Linux system administration
I've worked with Debian/Ubuntu and CentOS/RHEL as a solo administrator and as part of a team running some of the most heavily visited websites in the world including Creative Commons where I led the development of licensebuttons.net to improve the privacy and performance of the ubiquitous CC license graphics.
In my role at Adaptive Health, I oversaw the daily upkeep of more than 50 virtual and dedicated servers, plus a fleet of a dozen hardened Linux workstations, as well as leading five successful annual PCI compliant audits.