Top .NET Developer Jobs in Seattle, WA

As a Senior Software Engineer at PerfectServe, you'll design, build, and maintain high-quality code for healthcare communication systems, mentoring junior engineers and collaborating across teams to improve patient care and clinical workflows.

The Senior .NET Software Engineer will drive development of .NET software products, focusing on back-end engineering, code reviews, and collaborating with cross-functional teams.

The role involves full-stack software development, adhering to Agile practices, and collaborating across teams. Responsibilities include coding, testing, and maintaining software systems while mentoring team members.

Develop and maintain ASP.NET web applications using HTML5, CSS3, JavaScript, jQuery and C#. Collaborate on UI/frontend implementation; contribute to application feature development and maintenance. Seattle-based permanent role requiring work authorization.

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.

Develop and maintain C#/.NET (or Java) applications, write SQL, and work with telemetry and big-data tools (Hadoop, Pig, Hive). Leverage Microsoft technologies to deliver enterprise IT solutions.

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 data-intensive, distributed middle-tier services and ETL pipelines using .NET/C#. Work across full development lifecycle: analysis, design, implementation, testing, monitoring. Optimize SQL Server performance and implement T-SQL/stored procedures. Collaborate in an agile environment to deliver scalable data acquisition, processing, storage, and distribution features.

Develop and maintain .NET applications using C#, ASP.NET MVC, ADO.NET, SQL Server, XML, REST and WCF. Write scripts (PowerShell, SQL), work with Azure, focus on architecture, system integration, performance and scale. Communicate effectively and adapt to new tools. 6-month contract.

Develop and maintain multi-tier .NET web applications; perform code reviews, mentor teammates, write automated unit tests, estimate effort, optimize performance, and deliver on Agile/TDD teams in a global delivery environment.

Develop and maintain full-stack .NET applications using C#, ASP.NET (MVC/MVVM), WCF, and SQL Server. Implement front-end features with AngularJS, jQuery, HTML5, CSS3, KnockoutJS and related UI technologies. Participate in code reviews, resolve technical issues, lead small teams, and work in a global delivery environment. Azure and CRM domain experience preferred; strong communication and analytical skills required.

Develop and maintain full-stack .NET applications using C#, ASP.NET, MVC/MVVM and SQL Server; build UI with AngularJS/jQuery/HTML5/CSS3; work on Azure and CRM projects; lead small teams, resolve technical issues, and collaborate with global stakeholders.

Design, develop, and maintain full-stack .NET applications using C#, ASP.NET, MVC/MVVM, WCF and SQL Server. Implement front-end features with jQuery/Angular/HTML5/CSS3/Knockout and Razor. Work on Azure deployments, resolve technical issues, and lead small development tasks. Collaborate across global stakeholders and communicate with team members; occasional travel may be required.

Full‑stack .NET developer responsible for building and maintaining C#/ASP.NET applications and front‑end UI (AngularJS, jQuery, HTML5/CSS3). Work includes MVC/MVVM patterns, WCF, SQL Server, Azure deployment, occasional team‑lead duties, CRM domain work, and collaborating in a global delivery environment. Good communication and analytical skills required; travel may be needed.

Develop and maintain .NET/C# applications using Visual Studio and Azure services. Perform production coding, work with Azure IaaS, Storage, SQL Azure and Azure SDKs. Support Data/Analytics/BI tasks using SQL Server, T-SQL, Power BI, Azure Data Warehouse and Azure Data Factory. Collaborate in a global delivery environment and demonstrate strong analytical skills and a willingness to learn.

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.

Develop, test, deploy, and maintain .NET-centric web applications using C#, Angular 17+, and Azure. Build and consume REST APIs, work with SQL Server, source control, CI/CD pipelines, and collaborate on code reviews, debugging, performance optimization, and third-party integrations.

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

Lead technical direction for a major product domain, reduce architectural debt, mentor engineers, standardize AI-agent workflows, and design scalable backend solutions integrating LLMs and cloud services. Drive cross-team RFCs, cookbook standards, and adopt agentic AI tooling while balancing security, quality, and delivery.

Design, develop, implement and support web applications using .NET Core. Collaborate with internal bank teams and external vendors, troubleshoot production issues, and apply strong interpersonal, leadership, and problem-solving skills.

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.

Design, develop, and maintain scalable ASP.NET/C# APIs and microservices and front-end interfaces (Vue.js, AngularJS) for retail omni-channel and POS platforms. Contribute to architecture, write production-quality code, troubleshoot issues, participate in code reviews, and collaborate with product, design, and QA to deliver features with minimal onboarding.

Designs, codes, tests, and documents .NET applications; follows SDLC and Agile/Scrum practices; supports Tier 3 incidents; works on system integration and CI/CD (Jenkins, GitHub); collaborates with product owners and vendors; participates in production releases and mentors junior developers.

Looking for an experienced .Net Full Stack Developer with over 10 years in Azure, PowerShell, ASP, and Angular for a contract role.