App Builder

Hello! My name is Andrew Brunet and I am the CEO and Owner of Upgrade to see actual info, a software for amazon sellers in which they pay us a monthly fee for us to provide them with amazon product leads or information in which directs them to purchase profitable products. I am wanting to add other elements to this service like other areas for information and a professional app for each client to be able to sign in and view their paid information with a login and password. With that being said, I am looking for an experienced professional that can help me build and setup an app for my business as I want this to come out to be extremely professional and informative.