freelancer for firebase firestore apps react streaming ssr freelancer for responsive landing pages fullstack dev mern stack developer react devtools ai assistant dotnet core development web design company web development services zustand react state library nextjs app development web development firm freelancer for langchain agent apps react 18 features https://softwaredevelopersreplace70245.ttblogs.com/16071402/the-2-minute-rule-for-cheapest-software-developers-in-the-world