12 yrs experience on Big Data (Fortune 500 Co.) and eCommerce sites (Magento, Prestashop, CS-cart, Woocommerce, OpenCart), WordPress, PHP, CSS, HTML, XML, JSON-LD, Speed optimization, Server Issues, Redirects, Mobile responsive sites, Analytics, Schema Markup, Push Notifications (Apple/Android/PC/Mac/Linux), Google Search Console Errors: Indexation, Sitemaps, Spam Backlinks, Speed, Structured Data, Layout errors, Fast Google Indexation of Backlinks, etc.