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Cloud Architecture AWS Architecture 18 weeks

Multi-Account Landing Zone and EKS Platform Deployment

Designed and deployed an AWS foundation for a growing engineering organization that needed stronger environment separation, clearer security boundaries, and a production-ready container platform.

AWSAWS OrganizationsService Control PoliciesAWS ConfigCloudTrailEKSTerraformGitHub ActionsArgo CDIAMVPCcert-managerExternalDNSExternal Secrets Operatortflinttfseckubeconform
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Architecture Diagram

AWS MULTI-ACCOUNT LANDING ZONE + EKS PLATFORM — ARCHITECTURE OVERVIEW FOUNDATION AS CODE Terraform Modules AWS-native landing zone + platform codified Validation Gates tflint · tfsec · plan review GitHub Actions OIDC CI auth into AWS without long-lived keys Outcome repeatable account and platform rollout safe promotion of infra changes AWS ACCOUNT STRUCTURE Security Account CloudTrail + audit baseline AWS Config rules guardrail IAM roles Shared Services DNS / common services cross-account access patterns shared platform dependencies Workload Account segmented VPC private subnets + NAT VPC endpoints AWS Organizations + Service Control Policies enforce the account boundary model EKS Platform in Workload Account Managed Node Groups cluster compute worker capacity IRSA pod-to-AWS access without static secrets Platform Add-ons ALB Controller ExternalDNS · cert-manager External Secrets Operator DELIVERY PATH GitHub Actions build + infra / app pipeline Argo CD GitOps sync into EKS Validation kubeconform · helm lint · smoke tests Operational Outcome clear workload onboarding path platform services built into the baseline

Purpose

The client was growing beyond a single-team AWS setup and needed an operating model that could support multiple environments and teams without re-deciding account structure, IAM boundaries, network patterns, audit controls, and Kubernetes delivery mechanics for each new workload. The project solved that by turning AWS-native multi-account capabilities into a coherent landing zone and EKS platform baseline that teams could onboard to repeatedly.

Technical Implementation

  • Built the landing zone around AWS Organizations-style account separation for workloads, shared services, and security, using Terraform modules for account bootstrap, guardrail IAM roles, CloudTrail, AWS Config-backed control patterns, and baseline networking so additional environments could be added without redesigning the foundation.
  • Defined the network model with segmented VPCs, private subnets, NAT routing, VPC endpoints, and cross-account access patterns, then validated Terraform changes with tflint, tfsec, and plan reviews before promotion.
  • Deployed EKS with managed node groups, IRSA, the AWS Load Balancer Controller, ExternalDNS, cert-manager, and External Secrets Operator so ingress, TLS, DNS, and secret injection were handled as part of the platform rather than per application.
  • Connected GitHub Actions pipelines to AWS through OIDC and used Argo CD to deploy workloads from Git, which made the deployment path reproducible and allowed platform validation through kubeconform, helm lint, and smoke tests on the first onboarded services.

Client Delivery & Handover

The project was implemented with the client architects and platform engineers through architecture reviews, paired Terraform work, cluster bootstrap sessions, and rollout checkpoints as environments were promoted. Handover included landing-zone diagrams, module guidance, EKS runbooks, deployment workflow documentation, and enablement sessions on platform operations, account administration, and workload onboarding. The goal was to leave the client team with both the working platform and the operating knowledge required to extend it safely.

Outcome

The client gained a cleaner AWS operating model, a more production-ready deployment foundation, and a platform architecture that could support additional teams without repeating early design mistakes.

Project Snapshot

Category

Cloud Architecture

Sector

AWS Architecture

Duration

18 weeks

Next Step

If this project is close to the work your team is planning, Ideamics can discuss comparable architectural decisions, delivery sequencing, and implementation tradeoffs in more detail.

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