Modify billing system

I have gone through your requirements and would like to be considered to work on your projects. Having been in the Software Industry since a while, I have worked on websites previously for a variety of products. The technologies used for your projects will be PHP and MYSQL for the backend with HTML,CSS,jQuery and Bootstrap (to make the site responsive) serving as the frontend. Once the contract has been finalized, we’ll discuss timelines, further needs etc. I’m glad to answer any questions you may have! We have developed thousands of websites in many programming languages for clients all over the world. Please Send me a message so we are able to discuss a lot of regarding this project, please inbox me with more details about this project. Looking forward to work on this project. Modify billing system

Hola tengo un sistema de facturación e inventario que está funcionando perfectamente tal vez te sirva está echo con PHP, javascript, HTML, Ajax y Css con Mysql. Saludos