Deep knowledge and practical experience in OS Linux (Debian, Ubuntu, Centos, Fedora, Gentoo) and Unix FreeBSD family Experience in adjustment and usage of hosting applications Apache, Nginx, PHP, Perl, MySQL, FTP Deep knowledge and practical experience in using network technologies and protocols (Ethernet, LAN Switching, QoS, BGP, OSPF) Practical experience in working with network hardware: Cisco Systems, Juniper Networks, Extreme Network Deep knowledge in virtualization technologies: OpenVZ, XEN, KVM Experience in servers securing from DDOS attacks and working with high-loaded systems and network Practical experience in construction and using systems of monitoring and statistics gathering: Nagios, Cacti, Zabbix