- CheckPoint administration (Nokia IP appliances (69x, 29x), SmartCenter, SmartConsole etc)- Linux administration(OS: Gentoo, Debian, Red Hat. Applications: iptables, apf, ddos, bfd, apache, asterisk, mysql, nagios, cacti, mrtg, php, rrdtools, proftpd, postix, dovecot, mailman, curys-sasl, shell scripting (bash, perl, php), bacula, openvpn, bind, mydns, zebra. Tasks: installation, configuration, support of the systems and applications, linux kernel optimization, linux OS optimization tasks).- Managed more then 400 servers on the Linux OS (Debian, Red Hat) for services like iBank (internet banking), corporative web site, corporative mail system (based on the postfix+mysql+cyrus-sasl)- CiscoCallManager installation (cluster, standalone etc), configuration and support.- Managed interior and exterior network routing using EIGRP, BGP - Support and securing mail system- Installed, secured and managed BIND, Apache, Postfix, MySQL, Squid, TACACS+, Jabberd, Bacula, Nagios, MRTG, NetFlows.- PHP,