Hello
I will built PDF signing feature for our existing 'Contract Management' application with all your requirement.
I have 5+ years of experience with PHP, CI, HTML5, CSS, AJAX, JQUERY, WordPress, woo-commerce, Shopify, Wix, e-commerce, Magento, Mysql, React, Angular, Laravel, Graphic design, etc...
So I am sure, I can do that with high-quality work.
Thanks