Uber like Android App & Backed with customization from developers having fully tested ready app with source code

You must already have Uber like App & Backend fully working, well tested with source code. You may use such available code or can buy from third party developers but should have already used it in past and have complete knowledge of code. Open Source is welcome. You will be required to in this project: 1 - Setup a working demonstration of Uber like App system with its App & Backend with at least 80% of the working features. Demonstrate that you have source code and have ability to make various modifications 2 - Primary changes will be to - change certain workflow, change/add form fields, remove forms (say 20% of existing work flow) - Update UI with logos, text, images, color scheme - Publish it with our branding - Transaction logs/data be made available for additional back/sync Primary changes will not involve developing new modules or new logic. It will be limited to customization of existing developed business logic only. For additional module requirements you will be paid based on the man hour rates. For this project only quote for item 1 & 2 listed above along with existing app with source code. Please list details of your existing app with what technologies it use for UI, business logic, backend in detail. Also explain how well tested is the code and where all it has been used in the past. Any references or achievements.