Mobile app for thrift vendors

I am looking for a mobile app development company to develop an app that supports both iOS and Android users with flutter for the frontend and node.js backend. The app will allow thrift vendors to list, advertise, and sell their products online. Authentication for the app will be in the form of username/password, and the app will feature product view and purchase so users can easily browse and purchase the products they are interested in. If you have the expertise to develop such an app and would like to take on this project, I look forward to hearing from you!