Finalize Cross-Platform Base44 App

I have already coded the core of a Base44-powered app that lets everyday users sign in, encode or decode data, and move files up and down from the cloud. What I now need is a seasoned developer who can turn this proof-of-concept into a polished, production-ready release for iOS, Android, and the Web... (Budget: $250 - $750 AUD, Jobs: Android, Android App Development, Flutter, iOS Development, iPhone, Mobile App Development, PHP, React Native)