I am in need of a programmer who can build a desktop messenger with below specifications:(to make this requirement simple, something very similar to yahoo messenger)
1. a desktop chat application with users groups, one to one chat, one to many(group) chat.
2. The application should have data security
3. it should be able to work without hanging even @ 20,000 user or above
4. the user interface and emoticons should be as simple as it should be with minimal colors.
It would be great if some one already have done a similar project and ready to customize it for me.