full stack development nextjs seo optimization web programming hire full stack developer responsive web design dotnet core development freelancer for biometric time tracking jotai state management freelancer for openai integration web design and development modern web design freelancer for netlify functions setup flask development react native web progressive web https://software-developers-bls02325.blue-blogs.com/43948086/new-step-by-step-map-for-job-opening-for-web-developer-in-new-york