* Linux (RHEL, SuSe, Arch, Debian/Ubuntu, Slackware) & Free/OpenBSD * Automation: SaltStack, Ansible, Puppet (limited support of existing infrastructure) * Shell scripting (Python, bash/shell, Go, Perl, PHP, expect) * Basic experience in web development (PHP+postgresql/MySQL, python+flask/django+postgresql) * Network management, planning and research * Secure tunnels: Easy VPN, IPSEC, OpenVPN, SSL VPN * Dynamic routing protocols (BGP, OSPF) * RIPE accounts management * Databases management (PostgreSQL, MySQL, SQLite) * Virtualization technologies: VMWare, KVM, QEMU. Basic knowledge of jail, docker and LXC/LXD * Knowledge of different vendors of network equipment (Cisco, Juniper, Dell, DLink, Aruba etc) * Mail servers: Exim, Postfix, Cyrus, Dovecot, OpenBSDSpamd, SpamAssassin, Cisco IronPort * VoIP: Asterisk, Cisco CallManager * Managing ticket systems: Redmine, OTRS, Trac