Good evening! (ABC123)
My name is David Irving and I have been a professional developer for over fourteen years. I have worked for the past seven years as the lead developer for a company that exclusively builds web applications like the one you are asking for. As you can see, I have a very good reputation on this site and I also have a well established presence on [login to view URL] (viewable at [login to view URL]).
In regards to your project specifications, I know I can get this done for you quickly and professionally. I have written zip proximity plug-ins for WordPress so this should be a piece of cake. I'll need access to the database to do the work as well as admin access on Wordpress to install the final plug-in (if you'd like me to).
Please let me know if you have any further questions or concerns and I look forward to the possibility of working with you!
Thank you for your time,
David