AWS multi-account architecture is a strategy of using multiple AWS accounts to isolate workloads, enforce security boundaries, and implement governance at scale using AWS Organizations.
A single AWS account creates a blast radius problem—a misconfiguration or security breach in one workload can affect everything. Multi-account architecture uses AWS Organizations to create separate accounts for different purposes: production, staging, security, logging, and shared services.
Tools like Atmos and Terraform make multi-account architecture manageable by defining account baselines as reusable components. Service Control Policies (SCPs) enforce guardrails across the organization, and AWS SSO provides centralized access management.
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