Android Chat Application with Plug-In Architecture

We need to develop the application in different phases as part of Agile methodologies. To develop highly scalable/extendable application, It should follow the best practices of Plug-In architecture. In the first phase of the application we should support the below features: I. Plug-In Architecture II. Authentication 1. Registration - (OTP with SMS) 2. Login 3. Reset Password III. Data Encryption IV. Multi Language Support V. User Management and Privileges VI. RESTful Web Services using Spring 1. User Authentication and Privilege Service 2. Chat/Message and Image Sharing Service VII. Application Release Management VIII. Chat/Message Plug-In IX. File/Image Sharing Plug-In In the above features all are non-functional requirements (Except Chat and File Sharing Plug-Ins) and can be re-usable in any application. So we should make sure that all the features are developed by keeping in mind for re-using/extending. So as part of this first phase we highly required excellent architectural design for scaling/enhancing the future changes in the next phases of the application. Based on the first phase deliveries we will proceed with next phases of the application. Check the below links if they are useful: [login to view URL] The complete details of each feature will be provided as part of documentation.