freelancer for firebase firestore apps freelancer for supabase postgres apps front end developer react automatic batching nextjs seo optimization web design react devtools ai assistant react wasm integration freelancer for pixel perfect development freelancer for ai powered web apps jotai state management freelancer for langchain agent apps freelancer for https://trentonbccdk.tinyblogging.com/the-best-side-of-web-developer-part-time-80136382