There are indeed a number of off the shelf frameworks for the web platform and mobile apps. You should find a few by spending some time. First, identify a mainstream app that's close enough for your concepts like TaskRabbit or dolly or uber. When you are looking for it look for xxx clone script. Make sure the platform is available with source code. Many cases they can fit the platform to your requirement without starting from scratch. That would save around 80% of the development. It might be worth looking for a platform other than WordPress to create scalable platforms.