WordPress expert to enhance a well known e-commerce theme - ongoing opportunity

We require various modifications for a well known WordPress e-commence, multisite theme created by an established developer. We require a WordPress expert to enhance the theme with the following:

• Various modifications to core theme to improve usability
• Integration with Facebook for login and user ratings
• Development of new store theme based on data from the existing theme
• WordPress security

This is an ongoing opportunity for the right person, to help develop over product into something amazing.