Hi,
I read your requirement carefully and can help you on your complex javascript app design & development, For more details discussion let me share your FTP & server details with me.
I assure you I will provide you best quality services at price $15-$18/hrs.
I have 7+ years experience in Web design & development with Wordpress, Drupal CMS using PHP solutions, bootstrap's, Java script, AngularJS, Node JS, CSS,CSS3, HTML, HTML5 etc.
We have done successfully over 260+ projects on UPWORKS with spending 15K hours.
Awaiting for your reply.
Thanks
Arvind