Project Overview: High-Availability, Three-Tier AWS Architecture

We engineered a robust and highly scalable solution for a modern web application, separating it into distinct presentation, application, and data layers. The entire infrastructure is hosted within AWS and uses native services to ensure automatic scaling, resilience, and secure deployment.

Key Business Impact

Area	Impact	Description
High Availability & Fault Tolerance	Maximum Uptime	By distributing traffic across multiple Availability Zones (AZs) using Elastic Load Balancers (ELBs) and leveraging an Auto Scaling Group (ASG), the application can survive the failure of an entire data center without service interruption.
Scalability	Handles Any Traffic Load	The ASG automatically adds or removes EC2 instances based on demand, ensuring performance is maintained during peak usage while controlling costs during low periods.
Security	Data Isolation	The application is segmented into secure Public and Private Subnets within a VPC. The critical database (RDS) is isolated in the Private Subnet, inaccessible directly from the internet.
Deployment Efficiency	Automated Releases	The AWS Code suite (Pipeline, Build, Deploy) automates the release process, ensuring rapid, consistent, and safe deployments of new features and updates.

Technology Stack Used

Our solution is built on a strong foundation of AWS services and modern application frameworks:

A. Application & Data Components

Category	Technology	Role in the Solution
Presentation Layer	React	The central repository where the Developer pushes code, triggering the pipeline (Pull Code).
Application Packaging	Docker	The front-end framework, delivering the modern, interactive user interface.
Database Layer	MySQL (MySql Logo) on RDS	The managed relational database service (RDS) ensures a highly available, patched, and backed-up data store for the application.

B. AWS Infrastructure (Architecture)

Category	Technology	Role in the Solution
Networking	VPC (Public & Private Subnets)	Provides a logically isolated network in the AWS Cloud. The Public Subnet hosts internet-facing resources; the Private Subnet secures the database (RDS).
Load Balancing	Elastic Load Balancer (ELB)	Distributes incoming web traffic across instances in Availability Zone 1 and 2 for redundancy.
Compute	EC2 Instances & ASG	The EC2 instances run the application (Node.js and React). The Auto Scaling Group (ASG) manages instance health and dynamically scales the number of instances to meet demand.
Database	RDS Instances	Managed database instances located securely in the VPC-Subnet-Private to restrict external access.

C. DevOps and Monitoring

Category	Technology	Role in the Solution
CI/CD Orchestration	AWS CodePipeline	Defines and orchestrates the entire continuous delivery workflow.
Build & Test	AWS CodeBuild	Compiles source code, runs tests, and produces deployable artifacts.
Deployment	AWS CodeDeploy	Automates the deployment of the application artifact to the EC2 instances with strategies for minimal downtime.
Monitoring	AWS CloudWatch	Collects metrics and logs from the EC2 instances and RDS database, providing centralized monitoring and setting up crucial alarms.

This complete, cloud-native architecture provides the foundation for sustained growth, reliability, and agility.