I have worked with various Unix operating systems over the past 17 years and have achieved certification in Sun Solaris, Cisco, VMware, Red Hat and Novell.
I spend most of my time now working with Red Hat Linux (and derivatives) and have recently completed all necessary components of the Red Hat Certified Architect qualification; the highest certification available from Enterprise Linux provider Red Hat ([login to view URL]).
For those that are unaware, Red Hat is the enterprise level of the both CentOS and Fedora - so you may well see me bidding on your projects even if you havent specified Red Hat Enterprise Linux ;-)
Confirmation of my Red Hat certification can be found at the following URL
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I am based in the UK but am available between 8am and 10pm most days including weekends.