Hello,
Definitely i will add extension, having most experience in web design and development means PHP. I am ready to help you and can start immediately. 5+ years of experience. My expertise includes PHP, MySQL, Opencart, Shopify, CodeIgniter, wordpress, Responsive, jQuery, Bootstrap, JavaScript, Ajax, HTML5, DHTML, XML, JSON,SEO,CSS3.
Happy to hear from you.
Thanks,
Manish