System admin to optimize/harden server + enable APC caching

I have a linux/centos server with WHM panel that I need fully optimized, including but not limited to enabling caching (APC) to optimize loading time for websites/gzip compression, as well as optimize mysql. You will also need to make sure all of my websites have enough resourced allocated to them and analyze server/mysql logs to remove any bottlenecks. You must have at least 5 years experience doing similar work. You must also be available via Skype.