Hello,
We have read the job description and our team can develop a website with document storage feature.
We work with HTML, CSS, Bootstrap, Php, Javascript, Jquery, CMS Wordpress, Joomla, Opencart, Prestashop, etc. Have a look at our works - https://www.freelancer.com/u/Webln .
Could we discuss your project in detail,please? What payment gateways do you need?
With regards,
WebIn team.