David Humphrey spearheaded a project that aimed to reboot Mozilla’s Thimble, a teaching tool for educators wanting to teach web technologies on the web. The journey from conception to completion is an interesting story, not because of the success of the project but because of how well it shows the advantages and pitfalls of using open-source technology as a base for a project. Join us as we explore the steps we took to launch a product that leveraged over two million lines of open-source code, and required less than ten thousand to be written in house.