Hello,
I have a lot of experience working with joomla, as a matter of fact, now I'm working on a custom extension for a real estate site.
I had worked building custom extensions for joomla from its 1.5 version to the latest.
I can do almost anything you want, joomla its pretty familiar to me.
Take a look at my portfolio there you'll find some of my pdrvious joomla projects.
Kind regards,