Cloud computing : Amazon EC2 administration, VPC, autoscale, beanstalk, RDS and ELB, Server hardening , MySQL optimization and Magento boosting. Nagios monitoring, bash script and automated backup. Webserver tuning, Firewall installation and autoamted IP ban. Security tools: Various Intrusion Detection Systems (IDS) like Snort, Firewalls like IPtables,Secure networks/VPNs Also SSL, Digital signatures /certificates, Public/Private keys, PK Anything related to Linux