Managerial Skills: Information Systems Management, Project Management, Information Systems Human Resources, Software Engineering Development Models (Waterfall, Spiral, Agile.... ), Information Systems Management and Maturity Models (COBIT, ITIL, ISO9000)
Operating Systems: Ubuntu, Debian, Freebsd, Windows, Unix, Linux
Programming Languages : python, php, bash, awk, C, C++ (Good), Delphi (Good), Assembly (Basic), java, javascript, .NET, perl, c#, asp, Pascal
Database: SQL, mysql, mariadb, mongodb, postgresql, oracle, sybase, interbase, paradox, bde.
Bigdata/Database: hadoop, hbase, hypertable, mongodb, percona, aerospike, claudera
Linux Servers/Programs: apache, nginx, php, hhvm, python, sendmail, postfix, dns-bind, ehcp, Radius servers, sybase, mongodb, ftpservers, kvm (vps), hosting management, hosting control panels