We're looking for someone to help us scale our web server where we host demo sites for our premium WordPress themes.
We currently have six WordPress sites and a simple Symfony2 application on this server. We expect to add one WP site every one or two months. As the purpose of these websites is to demonstrate the capabilities of the themes, their contents are rarely updated after the first month. On average, each website gets about 500-1000 visits per day and our current setup of MPM-Prefork/mod_php/APC can't keep up with the load.
We'd like to replace the prefork/mod_php part of the stack with mpm-worker/php-fpm, although we're open to suggestions. We'd like you to do the initial setup, as well as help us develop our strategy for the future.