I'm very excited to play with opensource. I could develop system based on large open source project like Piwik and OpenX. It's take time for understanding a platform, but after that, I could do everything with it, include extending, writing plugin, customizing core or even rewrite it as my own way.
My favorite PHP framework is Yii because of fast and clean. I have spent one year to play around with Yii framework. My latest freelance project is about uniprogy framework (Based on Yii) with couponic and pinnect. I'm also comfortable with Zend, Drupal or Joomla.
Beside software developing, I could also deal with Linux system. Ubuntu is my favorite operating system. I could setup and maintain servers, whatever it running on debian, centos, Amazon EC2...
I could also working with linux shell script or python script to do daily task or background job processing on Linux server.
If you're interested in me, please /ping me.