How SCHIP Replaced 30 Cluster IaC Tools with One Terraform Codebase
SCHIP rewrote the infrastructure of 30 Kubernetes clusters, replacing a tangled mix of Sceptre, CloudFormation, and CDK with a modular Terraform codebase. By breaking the migration into tiny, automated steps and codifying architectural decisions in ADRs, they kept the platform stable while cutting future maintenance overhead. The playbook shows how disciplined iteration can tame massive IaC rewrites.