GNU/Linux systems administration - Debian (more than 8 years), Ubuntu,
Redhat, Fedora Core, RHEL, CentOS (more than 5 years), Slackware
Solaris 9/10 on i386 and Sun hardware
Virtualization - Linux-Vserver.org, VMWare, XEN ,qemu, VirtualBOX, openvz
7+
years experience with network traffic control solutions - HTB, HFSC,
CBQ, WFQ/RED/WRED on GNU/Linux, FreeBSD and Cisco
Routing techniques and protocols: RIP,OSPF, BGP, ISIS, etc.
VPN technologies - IPSec, OpenVPN, l2tp, pptp
Web servers - apache, lighttpd, nginx, tux
FTP servers - proftpd, vsftpd, pureftpd
DNS - ISC Bind ver.8 and 9, hostmaster of 700+ domains, powerDNS
SQL - MySQL 3/4/5, PostgreSQL 7/8, Oracle 9, sleepycat db, SQLite
LDAP - OpenLDAP, ADS, Fedora DS
NMMS - Cacti, Nagios, Munin, JFFnms, OpenNMS, Smokeping, custom solutions
Mail servers (MTAs) - postfix, sendmail, courier-mta, exim
Mail servers (POP3/IMAP) - uw-imap, courier, cyrus, dovecot, dbmail
IM: jabber - maintainer of the first bulgarian jabber server ja