Hello,
Given your job description, you want to use PHP scripts to connect the free version of Convert Forms (which I downloaded) to Community Builder username, password, email, and coupon code at signup.
I have been working with Joomla since version 1.5 came out. I have worked with Community Builder and JomSocial. Completing this project should take me less than a week.
Message me if you think we can work together.
Pedro Carbonell