In this AWS re:Invent 2023 session, Jessica Deen and Nathan Peck, Principal Developer Advocates at AWS, discuss building multi-tenant SaaS applications on Amazon ECS and AWS Fargate. They explore four key aspects of customer trust: availability, security, agility in feature delivery, and long-term business viability. The speakers delve into strategies for isolating tenants, managing noisy neighbors, implementing security measures, and optimizing costs. They highlight the benefits of using AWS Fargate for reducing operational overhead and improving resource utilization. The presentation includes practical tips on leveraging AWS services like CloudWatch, IAM, and VPC for enhanced security and monitoring. Overall, the session provides valuable insights for developers and architects looking to build scalable, secure, and cost-effective SaaS solutions on AWS.