Full stack developer: PHP Laravel & Codeigniter

We are looking for a freelancer to help us with backend development & support on a SaaS B2B web app platform. Minimum skill requirements: Degree in computer science, 5+ years working experience, PHP, Codeigniter, Laravel, MySql, working in team environment / GitHub. Primarily, the task is code fixes in large and complex environment. Excellent problem solving skills is a must. Freelancers only. Company submissions will not be considered. Must be U.S. based and please provide at least three references. Thank you.