Indian freelancers all banned from bidding on this project.
Less than 100 positive 10 star feedbacks from different sources, don't bid on this project, I won't consider you are qualified even though you are the best programmer in the world.
This module will be integrated to django site.
The message will be pushed to client when the message is ready on the server. the difference is it won't constantly check the message on the server, instead, it will wait for the incoming message. To do this. You will need to understand deep ajax technology and architecture.