I engineered and deployed a High Availability (HA) three-tier web application architecture on AWS, built inside a VPC spanning multiple Availability Zones to ensure continuous uptime and fault tolerance. The design uses public, private application, and private database subnets, enforcing strict network isolation and enterprise-grade security.
The public tier hosts an internet-facing Application Load Balancer (ALB) that distributes traffic across AZs and performs real-time health checks. The application tier runs on EC2 instances inside private subnets, orchestrated by an Auto Scaling Group (ASG) with launch templates for consistent, repeatable deployments. The database tier uses Amazon RDS MySQL configured for Multi AZ failover, automated backups, and private-only access.
To validate the architecture’s resilience, I performed controlled failure testing by manually terminating active EC2 instances. The ASG immediately replaced them, and the ALB seamlessly routed traffic to healthy targets with zero downtime. The application remained fully accessible throughout the test, confirming the system’s ability to self-heal, scale automatically, and maintain strict tier isolation.
This deployment demonstrates my ability to design and operate production-ready, secure, and fault-tolerant cloud architectures aligned with modern DevOps and AWS best practices.
I want to sincerely thank my mentors, Pravin Mishra, Praveen Pandey, Abhishek Makwana, Mobarak Hosen, Onuche Paul
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