Top Senior .NET Developer Jobs in Seattle, WA

Senior full-stack .NET developer responsible for requirement analysis, design, coding, testing and production releases. Build secure, modular front-end (JS/HTML/CSS), middle-tier services (C#, Node.js), and persistent layers (SQL/NoSQL). Participate in code reviews, apply SOLID/OOP and security best practices, and support cloud migration and high-availability web applications.

Senior .NET Developer to build the ORCA compliance system. Develop ASP.NET/C# web applications, AngularJS front-ends, RESTful Web APIs, cloud services (AWS/Pivotal), MongoDB and SQL Server-backed distributed systems.

Senior .NET developer to design and build new front- and back-end components using C#, ASP.NET (MVP), SQL Server and web services. Work on healthcare/payer front-office features, producing greenfield code and integrating benefit data into broader systems. Contract role with potential for contract-to-hire.

Senior full-stack developer responsible for end-to-end web development using ASP.NET and AngularJS. Must write strong C# code, solve complex problems, and deliver E2E web solutions.

Develop and maintain full-stack .NET web applications in the telecom domain. Responsibilities include prototyping, implementation, deployment, integration with QA/production, database development with SQL Server/T-SQL, use of frontend frameworks (jQuery/AngularJS/Node.js), source control, SDLC/ALM practices, and WF/WCF development.

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 full‑stack developer responsible for designing and building backend APIs in C# (.NET Core/.NET 8) and Angular 8+ frontends. Implement unit testing, CI/CD (YAML) in Azure/Azure DevOps and GitHub, use Docker/Kubernetes, integrate CMS and third‑party systems, ensure code quality (SonarQube, test automation), and troubleshoot production issues.

Lead C# .NET Backend Developer to architect, build, and maintain scalable microservices and RESTful APIs using .NET Core. Drive CI/CD, containerization (Docker), Kubernetes orchestration, and Azure deployments. Mentor developers, ensure code quality and security, collaborate with QA and product teams, and champion agile practices.

Seeking a Senior Full Stack .NET Developer to work on a social good project, with strong skills in C#, AngularJS, design, and UX. Requires 5+ years of experience.

The Staff Engineer will leverage 5+ years of experience in C#, JavaScript, and frameworks to lead and innovate solutions in a collaborative environment.

The Senior Backend .Net Developer will design and develop large-scale web services and APIs, ensuring high-quality code and utilizing Azure PaaS services, while adhering to Agile practices.

Responsible for programming and debugging in C# and .NET, developing web services, and working with database systems. Requires strong communication and problem-solving skills.

The .Net Developer will work on front-end heavy projects using ASP.NET, C#, JavaScript, and jQuery, requiring strong communication and independent work skills.

Develop and debug applications using C# and .NET. Design SOAP and RESTful web services, and work with SQL databases. Requires strong communication and problem-solving skills.

Seeking a Senior Lead/.NET Fullstack Developer to create scalable enterprise applications, focusing on exceptional user experiences and strong problem-solving skills.

Senior .NET full-stack developer responsible for custom application development, API integrations, database optimization, deployments, troubleshooting, performance, security, and production support using .NET/C#, ASP.NET Core, SQL, modern frontend frameworks, cloud, and CI/CD.

Provide technical leadership to design, modernize, and sustain a portfolio of .NET web applications and Azure infrastructure. Develop and migrate WebForms to ASP.NET Core and SSRS to Power BI, maintain SQL Server databases, enforce secure coding and ATO compliance, ensure accessibility (Section 508/WCAG), and mentor junior developers while coordinating with VA stakeholders.

Design, build, and maintain scalable web applications for payroll and accounting. Collaborate with engineers and product partners, write tested code, participate in code reviews, contribute to architecture, improve CI/CD and monitoring, support production (including on-call), and communicate progress while continuously learning.

Design, develop, test, and deploy .NET solutions (APIs and web apps). Build and consume RESTful services, work with SQL and NoSQL databases, use cloud (Azure/AWS) and Docker, apply unit/integration/performance testing, participate in code reviews, define features via spikes, and architect scalable, high-performance systems. Support occasional after-hours and on-call rotation.

The role involves providing technical solutions, guiding teams, ensuring compliance with standards, and leading application design and development in .NET and SQL Server environments.

Develop and implement full-stack applications in .NET and Azure, collaborate with teams, provide technical guidance, and ensure high-quality standards.

The Senior .NET Developer will design, develop, and support REST APIs at scale, working with C# and the .NET Framework while collaborating with cross-functional teams.

The Sr. .Net Developer / Architect will design, develop, and support REST APIs and distributed systems, with a focus on C# and .Net technologies, and work with cloud platforms like Azure or AWS.

Seeking a Sr. .Net Developer experienced in C#, SQL, SDL Web, Tridion, Azure, and enterprise asset management for a 6-month project.

The role involves enhancing, developing, and maintaining .NET applications for over 6 years. Communication skills are essential.