In this AWS Summit New York 2024 session, Venmo engineers discuss how they scaled their architecture to handle billions in payments for millions of users. They cover three key projects: migrating their social feed data to DynamoDB, implementing a transaction history stream, and moving to an event-driven architecture. The speakers explain how they distributed load, used event-based systems, and leveraged AWS services like DynamoDB, Kinesis, and Aurora to improve performance and reduce costs while maintaining data integrity and customer experience. This talk provides valuable insights for companies facing rapid growth and scaling challenges in financial services and beyond.