programming languages: Java, C, C ++, PHP, C#.NET, vb.NET, Python, Perl, Bash Shell, mq4, mq5, ninjascript.
Web servers / applications: Apache, Internet Information Server, Tomcat, Cocoon, WebSphere Application Server, JBoss, Red5.
Databases: PostgreSQL, MySQL, SQL Server, Oracle PL / SQL, SDE Spatial.
Operating Systems: Linux / Unix / Ms Windows / Android / iOS / Mac OS.