AWS Control Tower Multi-Account Architecture with Intelligent Governance
Healthcare Technology Organization
Overview
Designed and implemented an 18-account AWS multi-account architecture using Control Tower with centralized governance, automated account provisioning, AI-powered cost anomaly detection, and comprehensive security controls — including a centralized network inspection architecture using AWS Network Firewall.
Client Profile
The Challenge
Managing multiple business applications across isolated environments
Ensuring HIPAA compliance and healthcare data security
Enabling development, QA, and production segregation
Preparing for migration of on-premises workloads to AWS
Implementing centralized cost management with AI-powered anomaly detection
Establishing secure hybrid connectivity for gradual migration
Solution Architecture
Multi-Account Structure (18 accounts across 4 OUs):
Security OU (3 accounts): Log Archive, Audit, Security Services. Shared Services OU (3 accounts): Shared Services, Networking (Hub), Deployment. Production OU (6 accounts): Primary Prod & DR, Application A Prod, Application B Prod & DR, Legacy. Non-Production OU (6 accounts): Separate Dev/QA environments.
Centralized Network Inspection: Inspection VPC with AWS Network Firewall in multiple AZs — all inter-VPC and internet-bound traffic inspected through centralized firewall with stateful and stateless rule groups.
Intelligent Governance: AI-powered cost anomaly detection, automated budget alerts, and intelligent resource tagging recommendations.
Architecture Diagram — AWS Control Tower Multi-Account Architecture
Features & Capabilities
Multi-Account Governance
Centralized "Landing Zone" managing 18 accounts across 4 OUs
Centralized Network Inspection
Dedicated Inspection VPC filtering all traffic via AWS Network Firewall
AI-Powered Cost Anomaly Detection
Intelligent monitoring flagging unusual spending patterns across accounts
Hybrid Connectivity
Site-to-Site VPN + Transit Gateway for secure on-premises connection
Automated Account Provisioning
Account Factory creating accounts in hours vs. days
Identity Federation
SSO via Microsoft Entra ID integration with AWS IAM Identity Center
Disaster Recovery
Multi-region strategy with RPO/RTO targets and cross-region replication
Automated Operations
Golden AMI pipeline, centralized patch management, cross-account CI/CD
Technology Stack
Security & Compliance
All traffic routed through Inspection VPC with AWS Network Firewall
Least Privilege via SCPs; SSO via Microsoft Entra ID
KMS encryption at rest and in transit; production isolated from non-production
HIPAA, SOC 2, AWS Well-Architected Framework
Results & Impact
Account Provisioning
Reduced from days to hours
Security Posture
Centralized monitoring, automated threat detection
Cost Visibility
AI-powered anomaly detection across all accounts
Compliance
Audit-ready logging with enforced encryption/access
Scalability
Foundation for enterprise cloud migration
Monthly Baseline Cost
$1,070-$1,585/month (governance infrastructure)
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