Terraform AWS Foundations

Terraform works best when the structure of the code matches the structure of the platform. A good foundation is boring in the right ways: clear modules, explicit inputs, readable plans, and environments that can be changed without surprise.

Useful module boundaries

I prefer modules that map to stable infrastructure concerns:

• Network foundations
• IAM roles and policies
• Compute and cluster primitives
• Observability and operational access
• Shared DNS and certificate resources

Modules should hide repeated wiring, not important decisions. If a reviewer cannot understand the impact of a plan, the abstraction is probably too clever.

Reviewable plans

Small changes are easier to reason about. I try to keep Terraform workflows focused on readable diffs and predictable state boundaries:

resource "aws_security_group_rule" "https_ingress" {
  type              = "ingress"
  security_group_id = aws_security_group.app.id
  from_port         = 443
  to_port           = 443
  protocol          = "tcp"
  cidr_blocks       = var.allowed_cidrs
}

The best infrastructure code makes the blast radius visible before apply.

Where I am going deeper

My current focus is building reusable AWS patterns around Terraform, Kubernetes integration, IAM least privilege, and operational guardrails for platform teams.