ECommerce Mobile app

We are trying to find an experienced UI/UX developer for designing an ecommerce mobile app. We are essentially looking for following two tasks: [login to view URL] the existing prototype for the app (This was built by another freelancer but we would like to make UI improvements on this. If we like your profile, I can share the Ionic View ID to look at the current app and also share the list of improvements that we would like to make. We own the source code of current prototype.) [login to view URL] the REST-API into the mobile app. (We have a separate developer who is writing REST API on the top of our ASP.NET based website. Those REST API will return the JSON data. We need someone to integrate those rest API in the app created as part of item # 1. Please note we are NOT looking for someone to write the REST API because we already have a team working on this. We are only looking for the integration piece) The app is expected to work on iOS and Android platform. Please let me know if you are interested and available to work on this. To make sure that it works out well between us, we would like someone to complete the first task initially and if we like the work, we would extend the contract for the second task.) Please give us a separate price for both of these tasks. We are looking for someone who has experience in ionic framework and Angular JS so share your previous work. thank you,