User Interface
HTML5
CSS3
Jquery
ajax
Business Logic
oop php5.3
symfony2
codeigniter
twig
web services
objective-c (Iphone)
java(android)
ORM
Doctrine1
doctrine2
propel
Database Management
mysql
oracle
postgresql
Quality Assurance
black-box testing
stress testing
automation
Compatibility
iphone
ipad
android
blackberry
Internet explorer
firefox
chrome
safari