Core PHP - Adding new features and cleanup of source code

Hi, our client has a ecommerce software which was developed by a Gurgaon based company. The copyright is owned by our client. We are looking for someone to Add new features and functionalities using PHP and Ajax Add a new top navigation menu - [login to view URL] Correct the functioning of some of the features. Clean up the code Document the code Speeden up the code Install new design Change category page layout You will need at least 4 years of experience on core PHP and Mysql Please send your bids along with sample of work done earlier and a brief explanation of your PHP skills. You have to sign a NDA. Payment will be only through freelancer.com. Need individual senior and experienced freelancers. Companies, please do not bid. Anna