I say not a level III, because many mistake the level III tech with a system admin. Advanced knowledge of diagnostics does not make you a system admin, you have to have that knowledge to be one, but you also need a LOT more.
13 yrs of experience.
Worked for top level hosting companies.
Expert knowledge of *nix and cPanel.
Worked on everything from a webserver to shoutcast, torrent and voip systems as well as custom routing servers and mail servers.
I've designed the architecture for many companies, both in and out of hosting.