iOS-Android and web development - modification to existing project

Hi, I have app for android and ios as well as website, for on demand sevices. I would like to add some functionality to the existing apps and web, where we need to add a module in taxi booking where we could allow different taxi companies to add their own fares, waiting charge and fleet simutanously. We do have functionality in the app but we want that global module to implement locally and individually where we can give permissions to other taxi businesses to join and have their own fares and policies. Once you will see the existing app, it will make easier for you to understand. I want someone who has proven record of developing on demand apps.