ios and android app developed in ionic 3 fix bugs

Hi there! We had developed our app in ionic 3 and we are facing some bugs and performance, as well we need to add new features to the apps. We need to do this ASAP. Only bid if you are a super GURU on this kind of task and able to delivery soon, we will provide source code, stage server, what we need: Bugs and Performance: 1. When we make a product Search or look by category the app shut down the database or put our production server down. Also we need optimized the app performance. 2. Fix payments Payments - Credit card payeezy - Fondo disponible - Fix bugs with cash on delivery (delete the url of product image) on email order details - Make sure our COP currency is converted to USD to be supported by paypal and credit card gateways Note: make sure all our payments methods work fine on ios and android, currently the payment provide errors but transaction goes through. 3. Sign in / Sign up - Make sure old customers can sign in (this is not working properly on iOS) - Make sure new customers can sign up Note: make sure flow work on ios and android 4. Shipping - Make sure shipping rules in woocommerce display same as our website - Display all the countries we have setup to receive orders (currently only 1 country is showing) 5. Products - Variable products pricing and data is taking time to fetch the data 6. Product attibutes in categories - The app is showing inside the categories all the attributes, it should only display the attributes that belong to the products that are inside that specific category. Custom (features we need to add to the current code) 1. Delivery calendar and zip code - Add delivery calendar options. - Add zip code options Note: we will walk out through this to clarify. 2. Rewards points - Make sure the app show the rewards points to earn on checkout page Note: we will walk out through this to clarify. 3. Seller commission - Make sure after the order is placed the app split the commission for vendor products and store After you complete the points listed above you will need to provide: 1. ipa and apk to install and our devices and test 2. Once test pass without bugs and is approved by us, you will provide the source code with the updates 3. Submit to apple and google store More details we will discuss on chat. Thanks in advance!