If you are working with the same technology stack we work you will fix bugs and implement new features in your PAID time, not in your free time.
This is what we are looking for in your github profile. If you don't have it, may be you are fit for the work, but clearly you are not playing the same game yet.
I use Symfony at work. I would love to contribute some of the patches and helpers I have written to Symfony, or release them as an independent bundle, but (a) I'm the only programmer on the project so I don't really have time, and (b) my company doesn't really do OSS, so I would need to explain all this to our legal department before I could get authorization to release it.
This is what we are looking for in your github profile. If you don't have it, may be you are fit for the work, but clearly you are not playing the same game yet.