Jun 19, 2026 · DEV Community
What a Realistic AWS 3-Tier Terraform Project Teaches Developers
A practical look at how Terraform, AWS networking, autoscaling, secrets, and observability turn a simple app into a production-style platform.
Curated coding article
Summary
A practical look at how Terraform, AWS networking, autoscaling, secrets, and observability turn a simple app into a production-style platform.
A simple frontend and API can teach a lot when the infrastructure is designed like a real service. This AWS 3-tier Terraform project uses a Node.js frontend, a Go REST API, RDS, autoscaling groups, load balancers, private networking, Secrets Manager, CloudWatch, and SSM Session Manager to model the kind of environment developers often meet after code leaves localhost.
The strongest lesson is separation of responsibility. The frontend and backend sit behind different Application Load Balancers, with the backend load balancer kept internal. That means the API is not directly exposed to the public internet, and traffic has to flow through intentional security boundaries instead of relying on application code alone.
For developers, this matters because infrastructure choices affect debugging, deployment, and incident response. Splitting frontend, backend, and database access into separate subnet and security-group layers makes failures easier to reason about. It also limits blast radius if one tier is compromised or misconfigured.
The project also highlights practical trade-offs. A single NAT Gateway keeps demo costs lower but reduces availability. Secrets Manager avoids hardcoded credentials, while Terraform state still needs careful protection. SSM Session Manager reduces SSH key management, and enforcing IMDSv2 helps defend against metadata credential theft.
This is the kind of portfolio project that shows more than framework knowledge. It demonstrates that you understand deployment paths, health checks, autoscaling delays, observability, private networking, and the operational decisions that make software maintainable after launch.