Operating System / Server
• Windows Server 2003 / 2008 R2 (Terminal Services, TS Web Acces, RIS/WDS, WSUS, Hyper-V, Active Directory)
• Linux Ubuntu, RedHat, Centos  (Mysql, PostgresSQL, Apache, Proxy Squid, SVN, Samba4 AD)
• Mail Server (Iredmail, Zimbra)
• Storage Server(Nas4Free, Cloud Server, NFS, Gluster FS, iSCSI, Samba)
• Monitoring Tools (Nagvis, Ganglia, OCS Inventory)
• Application Server (Tomcat/JBOSS EAP)
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Virtualization
• VM-Ware (ESXi & VSphere, VM-Workstation, VDI, Converter)
• Proxmox (Clustering, Live migration, High Availability)
• RHEV (Clustering, Live migration, High Availability)
Database
• MySQL, DBA & PL-SQL (Store Procedure, View, Trigger, Automation Backup & Restore, Replication, Tuning)
• Microsoft SQL Server,  DBA & PL-SQL  (Store Procedure, View, Trigger,Automation Backup & Restore, Partition, Replication, Tuning)
Programming/Scripting
• Shell Scripting (Bash, Bat)
• Delphi 7, XE3, XE5 (Database, Network, Win API)
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Networking & Other
• Mikrotik (Firewall, Routing, VPN, Web Proxy)
• Microsoft Office,Windows Desktop,  HRIS (ProInt HRIS)