Implement new UI to current PHP App

Hello,

I am looking for a full-stack developer that can implement the following HTML Template to a current PHP application.
https://www.wrappixel.com/demos/admin-templates/flexy-bootstrap/flexy/src/main/index.html

Responsibilities
- Change the current look and feel of the PHP app and implement the design of the Flexy Template
- Current functionalities should remain as is
- Bug-free
- Tablet, Mobile responsive

PHP, HTML, CSS, Bootstrap, Javascript knowledge needed.