Woocommerce ionic ios and android app fix BUGS

Hi there! We had developed our app in ionic and we are facing some bugs and performance. We need to do this ASAP. Only bid if you are a super GURU and understand wordpress/woocommerce API and you are able to complete the project ASAP, 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. Make sure Payments work correctly 3. Make sure Sign in / Sign up work correctly 4. Make sure Shipping work correctly 5. Make sure Products fetch correctly 6. Product attributes in categories work correctly Don't bid if you are not familiar with wordpress/woocommerce api Thanks in advance!