• Linux administration (Postfix, Qmail, Sendmail, Dovecot, Apache, Nginx, Lighttpd, PHP, MySQL, iptables/ipwf, iproute2, DNS, FTP, DHCP, Samba, Squid, Subversion, Git, Redmine, Traffic Shaping) • Creation of virtualization based on VMWare ESXi, Proxmox, KVM, OpenVZ • Containarization and clusterization based on Docker, Docker Swarm • CI/CD based on GitLab CI, Jenkins • Monitoring of servers and network equipment based on Zabbix, Cacti, Nagios, Icinga and Munin • Administration of servers based on Windows 2000/2003/2008/2012 (MS Exchange, Active Directory, FTP, Terminal Server) • Set up backup and recovery (Bacula, Rsync, BackupPC, Dump, FSArchive, writing scripts in Perl and Bash) • Administration of the corporate system of electronic document management and collaboration IBM Lotus Domino (customer support IBM Lotus Notes) • Combining offices into a single network with the help of technology VPN (OpenVPN, PPTP, L2TP IPSec) • Create a call-center and administration of Asterisk