What I Built I decomposed a monolithic Terraform state containing 19 logical AWS infrastructure components into a Terragrunt monorepo. This migration established isolated state files for each component—including VPC, EKS, and RDS—to enable independent locking, reduced blast radius, and faster plan performance without triggering any infrastructure changes or downtime. System Architecture Monolith State — A single S3-backed state file containing all 19 infrastructure components under a nested module hierarchy. Terragrunt Modules — 13 independent module directories, each inheriting root configuration and managing a unique S3 state key. Dependency Graph — Explicit inter-module wiring using Terragrunt dependency blocks to pass versioned outputs between isolated states. Core Technical Behavior The system runtime behavior changed from a single global lock to a per-component locking model.…