Collaboration on a Yii web application project

I need extra developers to work on an existing Yii web application project. The project is an HR management tool (user database, questionnaire, reports and more) The client has a deadline of the 30/04/2014 The tasks are not set so I need someone to work on an hourly basis and I will be giving day-by-day instructions and we will be working with Git and Bitbucket. The application is being currently developed with Yii, so good knowledge of this framework is essential. The project will then carry on during May and June developing other parts of it. So I would ideally like to work with someone who has time and resources to dedicate to this project-collaboration. I also have other projects based on Yii (this are of course separate projects) but it would be interesting to have a good work collaboration.