What does it mean for a big financial company to go large scale to the public cloud? What effect has this on the 200+ teams? What is needed to enable teams migrating their services from an on-premises modular monolith to a microservices architecture based on PCF, while ‘keeping the shop open’? We will share our lessons learned, how we enabled teams, how automation became our friend and what the costs are of full CI/CD. We will show what enables us to go from nothing to production within an hour.