freelancer for app refactoring and cleanup react automatic batching fullstack dev mern stack developer react devtools ai assistant react wasm integration freelancer for pixel perfect development freelancer for headless ecommerce sites freelancer for realtime dashboard web development agency freelancer for openai integration python web development freelancer for whisper api https://zanderysmdy.dbblog.net/12556524/not-known-facts-about-freelancer-for-cms-development