Introduction Credential sprawl in multi-cloud environments represents a catastrophic security risk where static, long-lived access keys act as dormant vulnerabilities waiting to be exploited. When application cells operating in one cloud provider must securely access sensitive state stores or message queues in another, engineers often resort to hardcoded service account keys or insecure environment variables. This practice violates the core tenet of cellular isolation by creating a global identity that, if compromised, allows an attacker to traverse across cloud boundaries and pivot between independent cells. The definitive architectural solution involves leveraging OpenID Connect (OIDC) to establish a trust relationship between AWS and Azure. By implementing AWS IAM Roles Anywhere and Azure Workload Identity, you enable each cell to exchange its native identity token for short-lived, scoped credentials.…