PHP DEVELOPEMENT BACK AND FRONT END

My last job in a registered company was as an IT support, becoming for more than 6 years the head of the IT department in charge of all the communications infrastructure, both local and remote, then I became a Freelance worker, the last project was a system Web invoicing for national company with technologies such as php, javascript, ajax, jquery, responsive designs with the boostrap framework of the latest version that would be 4, much of the project was done in mid and late 2017, the base manager of data that we used for the project was mysql with the phpmyadmin tool, the relationship between tables for the better management of the data of the system was verified and to be able to implement security mechanisms