Senior .NET + React Developer (Part-Time, Long-Term, US-Based Only — No Agencies)
We are a SaaS company in the Immigration Law industry beginning a full migration of our Azure-hosted .NET + Bootstrap platform to .NET + React. This is a part-time, long-term role for all of 2026. Strict Requirements (Must Meet ALL — No Exceptions) US-based freelancer only (no agencies, no international applicants). Top Rated / Top Rated Plus / Expert-Vetted ONLY. 4,000+ Upwork hours (not 2,000). 10+ years of professional programming experience. Must have prior, verifiable experience migrating software to .NET + React. You must include details of this experience in your application. Applications without this information will not be reviewed. Available Mon–Friday, 3–4 hours/day, with collaboration time between 9 AM–12 PM EST. Must use Upwork time tracker, Asana, and Slack for daily communication and task updates. Strong experience with: .NET (C#), Azure App Services, Azure SQL, Azure Functions React and modern component-based architecture Migrating legacy UI (Bootstrap/jQuery/.NET views) to React Azure AI services (preferred) If you do not meet all the requirements above, please do not apply. Role Overview Migrate an existing SaaS platform to a modern React + .NET architecture. Modernize UI/UX and refactor legacy modules. Enhance APIs, Azure Functions, and backend services to support the new front end. Work closely with our internal team across 2026. To Apply Your proposal must include: Confirmation you meet all requirements. Specific examples of prior .NET + React migration projects you personally led or contributed to. Your availability schedule for 2026. Applications missing any of the above will not be considered. Apply tot his job