Communication platform

Hi, I want to make a messaging program that is similar to slack.com. The UI needs to be built using [login to view URL] . The massager needs these features: -channels, private messages -edit sent message -push notification -everything encrypted -Admin center to control accounts - Admin can access all peoples message / login as them - admin can customize look for group. - show when people are online - good file uploader ( Drag & Drop, Select from Seafile, url) - be able to transfer files images, docs, etc -be about to use # and other references similar to slack. -profiles. - Good ui ( see mockup images ) -normal messaging features. - all message archive - In messages commands and references -Reminders - every users client gets all message and syncs better devices - presences shifting - Encryption on storage and sending - Server-side cache -active directory / ldap Server - past image in message box and send ( this is for attaching photo from clipboard) - read recipients - Mobile app for both ios and android with notifications - responsive design - in message commands and references - all docs have editing with etherpad - all files / storage in seafile - Channels should have 3 modes open, need approval, invisible invite only. - - Requires search box with open source index server to search all chats, channels and groups, emails, files , tasks etc. everything possible. - polls - integrate round cube or other opensource email client as seamless tab, unified design and same notification as messages style. (email, contacts, calendar) -Roudcube tags to message/channel - open source email server to host emails for each users. - allow configure to connect to external email server. -Homepage where admin create groups group.example.com. - loading page for [login to view URL] for members to sign up. - Send calendar invite in chat Additional Project Description: - In message Tasks management - Task dashboard - desktop notifications chrome/safari - supports plugins -write example plugin to base other off of. You can us any open source solution to solve any feature even if i didn't say and you can suggest alternatives to the ones i did mention. You cannot use any service’s once complete there should be no services needed to be paid. You can use open source software to meet any features. This is the first phase of the project, if you do well and deliver quality on first phase I will hire you to complete the next one. Please make sure you read everything before bidding. Only real messages will be responded to. NO generic proposals.