Hello,
I found your "WP JSON API and User data to Mobile Apppost and i am very interested in your project. As a hard developper with experience developing many plugins in WordPress (plugin which communicates with an external API like infusionsoft or twitter and what you would want, integration of a payment plugin like nmi, paypal, skrill, considering about the hooks in wordpress, transients for handling cache, dropin plugin and nust-use plugin).
I would approach your project by starting connect myself in your website, via FTP, using PHPStorm8, dowloading your website on my web server to have a backup, and work on your projet in test mode. When there will be results, you will see them through the uri links that I will send you.
I think you will find i have the skills you are looking for.
Please, take a look at my portfolio to get an idea of the kind of website i have developped ; and the feedback i received from my previous employer. Typically, i work in oriented-object in PHP, CSS3, HTML5, and Boostrap. I am available now.
I would love to speak with you further about taking this project on.
Thank you for your consideration.
ADOUKO Franck
Full-Stack Developper.