Need to develop an application which is an instant messenger (like viber, wechat, etc) and some add-ons and separate tabs to it. The application should be available on both Android and IOS. It should handle thousands of active users at a time without any errors or drawbacks. Further details of the project can be discussed if you are ready to handle the project. Budget of the project can be negotiated if you are a capable and can fulfil the requirements.