Top Senior .NET Developer Jobs in Seattle, WA

Develop and maintain scalable software solutions, mentor developers, and integrate AI tools. Collaborate on technical solutions aligned with business goals.

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.

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.

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.

Lead design and delivery of scalable, reliable software using C#/.NET, SQL Server, React, and Azure. Own complex initiatives from design through operations, mentor engineers, improve CI/CD, observability, and apply DDD/TDD/VSA practices. Use modern APIs, microservices or modular monoliths, and AI-assisted tooling to improve delivery.

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.

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.

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.

As a Sr. Software Engineer at Bloomerang, you will lead technical direction, mentor engineers, and enhance SaaS solutions while utilizing .NET and AI tools. You will ensure scalable, maintainable applications, advocate for Agile workflows, and focus on quality outcomes in software development.

Lead design, development, and implementation of full-stack applications using .NET and Angular. Collaborate with teams to gather requirements, ensure security, scalability, and performance on Azure, manage SQL Server databases, use Git for version control, and mentor engineering teammates while adopting best practices and emerging technologies.

Lead development of maintainable .NET applications within a small team, apply test-driven development, coach client teams on modern software practices, and continuously improve technical 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.

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

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.

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.