react server components freelancer for supabase postgres apps nextjs development company react automatic batching freelancer for cross-browser testing mern stack developer dotnet developer dotnet core development web design services freelancer for machine learning integration python web development react 18 features freelancer for netlify functions setup freelancer for fly.io deployment https://jungle-princess-pinball-m45578.look4blog.com/74366804/about-web-developer-online-courses-coursera