Hey,
I have reviewed your post and found that you're looking for a Website Developer to build a CRM for VoIP system and i understand that you'll provide the API's by yourself.
I have a team of Developers and Designers plus Digital Marketing and they are having a good hands-on experience in:-
PHP, HTML, CSS, Photoshop
Wordpress
Magento
Codeigniter
Shopify, Ecommerce, Python
SEO/SMO/SMM
Let's get connected for discussing more about the site development and designing precisely.
Thanks
Team Danin