Expert knowledge and use of development / automation tools, application frameworks and testing / troubleshooting tools (some examples are Perl, Ruby, Python, Shell, BASH, traceroute, top, iostat, netstat, tcpdump, vmstat, ps, curl, etc). Expert system administration skills for operating systems (some examples are LINUX, UNIX, Windows, etc.) including Client / Server Application functionality, RBAC, SUDO, logging and health checks.