Custom made backend

I have a complete working Api and a MySQL database. I also have a style tamplate that I want my backend to use ( [login to view URL] ) I need an expert programmer to create a professionell Backend in clean "html5" using the api-library and the tamplate. All files must be clean and saparate. 1 - The api-library must ramain in it's own folder and untouched or changed. 2 - All additional php-script must be in a seperate folder. 3 - Only use external javascript and css files. 4 - Must work with my MySQL-Database. 5 - Secure and Robust If you are that programmer then we can discusse the functionality of the backend in detail. The price can be discussed.