Building a page for a Shopify website

Hello, i would like to get a quotation on some work. I currently have a shopify website selling custom sneakers. I want you to make me a separate page on my shopify website where customers can take the serial numbers provided with their sneakers, enter it in to a field on the website which checks against a back end list of serial numbers which i can edit as i wish and then tells front end user if the sneaker is real or fake. I know its not a big job but i cant do it myself, can you quoute me on it? Thanks in advance.