I need advice on how to rebuild a online management system plus CRM. I recently had a dev team build with pure php, a system for my company to allow sign up of many users (employees/agents) that will have own login and upload/access own profile, certification, licensing information. System also has basic CRM functionality for each agent to enter leads, clients and track them. Unfortunately, the UI was bad and flow was not functional - but the logic works. There is other features needed. I need advice on what "platform" or open source software to rebuild my system.