Write an Android app

On top of our existing Android App, we need an additional independent feature : "Expert Chat" by 3rd party chat integration with QuickBlox or Pusher, as a bugfree feature by 07th Mar 2017. Please note that it includes Payment Gateway integrations - PayPal (international users) and PayTm (Indian users). PFA the screen designs, inspired from a reference app. Technically, it has to be done on top of the existing App (Android - Java Spring for Service Layer - MySQL - hosted on Ubuntu Server in Amazon EC2 cloud), as additional feature with associated WebServices in Java Spring and FrontEnd pages in Android. The codebase is expected to be maintained online over GitHub and the project will be defined as complete only when there are no functional/cosmetic bugs. The expected performance can be 3secs for each new page to load and it can go upto 5 secs max in some exceptional cases. The expected budget is 7,000 to 12,000 and the delivery dates are as follows: Milestone-1: Quickblox Integration : 7th Mar 2017 Tue. 10pm IST Milestone-2: PayPal & PayTm Integration : 9th Mar 2017 Tue. 10pm IST Whoever is selected is vendor is expected to be value-driven and maintain the confidentiality of the project and codebase. Thanks !!