If you need to get something done - leave it to me.
OS: Linux - expert, FreeBSD and Windows Server - proficient
Cloud services: AWS
Web servers: Apache, Nginx, Tomcat
Database servers: Mysql, Postgresql
Atlassian: Jira, Confluence, Crowd, etc - the whole suite
Monitoring: Nagios, Groundwork, Zabbix, Monit, Munin, Cacti
Scripting: bash, sed, perl
Virtualization: Openvz, Vmware esxi/server, Proxmox
Mail servers: Zimbra, Exim, Sendmail, Dovecot
High availability: Corosync/Pacemaker, DRBD
Management automatization: Spacewalk, Puppet
Other: standard network services (DNS, DHCP, LDAP, Samba, SVN/Git, http proxy, jabber, VPN, backups, monitoring etc), firewalls and routers (iptables, iproute, VLAN, bridging, bonding).
Automation, optimization, troubleshooting, monitoring, backups - pretty much anything Unix-related. I can propose and setup high availability/high performance solutions for you.