PHP Developer to work in Custom CMS

We're looking for PHP programmers to work with an custom CMS project. We need to develop functions to extend the CMS. The CMS is easy to develop for, if you have experience in develop extensions for Magento, Wordpress, Joomla and similar, you will not have problem to perfom this task. PHP and Mysql knowledge its mandatory. Jquery and resposive design knowledge are welcome too. First, only send portfolio for website with some functionality custom developed, and please not more them 2 or 3 projects. Message with several links of projects like PSD to HTML, WILL BE IGNORED. We also understand that start to work in a new plataform take time of learning, but if