Bunsan has been a software company running 100% remotely since foundation three years ago. We care about continuous learning and find out that remote working platforms and collaboration tools won't cover those needs, cause they are too broad or too specific. So we have built Tich: a virtual classroom with a real-time whiteboard, screen sharing, and video calls. We want to share you the significant challenges and how we use amazing technologies like Elixir, Phoenix, Janus WebRTC, and Apple Pencil to create Tich.