PHP / Yii framework / MySQL for e-commerce site

I need a PHP expert (you must be very very very very good with PHP/MySQL). I'd prefer if you are also familiar with Yii framework in PHP. Proficiency with other MVC frameworks like CodeIgniter and/or CakePHP is also a plus. I have purchased a script for e-commerce website. Similar to Groupon.com. The script DEMO and technical documentation is available at: <[login to view URL]> I need someone to make few modifications. Modifications like changing layout (I'd provide design in PSD), changing the change-location widget, adding some form fields, **adding some activation code process**, integrating new **payment-gateway**. Any PHP developer should be able to do it. There is technical documentation available, there is also technical help forum, and we can also email their technical-support team for help. They are very good. But you must be an **expert** already in PHP, and **Yii** framework. If you are not an expert, it'd take you many days to just understand and I am in a hurry so I need an expert. I can pay per hour or pay per project. Whatever is convenient. If you are interested, please reply back and let me know if you've any questions. **Also**, please include links to similar/technically complex PHP projects you have done before. Thanks,