PHP/Javascript web developer for eBooks project (full time)

Dear free-lancers. We have rich javascript website based on PHP + MySQL + Javascript. We experienced with growing list of features required for website, as well as we have list of bugs required to be fixed. We are looking for developer with strong knowledge of following technologies to join our small team: 1. Javascript, AJAX, jQuery. This is rich javascript application based on jQuery and our own framework, so deep understanding of Javascript language is important. 2. PHP. Candidate must have experience with OOP. 3. MySQL. 4. Understanding of web applications security. 5. Ability to talk with us in English in Skype. 6. Knowledge of Sphinx will be a plus. We required developer for the full time basis (around 40 hours weekly). We can pay based on your hourly rate. A few weeks probation period are required for us to understand do we want to get candidate on full time basis. But if your results during probation period will not be good enough as we need - please understand that we forced to stop our future cooperation. Of course you will be paid for all time you worked for us. You need install our web project locally in order to start development. But please understand that we can't pay for this initial setup. We already have one task we want to start. We have books in many languages on out site, but we want also to add books in Arabic language. Difference that this is right-to-left language. So we need support these type of books too. You need review current code, and make changes, so books in right-to-left languages will be displayed correctly on our website. You are not required to know Arabic language. We can provide you person who can consult you does book looks good. You are responsible for the development part and communication with this Arabic person to make book looks good. Thanks Vitalii