Managing Terraform State at Scale.

At scale, Terraform requires remote state, state locking, and workspace isolation to prevent corruption and manage multiple environments.

Remote backends (like AWS S3) centralize the terraform.tfstate file. State locking (using DynamoDB) prevents concurrent executions from corrupting the state. Workspaces allow you to use the exact same Terraform code for dev, staging, and prod by creating separate state files per workspace. For massive infrastructures, the code itself should be split into smaller, decoupled state files (e.g., networking vs applications) using terraform_remote_state data sources.