Raffles, voting systems, and major product launch events cause unpredictably high traffic and require highly scalable and robust architectures. Serverless architectures have made it easier to build scalable applications, but they do not scale limitlessly automatically. This talk will walk you through limits, core principles, tradeoffs, and best practices for serverless workloads that can meet virtually any demand. We will design a raffle service and demonstrate its scalability to over 1 million users within minutes.