Need Mobile App Interface only like Login/Home/List/Detail Page

I am using AWS server to create database and creating APIs like getUserData, getCustomerList, createNewCustomer, createNewOrder, getOrderList, etc.

Need mobile app with Crisp design to call these APIs and user interaction.

My project is to design a mobile app interface that can be used with both iOS and Android platforms. I need a custom design and layout as well as existing themes to be incorporated into the design. What I am looking for is just a basic UI design with minimal complex functionality. I need the basic elements such as a username and password login page, home page, list page and detail page for the app to be created. With the combination of custom design and existing themes, I expect to receive a visually appealing UI for my mobile application.