Quarano is an open-source application for epidemic management developed by a team of engineers at a government-sponsored hackathon in Germany. The app helps health departments trace the spread of COVID-19, organize quarantines, and offer health services to citizens. Built on CockroachDB, Quarano ensures secure data storage with built-in encryption and scalability for future growth. Deutsche Telekom donated hardware for hosting the application in a highly secure environment within Germany. The app is currently being used by German Health Authorities but has potential for use beyond Germany due to its open-source nature and scalable infrastructure.