Web app development

My company is QI Path (www.qipath.com), formed in 2011 and based in Boulder, CO. Our solutions are built around an enterprise SaaS app that is deployed globally, used to identify and mitigate clinical an operational risk in the healthcare and pharmaceutical development markets. We need help developing new feature sets and functionalities (including an API and a mobile app), enhancing existing features, and handling bugs as they come up. We need a full-stack developer with proven expertise and deep experience in Apache, PHP, MySQL, javascript, angular, jQuery, etc. Linux expertise also strongly preferred. We estimate workload will be 30-40 hrs/month for the next 4-6 months, and could extend after that. We're always developing, and want to develop a relationships with a developer(s) with whom we can build a strong, long-term relationship. Thanks! Tom