Write some Software-Similar to Yammer or Slack

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
I would like to develop a online collaborative platform in Ruby on Rails. It must have a chat function, video conferencing ability, CMS/file sharing, and time manager (reminder & task). Similar companies are http://redbooth.com/ , https://www.unison.com/ , www.slack.com . I will not accept any person that does have this experience in their profile. Before I release any Milestone I must check the platform to ensure that it works. TYPE:5674 to let me know that you read this post.

1) Once project completed, developers need to assist me fully to deploy the application twice. One on the internet facing server and another on a server behind a corporate firewall for internal usage.

2) Developer is to assist me fully to integrate the sms gateway (hardware) on both deployment.

3) Developer need to specify what is needed before the project begin and any additional software or hardware required after the project begin will be developer's responsibilities.

4) setup the open source that i mentioned on your own server. why?
So that i know at least you know how to setup.
And we can based on what you have setup to discuss the details of the cloning and some of the customization required.

5) Please provide an estimated time line required to build yammer.com-like based on the open source provided. (exclude customisation required)

6) Please provide an estimated cost required to build yammer.com-like. (exclude customisation required)

Skills required:
MySQL, PHP, Ruby on Rails, Software Architecture, Software Testing
About the employer:
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