coding work on Volusion store

We're working on a new Volusion store and need a job done before it can go live. For some of the products we carry, we can only sell them to certain countries. When setting up our product categories, we need to be able to turn off the cats (and all of the products in that category) according to the country that the customer resides in (based on the country in the customer's account information, not their IP address). For instance, say we can't sell the products in category A to Spain. If a customer is logged in and tries to view that category or any of the products in it, they get a message that we can't sell those product to their country. If a customer is not logged in and adds a prohibited product to their shopping cart, when they do log in the product is removed from their cart and they receive a message letting them know why it's been removed. We're looking for a coder who is very experienced in working wtih Volusion shopping carts and can provide references of the work they've done. We're looking for a coder who works cleanly, performs best practices like backing up files before making changes, who comments and documents their work, and who communicates daily about what work has been completed and what remains to be done. When posting your bid, please give me an estimate of how long you think the job will take. Thanks!