This article discusses the benefits of using serverless technologies, particularly S3 and Lambda, for building software products in startups. The author shares their personal experience joining a startup called Courier, where they adopted serverless to accelerate development speed while scaling efficiently. They highlight how serverless frameworks like AWS Serverless Framework enabled them to build powerful send pipelines and automate tasks with minimal infrastructure management. Additionally, the article explores various use cases for S3, such as storing large item attributes in DynamoDB and using the Web Service to S3 pattern for managing time-consuming processing. The author also discusses a performance issue they encountered with a Lambda function and how reconfiguring it using serverless features resolved the problem. Finally, the article showcases an example of automating job processing with SQS and Lambda, demonstrating the potential of serverless to enable rapid development and deployment of complex systems. Overall, the article presents a compelling case for adopting serverless technologies in startups to achieve faster time-to-market and greater scalability.