Cabify wasn't happy with their infrastructure as they were struggling to meet their SLA guarantees. After a rough week with daily SLA drops and direct impact to customers, they decided to move forward with the migration of the entire underlying services infrastructure. The migration took Cabify barely 3 weeks, and they managed to do it without downtime or any customer impact. Coordinating dozens of teams and individuals, dealing and paying lots of technical debt in the process. This is the story of how they did it.