Nubank is the largest digital bank outside Asia, operating in Brazil, Mexico, and Colombia, and serving over 100 million customers. As a cloud-native company, our distributed digital environment relies on more than 4,000 microservices, generating nearly 1 petabyte of monitoring logs daily. To better manage this volume and reduce operational costs by over 50%, Nubank recently transitioned from an external vendor to an in-house log platform. In this talk, we'll share the platform architecture and the challenges encountered during the migration journey.