I make this:
-Mobile POS for Minimarket, restaurant, shop, parking, and hotel.
-Mobile POS plus online tax reporting.
-Online Currency Converter apps -->Integrated with yahoo finance
-Device Tracking apps.
-Web Browser apps
C/C++ in EDC Programming
-PPOB App
-EDC App for Indonesian Banks (ISO8583 handling)
-Electronic Voucher Distribution App for loyalty member
Webservice
-Python Based
-Phalcon PHP Framework
-CI
Web dashboard
-Device Monitoring and reporting
Database used:
-MySql
-Sqlite