2.2.2. Multi-Account & Organizational Best Practices

Running everything in a single AWS account is like keeping all your money in one bank account with no spending controls — one mistake affects everything. Without proper account isolation, a misconfigured IAM policy in development can expose production data, and a runaway workload in staging can consume your organization's entire service quota. Multi-account architecture provides blast radius containment, billing separation, and security boundaries that single-account setups cannot achieve.

This section covers AWS Organizations, Control Tower, Service Control Policies, and account provisioning strategies for enterprise-scale environments. How do you balance governance control with developer autonomy across dozens or hundreds of accounts?