This project demonstrates the design and deployment of a scalable three-tier web application architecture on AWS. The environment was provisioned using AWS CloudFormation to automate the creation of networking and compute resources, including the VPC, subnets, and EC2 instances.     The architecture separates the web, application, and database layers to improve security, scalability, and maintainability following AWS best practices.

The application is deployed within a Virtual Private Cloud (VPC) spanning multiple Availability Zones. The web tier is hosted on EC2 instances in public subnets and is accessible through an internet-facing Application Load Balancer. Traffic is distributed across multiple web servers using Auto Scaling groups to support scalability and high availability. An internal load balancer routes traffic from the web tier to application servers running on EC2 instances in private subnets.

The application tier communicates securely with an Amazon RDS database deployed in private database subnets. The database layer includes a primary RDS instance and a read replica to support performance and redundancy. NAT Gateways allow instances in private subnets to access the internet for updates and package installations without exposing them to inbound traffic.

Security was implemented using subnet isolation, security groups, and controlled access between tiers. This layered architecture ensures that only the web tier is publicly accessible, while the application and database tiers remain protected in private subnets. Monitoring and scaling capabilities are supported through Auto Scaling groups and AWS management tools.

This project demonstrates the implementation of a highly available and scalable AWS architecture using infrastructure automation and layered network design. The architecture is designed to support growth and can be extended with additional monitoring, automation, and deployment pipelines.