This session from AWS re:Invent 2023 explores resilient architectures at scale through real-world examples from Amazon.com. Speakers Seth Eliot, Tulip Gupta, and Avinash Kolluri share insights on building highly available and scalable systems. They discuss strategies like cell-based architecture, chaos engineering, and multi-account observability used by Amazon teams. The presentation covers case studies from Amazon.com, Prime Video, Amazon Music, Ring, and Audible, demonstrating how these services achieve high resilience and scale. Key topics include fault isolation, auto-scaling, decoupled architectures, and the importance of metrics and observability across services. The speakers emphasize that resilience is a continuous process and provide actionable techniques applicable to applications of various scales.