Debugging and fixing issues on Flutter Android app for ecommerce and customising and publishing its iOS version

I am looking for a professional web and app developer with extensive wordpress/woocommerce knowledge for debugging and fixing all issues on my Flutter Android app which is an ecommerce platform and to customise and publish its iOS version on appstore. You will also handle the website version because the apps are connected to website. Part of your work will to: 1. Customise and add extra ecommerce features on Android and make sure same features and layout are iOS too. 2. You may need to redesign the screens of the mobile app to make it look attractive 3. You will add all products categories from Admin Panel of the website and ensure they display on mobile apps. 4. You will optimise the website of the ecommerce and the Apps (Android & iOS) and ensure open and browse at lightning speed. 5. You will integrate Credit/Debit card payment gateway, that is a Virtual Account Number API will be provided for you to integrate on the web and apps to enable users to make cash deposit to our commerce platform for online purchases on the store and to withdraw cash back to their bank accounts if they wish. 6. You will debug and make sure all functions and features on website, android & ios are in perfecting working condition, including but not limited to referral program feature, shipping methods, wallet, payment gateways and all others. Note: The Android version is already publish and it's on Google Playstore but has Vendor Registration issue and so need to be fixed. Delivery Timeline: 5 days maximum. Budget: $200 USD.