Fix the bugs

I have already built an app called FavorX using Base44\. It is a micro\-task marketplace that I plan to launch in Saudi Arabia\. I’m looking for an experienced developer to review the existing app, identify and fix bugs, test all features, and determine what is missing before launch\. The review should cover the user interface, maps, chat, notifications, payments, wallet, user profiles, task posting, and admin functions\. I also need recommendations on security, performance, and technical improvements\. My goal is to improve the existing app, not rebuild it from scratch\. Please provide an initial assessment, estimated cost, and timeline\.