Designing Cloud-Native Systems That Survive Region-Level Failures

Most teams design for instance and zone failures but treat region-level outages as someone else's problem. Region-level failures are rare — but they are not theoretical. AWS us-east-1 has had multiple significant incidents. Azure AD suffered a global authentication outage in 2023. Google Cloud's europe-west9 went offline due to a data center fire. When a region fails, the blast radius is not one service. It is every workload, every database, every queue, and every control plane operation scoped...