Top Senior .NET Developer Jobs

Develop and maintain sports trading and tools applications and platforms using .NET, C#, and SQL Server. Build scalable, low-latency, highly available software handling high-volume real-time data. Support existing 24/7 trading systems, perform root-cause analysis, collaborate with product owners and testing teams, contribute to solution proposals and estimates, and mentor technical team members. The role will also expand into Golang, React, and Google Cloud Platform.

Leads end-to-end software engineering for healthcare payments systems within an agile team. Designs, develops, tests, reviews, debugs, and supports secure, scalable production applications using .NET/C#, SQL, and AI-assisted development tools. Drives automation, operational stability, responsible AI adoption, and software delivery practices. Partners with vendors and internal teams to evaluate architectures and technical solutions while coordinating cross-functional delivery.

Designs, develops, and maintains scalable distributed systems and full-stack applications using ReactJS and .NET or Java. Builds RESTful APIs and microservices, manages SQL and NoSQL data, and applies cloud, Docker, Kubernetes, and CI/CD practices. Collaborates with stakeholders and cross-functional teams, leads design reviews and code reviews, mentors junior engineers, documents systems, and supports critical applications through on-call rotations.

Develop and support .NET middleware, user interface, and web services applications. Integrate PostgreSQL databases, hardware devices, and vendor SDKs; create software design documentation; participate in Agile ceremonies; manage testing and defect resolution; and provide Tier 3/4 production engineering support.

Develop and support .NET middleware, user interface, and web services applications using C#, JavaScript, Vue.js, PostgreSQL, and AWS. Participate in Agile ceremonies, create software design documentation, integrate with hardware and vendor SDKs, manage testing and defect resolution, and provide Tier 3/4 production support. The role requires collaboration across projects and stakeholders and involves working two days per week onsite in Ashburn, Virginia.

Designs, develops, maintains, integrates, and optimizes enterprise-level .NET applications. Responsibilities include backend development, application architecture, technical documentation, deployment support, infrastructure assessment, troubleshooting, data integration, requirements definition, and ensuring scalable, reliable solutions. The role collaborates with developers, business analysts, project managers, and stakeholders to deliver and enhance IT systems.

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.

Build, test, deploy, and support production software using .NET/C#, React or Next.js, cloud platforms, databases, observability, and modern architecture patterns. Incorporate Claude Code, Gemini CLI, AI agents, MCP, and automation into structured engineering workflows while validating AI-generated output. Own delivery from planning through production, implement secure integrations and testing, document architectural decisions, troubleshoot systems, identify risks, and mentor engineers on responsible AI adoption.

Lead design and delivery of scalable full‑stack, cloud‑native applications. Drive architecture, AI‑assisted tooling, DevOps and observability practices, implement microservices/APIs, mentor engineers, and publish documentation and runbooks to ensure reliability and operational excellence.

Design, develop, test, and maintain enterprise applications using C#/.NET Core, microservices, REST APIs, and React.js. Build scalable integrations, write unit and integration tests, conduct code reviews, troubleshoot defects and production incidents, and support deployment and monitoring. Collaborate with architects, product owners, QA, DevOps, and global engineering teams to deliver maintainable production-ready features. Contribute to technical design, risk management, performance optimization, and continuous improvement.

Develop and maintain internal sales and manufacturing applications using C# and .NET. Implement new features, fix bugs, improve usability, simplify workflows, and ensure solutions meet business requirements. The engineer will work independently on medium to large projects, support existing in-house systems, and use SQL Server, Entity Framework, CI/CD tools, and deployment platforms. This is an on-site role.

Develop and modernize enterprise .NET applications using full-stack technologies. Conduct accessibility audits and remediate applications and reports to meet WCAG, ADA, and Section 508 standards. Refactor legacy C#/.NET systems, convert Crystal Reports and PDFs into accessible formats, and use NVDA, WAVE, Claude AI, and GitHub Copilot for testing and code remediation. Support DevOps pipelines, documentation, testing, and AI-assisted engineering practices.

Lead full-stack .NET development, legacy application modernization, accessibility auditing, and code remediation. Develop accessible web interfaces and PDF reports compliant with WCAG 2.1/2.2 AA, WAI-ARIA, and Section 508. Use C#, ASP.NET Core, JavaScript, Telerik, CSS, Crystal Reports, screen readers, automated scanning tools, and AI-assisted engineering tools. Configure CI/CD pipelines, manage Git workflows, and support testing and release engineering.

