Planing, Installing, Maintaining Servers based on BSD, Linux, Windows acting as:
Cloud infrastructure - OpenVZ, BSD jails, KVM, XEN, vmware, etc.
Mail services - Postfix, qmail, dovecot, courier, sendmail, Exchange, etc.
Web services - apache2, php5, mysql, MSSQL, IIS, perl, etc.
Application services - IIS, MSSQL, Sharepoint, nagios, asterisk, squid, DNS, MySQL clusters and replication, LDAP, Windows AD, etc.
Networking - DNS, DHCP, firewalls(pf, iptables, access-lists, etc.) CISCO IOS, VPNs
Web and scripting - HTML, CSS, Perl, bash
Storages - iSCSI, glusterfs, zfs, samba, drbd, nfs, RAID, LVM
Failover, HA, load-balancing
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I do everything that can be done