semantic markup

We are an industry leading marketing services firm currently working with a high profile client. We are looking for a contract Drupal Sr. Developer, who is strong in PHP, custom module development, RFDa, and multi-site configuration. We need someone close to the Bay Area, who can meet 4 times per month in person, during an approximately 4-6 month engagement. Knowledge of theme customization and integration of backend components with presentation layer is a plus, as the developer will be working closely with the front end developer.