Rooms/Peer to peer instant chatting app (iOS & Android) using Parse.com

Looking for an experienced company/mobile developer to build an instant chatting app using [login to view URL] - Or if you've another solutions/suggestion for the backend infrastructure (XMPP, Pubnub etc..) we would love to hear from you. The app should include these main features: 1. Login/register by username and password or nickname (user could login through twitter, facebook) - Choose name, gender, country and photo. 2. Search, add and block people. 3. Multiple chat rooms where users can enter and chat with all other users, or pick a specific user/peer and chat with privately. 4. User should be able to send images only in private conversation. 5. We've a customized stickers to implement in the app which users will be able to send, Stickers will be delivered to you as JSON file which contains all the stickers links. 6. Admin can add, edit & delete rooms. 7. Admob ads (And probably will have also Facebook ads). 8. Users will get notifications when users send them a new message. These are the main features, More details and design will be delivered to the appropriate bidder. Supported Platforms 1. iPhone iOS 7 and above. (app should be optimized for iPhone 5, iPhone 6, and iPhone 6 Plus and iPad). 2. Android 2.3 and above The delivered result should contain: 1. Source code with nice layout and enough comments that is easy to maintain 2. A short document to describe your code and the structure We'll get an in-house QA to test the apps after finishing them completely. Please PM me with the following information when you bid: 1. A brief introduction about you 2. Technical details of instant chat/massing technologies you are familiar with 3. How much time you need to can complete the job. 4. Possibly how us a similar program you’ve done in the past.