intergrating Vbulletin with wordpress LogIn

Currently we are looking for a developer that can integrate wordpress and vbulletin login. That is the only thing we need to be share. We have a wordpress plugin that deal with subscription and need that to work. We need both of the databases to talk to each other. Also if you sign in one place you are signed in at vb and vica versa. This needs to be working and we have a test board for the individual to do all the work.