Hi,
It could have better if you had posted link to your online application so I can view it and analyse it.
However I have worked number of times with php webservice using json.
I mainly work on Andoid Platform having experience of around 5 years. I do job in India and work as freelancer if I get free time and good project.
Can you please list of tasks which you want to apply ?
I am interested in this project, kindly reply me back if you are also interested.
Thanks and Regards.
Roshan.