GNU/Linux(CentOS - desirable) is your favourite Operating System and BASH is what you speak with a cup of coffee.
You think Programming as an art and have a good hold of it
Working knowledge of virtualization technologies like KVM, cloud computing (openstack - desirable) and storage technologies.
Expert in Networks, bridging, firewalls, DNS, VPN and debugging general problems
Experience with cloud computing systems like AWS, EC2.
Experience with infrastructure monitoring tools like nagios
Experience with source code management tools like GIT, SVN
Working knowledge of config management systems like puppet, chef and salt (desirable)
Experience with GNU/Linux package management system like deb, rpm (desirable)