Nubank, a Brazilian financial technology company, is empowering customers with a 100% digital banking experience. Born in the cloud, Nubank does this by enabling its engineering teams to create scalable software that can quickly adapt to the changing needs of a complex market and by fostering a culture of microservices, container-based applications, observability, and immutability. In this talk, Nubank engineers Alexandre Cisneiros and Diogo Beato discuss why they treat infrastructure as a software engineering problem, and they address how AWS services, like AWS CloudFormation, Amazon EC2, and IAM, enable them to support millions of customers-transacting millions of daily purchases-without a dedicated infrastructure team.