In a nutshell
You'll need to have a strong understanding of PHP, preferably on Linux. We're not asking for X years of experience, but you'll need to show us you know exactly what you're doing as a PHP developer. If you're not already a ZCE, we'll get you there and many other places so long as you've got the right stuff.
Everyone here makes a real difference to the way we do things and the technology we produce.