* GIS – Mapinfo(MapInfo Professional, Mapbasic), ESRI(ArcView, ArcEditor), MapServer, TileServer, WMF, WFS, OGR, GDAL, OpenLayers, GeoExt, HeronJS
* Big Data – Hadoop, HDFS, MapReduce, Lucene, SOLR
* Workflow Programming – WWF, Activity
* GUI Development – QT C++, VC++ incl. MFC/WTL/ATL/STL, WPF,
Windows Forms, Visual Basic 5 & 6, Java (AWT, Swing)
* Web application – HTML5, Sencha, ExtJS, AngularJS, Prototype, jQuery, ASP, ASP.NET, JAVA(Spring, Struts, J2EE, JSP, EJB), PHP, CGI, Perl, Python
* Database design, development, administration & tuning – Oracle (PL/SQL), MSSQL Server(T-SQL), PostgreSQL, MySQL, FireBird, Sybase, IBM DB2, Sqlite
* Non SQL(MongoDB, Cassandra, HBase)
* MCU programming & firmware design – (ATMEL, AVR Studio, GCC)
* Mobile development (IPHONE, ANDROID)
* Network programming (Design and development of custom binary protocols, High load TCP server implementation)