AngularJS Front End App

We need a freelancer to build out an Angular App with this features: - Web Chat in real time, groups and direct messages - Tasks / todo lists, with due times, calendar - Abble to upload files and share with other users in the chat group or tasks created - User are capable of block users, create private groups, invite others via email, share documents, full group administration. - Share their own documents in Dropbox, Google Drive and Box. App shoud be used by individuals and teams. Ouath2 integration with Facebook, Gmail and Linkedin. Public Api and Restful documentation. Full stack app with Node/Express/Mongo. Prefered with angular-material framework [login to view URL] so experience or understanding here would be preferable.