. Develop APIs, optimize MySQL schemas/queries, implement caching, monitor on AWS, participate in code reviews, and collaborate with Product and Design to deliver reliable SaaS solutions.

Modernize legacy .NET and C# systems by reducing technical debt, refactoring monoliths into microservices, and re-platforming applications onto AWS cloud-native architectures. Build APIs, containerized services, infrastructure as code, and modern data migration workflows. Apply AI-assisted development tools for code analysis, refactoring, testing, and documentation while promoting simplicity, observability, scalability, and sound engineering standards.

Develop and maintain full-stack applications using .NET, C#, Angular, SQL Server, REST APIs, and Azure technologies. Build customer-facing and internal applications, automation tools, conversion solutions, and modernization initiatives. Participate in testing, code reviews, troubleshooting, production support, CI/CD, DevOps, and cloud initiatives while collaborating with stakeholders and mentoring junior engineers.

Leads architecture and development of Azure Storage table, metadata, and indexing systems at massive cloud scale. Designs distributed-system primitives for partitioning, indexing, transactions, consistency, replication, caching, and high-performance data access. Drives architectural decisions, prototypes innovations through production, and improves performance, scalability, reliability, and cost efficiency. Requires deep expertise in distributed storage, databases, or large-scale systems.

Develop scalable, automated software that improves product and platform security. Build and maintain full-stack applications, including front-end interfaces, application frameworks, data management, analytics, and visualization tools. Provide performance insights to customers and internal teams, research relevant technologies, and collaborate with multidisciplinary teams to deliver effective solutions.

Develop, deploy, and support enterprise UiPath RPA and intelligent automation solutions. Build attended and unattended bots, integrate APIs, SQL databases, enterprise applications, and cloud services, and incorporate Document Understanding, GenAI, LLMs, RAG, and agentic AI. Responsibilities include testing, troubleshooting, monitoring, production support, documentation, governance, security, compliance, and reusable component development.