I'll develop a simple site for you with a text field where the code will be printed every time you scan it, and as soon as you scan it, it submits it to the database via AJAX.
Relevant Skills and Experience
I once did a very similar website. When a barcode got scanned and printed into the text field, it retrieved the price and name from the db via AJAX, without needing to reload the page or anything.
Proposed Milestones
$50 USD - Frontend setup
$99 USD - Backend functionality