This session from AWS re:Inforce 2023 explores data perimeter controls for managing trusted identities and resources. Tatyana Yatskevich from AWS introduces key concepts and security considerations for implementing data perimeters. USAA representatives Caleb McDonald and Tyler Warren then share how they've automated security baselines and empowered developers while strengthening their security posture through data perimeter controls. They discuss their journey to establish VPC endpoint policies for Amazon S3 as a starting point, including their risk-based approach, automation strategies, and lessons learned. The presenters provide valuable insights for organizations looking to implement scalable data perimeter controls to prevent unintended data access and exfiltration.