Hi,
I am Odoo developer with 4 years of experience. I have been working for Odoo in different versions (from 7 to 13) on different modules (Sale, Purchase, Inventory, HR, MRP, CRM, POS...).
I read your requirement and understand your need: a bar code with 3 elements with some specific font, width, etc...
If you think the bid I placed is fair then you can hire me and create the milestone. Once hired I will proceed with the development.