How I Deployed a Production-Ready Three-Tier Web App on AWS

How I Deployed a Production-Ready Three-Tier Web Application on AWS — From Scratch Introduction As part of my DevOps training capstone project, I recently completed one of the most challenging and rewarding hands-on projects I have ever worked on: deploying a full-stack Book Review App on AWS using a real-world, production-grade three-tier architecture. This is not a tutorial on blindly clicking through the AWS console. This is an honest account of what I designed, what broke, why it broke, and how I fixed it — because that is where the real learning happens. By the end of this post, you will understand: What a three-tier architecture is and why it matters How to design a secure AWS VPC with public and private subnets How to connect all three tiers securely using Application Load Balancers The real-world problems I ran into and how I solved them What Is a Three-Tier Architecture? A three-tier architecture separates a web application into three distinct layers, each with a specific resp