In this AWS re:Invent 2023 session, Netflix engineers Prateek Sharma, Prudhviraj, and Sriram Rangarajan dive deep into EVCache, a critical tier 0 microservice that powers Netflix's global caching infrastructure. They explain the design and architecture of Cross-Region Replication (CRR), a large-scale distributed system that ensures data availability across AWS regions. The presentation covers the challenges of maintaining low latency and high availability for 240 million Netflix users, the implementation of EVCache using AWS services like SQS, Kafka, and EC2, and how they achieved a throughput of 30 million requests per second with P90 latencies under 2 seconds. The speakers also discuss efficiency improvements, observability practices, and future plans for the EVCache system. This session provides valuable insights into building resilient, globally distributed caching solutions at scale.