Hello!
I can upgrade PHP from 5.6 to PHP 7.
As for me, I lead a team of professional Web Developers, specializing LAMP (Linux, Apache, MySQL, PHP) + work with different open source solutions e.g. HTML5, CSS3, JavaScript, jQuery, CMS (Drupal, Joomla, WordPress), E-commerce solutions (Magento, OsCommerce).
I can work as a individual freelancer as well as with my own team.
I am available for discussion, feel free to contact me.
Regards!