Adding new features & fixing bugs of an existing web application

We have some web applications which we developed by using no frameworks or whatsoever. It's plain PHP. We need some new features to be added to the application, plus some bug fixes. We want to constantly add new features so this is a long-term job. The web apps use Mysql and some Jquery. Very straightforward, but dirty PHP codes. I can send some sample code which reveals the style of our code, so you can decide if you would like to work on it or not. We are PHP developers as well (as we developed the apps ourselves) and we want top quality code for our apps. The first week will be a test week for us. If we like the coder's work, we will keep it running on long-term basis. Thanks.