Top Senior .NET Developer Jobs in Seattle, WA

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.

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.

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.

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.

Develop and maintain web-based applications using .NET/C#, JavaScript, HTML/CSS, SQL and Oracle/SQL Server. Perform root cause analysis, collaborate with teams for requirements, follow Agile SDLC, present change demonstrations, and use Azure DevOps/Jira for lifecycle management. Implement and maintain Blazor components.

Senior .NET Web App Developer responsible for designing and building .NET web applications, implementing Oracle PL/SQL solutions, using Entity Framework and Blazor, applying design principles, producing technical documentation, performing performance tuning, and collaborating in Scrum/Agile teams with Bitbucket, JIRA, Tempo, and Confluence.

Leads the design, development, and implementation of full-stack applications using C#, .NET, Angular, Azure, and SQL Server. Collaborates with cross-functional teams, ensures application security, performance, and scalability, applies Git-based version control practices, mentors developers, and stays current with emerging technologies.

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.

Build and maintain scalable, cloud-native APIs and high-value core system components using .NET and related technologies. Lead software architecture and testing discussions, enhance core offerings, collaborate cross-functionally, and ensure quality through code reviews, unit testing, functional testing, telemetry, and performance tuning. Mentor teammates and contribute to continuous technical and process improvement.

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.

Owns the design, development, testing, deployment, and maintenance of production software. Builds C#/.NET backend services, Angular web applications, and .NET MAUI mobile apps; optimizes SQL Server databases; resolves production issues; improves reliability, security, performance, and observability; writes tests and documentation; participates in code reviews; and translates ambiguous business needs into maintainable technical solutions.

Lead a development team while remaining hands-on in full-stack engineering. Design, build, test, deploy, and support secure web applications using C#/.NET, Angular, databases, and AWS. Drive cloud migrations, architecture, CI/CD automation, application security, troubleshooting, performance and cost optimization. Mentor developers, establish engineering standards, lead technical delivery, and collaborate with product, data, DevOps, and architecture teams.

Build scalable backend-heavy services and applications using C# and .NET, while contributing to Angular and TypeScript UI development. Design and develop REST APIs and microservices, work with relational databases, implement automated testing and CI/CD, and ensure system security, scalability, and performance. Preferred work includes event-driven architectures, messaging systems, NoSQL databases, caching, search technologies, and mentoring engineers or leading technical initiatives.

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

Develop and optimize customer facing web experiences, manage UX patterns, develop WebAPIs, mentor contributors, requiring 5+ years of web development experience.

This role requires a Dot Net Developer with over 5 years of experience in software development, particularly with C#, ASP.NET, MVC, and SQL. Knowledge in Azure is advantageous.

Seeking a .NET Developer with 5+ years of experience in C# and SQL to design and maintain applications using Microsoft technologies, focusing on Azure and system development methodologies.

We are looking for a .Net Developer with 5+ years of experience to build software on Microsoft's platforms, requiring great communication skills.

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.

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 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.