Installation, administration, monitoring and maintenance of information system, system software, LAN, WAN and VPN, SAN computer networks
Maintenance of Windows AD and DC, DNS, LDAP, DHCP, DNS server, apache
Maintenance of mail server based on Postfix mail server and dovecot pop3/imap server
Installation and Maintenance of VMware vSphere virtual infrastructure (Debian, Ubuntu, Redhat, Centos Linux and Windows Server family)
Permanent consolidation and monitoring of server infrastructure and performance tuning, resolving performance issues on all server systems and subsystems; Maintenance of data storage systems, software, antivirus, backup, restore
Configuration, maintenance and backup of active network equipment (routers, switches, firewalls, gateway); Installation of new software/firmware
Monitoring, maintenance and administration of a security network system that includes a pfSense Firewall/VPN/Gateway/Antivirus package and proxy for Internet access and professional a..