E-Commerce Site Upgrade & Enhancements

Our LAMP-based online store has outgrown its original build and now needs a focused full-stack upgrade. The codebase sits on PHP, MySQL, Apache and Linux, so experience tweaking performance and adding functionality in this environment is essential... (Budget: $750 - $1500 USD, Jobs: Apache, eCommerce, Full Stack Development, HTML, Linux, MySQL, PHP, Website Design)