Twitter Link Link Sniper

I need a programmer who will be able to code a program that, when running, will follow the @NikeStore twitter acct and automatically detect and open a product link when tweeted by the account and automatically select and add a specific size to cart. The program needs to run on Mac OSX. On certain dates, Nike will tweet a link at a certain time to one or more of its shoes for customers to purchase. I'd like the program to be able to click the link that was tweeted by Nike's Twitter account (as soon as it's tweeted, the speed of the program is most important), select a shoe size (user customizable), click "Add to Cart", and go to the "Checkout" screen automatically. The program must be able to perform these steps as quickly and efficiently as possible. To better understand how the program should work, please check out @Nikestore's Twitter account, click on one of the links, and analyze how their "add to cart"/checkout system works. The program, while running will need to complete the following 1). Follow a twitter account i.e @NikeStore official account. 2). Recognize a incoming tweet from @NikeStore with a twitter link to the product. (i.e. The LeBron X â??Homeâ?? is now available [login to view URL] ) 3). Automatically open the twitter link (i.e. [login to view URL] which directs the user to the [login to view URL] website where the sneaker is located) 4). Program needs to add a specific size (which must be editable) and quantity (needs to be editable also), and adds it to the cart, and then it automatically begins the checkout on the offical NikeStore link page. 5). Automatically pre-filled required billing (which must be editable) through the offical NikeStore checkout page. 6). Program must complete the check out process with shipping (which must be editable) and credit card information. 7.) Program must run in a loop until the checkout is completely successfull. 8.) Program must be very quick (instant) from tweeted link to checkout. If you have any questions, feel free to ask! Additionally, I need this program to work with Mac OS X.