Candidate should be passionate about writing code.

Commitment to the project, the team, and the company are critical to your success.
Excellent knowledge of PHP/MySQL database

Knowledge in Symfony or other MVC frameworks is an added advantage.  

Candidates should be comfortable with Linux, Subversion, Git and other tools that you require to be successful in your job.

Experience of object oriented programming / modular programming.

Experience of the full software development lifecycle: from requirements gathering and functional specification

Good communication skills