Our first in-house project was a platform for Minecraft Server Hosting. We developed an in-house management platform that intergrated an existing billing system, WHMCS, and combined it with server automation for deployments.
Our backend system was a custom PHP implementation with vanilla Javascript frontend. We ran it in-house until it was sold in 2014 to LocalNet. At the time of it's sale we were the largest Minecraft Server host in Canada.