web based OCR conversion

Looking for a programmer to write a web based OCR program that can be programmed to "see" certain areas of the document. These areas are to be converted into decimal (currency) to have math functions performed on them. For example reading several areas of an invoice and putting them into the appropriate fields of a web form. After inserted into the web form, there will be a calculate button that does basic math functions to the fields. Data should be saveable, preferably on the clients computer, not on a web-server. I do not want the responsibility of keeping financials for people or companies. Additionally, I would like to have the program wrapped in a website that allow customer accounts and management of them, potentially with e-commerce. Please let me know if you are interested and I will send you a spec sheet of everything the project will include. The budget below is just a guess, since i do not know how long it will take. same with the rate of pay. it is negotiable. Please feel free to bid the job at the amount that is fair, or give me some feedback.