Development and maintenance of website written in php

We are looking for someone who can work on a substantial site to carry out regular maintenance and development work on the site. This would involve everything from posting new content to developing existing ecommerce activity, creating new functionality and integrating third party whitelabeled functions to the site.

This work needs to be consistent with and further enhance the look and feel of the site. It needs to look good as well as work properly. The site is written in php.