> Markdown version of [/jobs/ext/4566338-react-js-developer-c-net-apis-seattle-wa-onsite-contract](https://www.wearedevelopers.com/jobs/ext/4566338-react-js-developer-c-net-apis-seattle-wa-onsite-contract). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# React.js Developer | C#/.NET APIs | Seattle, WA - Onsite | Contract

- **Company:** NextGen Staffing
- **Location:** Seattle, WA, United States
- **Experience:** Expert
- **Salary:** $104,000 - $108,160
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), .NET Framework, Application Programming Interfaces (APIs), HTML5, Automation of Tests, Microsoft Azure, C Sharp (Programming Language), Cascading Style Sheets (CSS), Cloud Computing, Databases, Continuous Integration, DevOps, Design of User Interfaces, Human-Computer Interaction, Microsoft Software, Routing, Responsive Web Design, Software Engineering, TypeScript, Web Applications, Web Application Frameworks, .NET Core, ReactJS, Backend, Git, Front End Software Development, Api Design, Restful APIs, Api Management, Serverless Computing, Key Vault, Microservices
- **Published:** November 4, 2026
- **Apply:** https://www.careerbuilder.com/job-details/react-js-developer-c-net-apis-seattle-wa-onsite-contract-seattle-wa--788eb7ab-b19e-4b33-a23e-fb7c7afb0ceb

## About the Role

Application Programming Interface (API), Microsoft .NET, Microsoft C# (C Sharp), React.js, Application Programming Interface (API), Microsoft .NET, Microsoft C# (C Sharp), React.js, Software Engineering, User Interface/Experience (UI/UX), * 5+ years of hands-on experience developing modern, scalable web applications.

 * Strong expertise in React.js, JavaScript, TypeScript, HTML5, and CSS3.
 * Strong hands-on experience developing backend REST APIs using C# and .NET / .NET Core.
 * Experience building reusable React components, hooks, state management, routing, and responsive user interfaces.
 * Strong experience integrating React applications with C# REST APIs and backend services.
 * Good understanding of API design, authentication/authorization, error handling, performance, and security best practices.
 * Hands-on experience with Microsoft Azure and deploying/supporting web applications and APIs in Azure.
 * Experience with Azure App Service, Azure Functions, API Management, Key Vault, or similar Azure services is preferred.
 * Familiarity with microservices, CI/CD, Git, automated testing, and cloud-native development.
 * Ability to troubleshoot issues across the React UI, C# API, database, and Azure layers and collaborate effectively with Product, QA, DevOps, and engineering teams.

## Description

We are looking for a strong hands-on React.js developer who is equally comfortable developing C#/.NET APIs, rather than a frontend developer who only consumes backend APIs.