Android application from a website

Hi everyone! We are searching for the best android developer(s). The project is to develope an andrioid app from a website. The first step is to build a webservice because the app will use the same database (mysql) of the website. The website is built with Kohana and Mysql, it is a community where users can upload files and images (Like slideshare), so also it has a forum for differents topics. The app must have the following features (the most important features) : *The database contains tables for the features ( maybe one feature needs an aditional column in a table) * Login and register users. * A comment system. ( fast and optimized) * Files visor ( *pdf,*docx*xlsx*pptx) . ( Like scribd or slideshare APP) * Gallery. ( The app is based in images too, so the gallery must be efficient displaying and running fast). *Search with autocomplete ( fast and optimized) *Upload posts with images and without images. *Upload images ( from the gallery and camera, the upload process must be optimized and must have the feature to compress the size(kb) of the images with the highest quality). * News feed ( the app will have two news feed, the first for posts and the second to show the images and files). *A filter system for posts (It allows filter posts in the news feeds) ( it allows share posts with filter) ( the filter system will be explain later). *Notifications system. *Share button. *Save button. *Date of posts. I already have a front-end design in [login to view URL] Regards!