The problem
Leadership had committed to AWS as the primary cloud but lacked a repeatable landing zone. Workloads were expected across multiple continents and lifecycle stages—production, shared services, staging, UAT, and systems integration—yet there was no consistent account structure, no hub-and-spoke network model, and no automated way to provision VPCs and connectivity as new regions came online.
Engineering teams could not safely onboard until core security, logging, and network accounts existed alongside transit routing, DNS resolution, and on-premises VPN integration. Ad hoc builds would not scale; the platform needed to be codified and deployable org-wide.
Initial state
- No multi-account baseline — core security, logging, and network functions were not separated into dedicated accounts with org-wide guardrails
- Regional sprawl without a pattern — Americas, EMEA, and India workloads each needed isolated spokes, but no standard VPC or CIDR allocation model existed
- Connectivity gaps — on-premises and partner networks required site-to-site VPN with regional transit gateway routing; DNS resolution across internal zones had to work consistently in every region
- Manual provisioning risk — without StackSets and parameterized templates, every new environment would reintroduce drift and audit exposure
Our approach
- Multi-sovereignty, redundant-region cloud — architected a seven-region AWS foundation across the Americas, EMEA, and India with hub-and-spoke transit, Control Tower guardrails, and per-jurisdiction data residency and processing controls—so sovereignty requirements did not force separate, ad hoc cloud estates
- Control Tower customizations — extended AWS Control Tower with a manifest-driven deployment pipeline (CodePipeline, Step Functions, Lambda, and CloudFormation StackSets) for org-wide rollouts
- Core account topology — dedicated security, logging, network, and shared-services accounts with SSM Parameter Store exports so downstream stacks reference a single source of truth
- Multi-region transit hub — transit gateways in seven regions (EU West, EU Central, US East, US West, AP Southeast, AP Northeast, AP South) with route tables for infrastructure, edge, on-premises, and VPC attachment traffic
- Spoke VPC factory — parameterized VPC templates with integrated DNS for network, shared-services, and workload accounts across prod, shared-prod, stage, UAT, and SIT tiers
- Hybrid connectivity — site-to-site VPN, VPN NAT, and destination routing for on-premises integration; cross-account DNS resolver rules linking internal hosted zones to the network hub
- Infrastructure as code — version-controlled CloudFormation templates and per-spoke CIDR parameter files so geography and environment additions follow the same pipeline
Outcomes
- Enterprise landing zone operational — multi-account AWS organization with repeatable StackSet deployments instead of console-driven one-offs
- Global footprint ready — network and workload VPC patterns defined for Americas, EMEA, and India across production and non-production tiers
- Hybrid-ready platform — transit gateway routing, VPN integration, and centralized DNS resolver architecture supporting on-premises and cloud workloads
- Team self-service path — application teams could onboard to standardized spokes rather than negotiating bespoke network builds per project
“We needed AWS to behave like a platform, not a collection of accounts someone stood up by hand. Codifying Control Tower, networking, and DNS once—then deploying it everywhere—is what let us stop blocking product teams.”
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