Develop and maintain applications using C#, ASP.NET MVC, .NET Core, SQL Server, JavaScript, jQuery, and HTML. The role requires strong database development, communication, documentation, and collaboration skills. Candidates must be local to Richmond, attend an onsite interview, and participate in occasional onsite meetings. Agile experience is preferred, along with familiarity with GitLab, DevSecOps, Azure Cloud, Microsoft 365, or Power Platform.

Design, develop, test, and support enterprise web applications using .NET technologies, modern JavaScript frameworks, and SQL Server. Build responsive user interfaces, maintain web services, optimize stored procedures and database functions, troubleshoot application issues, and collaborate on application design and testing. The role requires strong experience with Vue.js, ASP.NET, VB.NET, JavaScript, SQL Server, source control, and enterprise architecture.

Designs, develops, tests, deploys, and supports scalable software products and platform capabilities using C# and modern .NET. Builds APIs, backend services, frontend components, integrations, and AI-enabled application features in Azure. Owns capabilities through production support, modernization, monitoring, and continuous improvement. Contributes to architecture, code reviews, CI/CD, security, reliability, and technical planning while collaborating with global Product, Engineering, Architecture, Security, and Platform teams. Mentors engineers and supports maintainable, production-grade applications.

Lead development of secure, scalable digital banking software across front-end and backend systems. Design Angular or React applications, build APIs, optimize SQL performance, integrate third-party platforms, improve code quality, implement testing strategies, and mentor engineers. Collaborate with cross-functional teams in an Agile environment while supporting cloud-native practices, regulatory compliance, and continuous product improvement.

Build production C#/.NET services, REST APIs, and React/TypeScript applications for a high-volume payment risk platform. Own features through design, implementation, testing, code review, and Azure/Kubernetes deployment. Contribute to LangGraph-based agentic applications while developing Python and LLM engineering skills. Work with automated testing, CI/CD pipelines, cloud services, and AI-assisted development tools in a small, senior-focused engineering team.

Develops, deploys, tests, monitors, and maintains full-stack applications and enterprise systems. Resolves business and system issues, improves system performance, implements technology strategies, and ensures compliance with cybersecurity and risk-management practices. The role requires C#, .NET, JavaScript or TypeScript, SQL Server, SSIS, SSRS, Entity Framework Core, authentication, authorization, and software testing experience. It also provides technical guidance and training to junior engineers.

Develop and optimize Azure SQL and SQL Server databases, including queries, stored procedures, indexing, triggers, data warehousing, and ETL. Build and maintain AI agents using autonomous and multi-agent architectures, prompt engineering, and RAG pipelines. Support Azure App Services and C# .NET applications, troubleshoot performance issues, lead database projects, mentor junior developers, and document technical solutions.

Lead modernization of Georgia DECAL’s mission-critical licensing and eligibility platform from legacy ASP.NET to modern .NET and Azure architectures. Design APIs, cloud services, SQL Server solutions, React components, CI/CD pipelines, reporting integrations, and AI-enabled features. Own technical decisions, testing, deployment, documentation, production support, root-cause analysis, and code quality while collaborating in an Agile environment.

Design, develop, test, and support scalable web applications in a large enterprise environment. Build responsive user interfaces with Vue.js or other JavaScript frameworks, implement object-oriented enterprise architecture patterns, develop SQL Server procedures and functions, and troubleshoot application issues. Collaborate independently and in teams while creating use cases, process flow diagrams, and maintainable software solutions.

Develop and maintain .NET and C# web applications using MVC and IIS on Windows Server. Perform software testing, SQL stored procedure development, SDLC activities, defect tracking, technical documentation, and mentoring of junior personnel. Requires an active TS/SCI clearance with CI polygraph and eligibility for additional clearances.

Designs, develops, and maintains enterprise integrations for an Energy Trading and Risk Management platform. Builds REST and SOAP APIs, integration services, batch processes, messaging workflows, and event-driven interfaces using C# and .NET. Implements data transformations, validation, error handling, monitoring, reconciliation, and logging. Supports testing, troubleshooting, root-cause analysis, performance optimization, and deployment while collaborating with architects, ETRM teams, infrastructure groups, business analysts, and vendors.

Senior .NET Software Engineer responsible for end-to-end software development using Microsoft technologies. Requires extensive experience in SDLC, design principles, technical documentation, web application development with .NET, Agile/SCRUM, Entity Framework, database design, and version control. Familiarity with project tools JIRA, TEMPO, Bitbucket, and Confluence preferred.