Hi
I have 7 years of experience working with Joomla and most of it has been extension customisation. My previous freelancer account here (http://www.freelancer.com/u/KulendraJ.html) details most of it and my company now specialises in extension development ([login to view URL]) I have now set up as a company and slowly building up the account.
With regards to your requirement, I am confident I can get the requirement done. I do understand that since I don't have many reviews here, you have some risk. Hence there is no need to provide an initial milestone, you can complete the payment once you have seen the extension working as per your requirement.
I would be very grateful if you offer this project, as you know, starting up as a company is a bit difficult when you don't have many reviews. If you do have any queries, please let me know, I would be glad to answer them. I would also appreciate it very much if I can have a look at your site and the extension so I can confirm that I can do the job.
Thanks