A monolithic ticket sales application suffered crashes during high-demand events. The Node.js app ran on-premise with MySQL and local storage, causing slow image loads and database locks.

Migrating to AWS addressed scalability issues. EC2 instances with Auto Scaling Groups handle traffic spikes, while Amazon RDS manages the database. Static files moved to S3 with CloudFront for faster delivery.

Architects implemented a three-tier VPC for security. ElastiCache resolved session management and race conditions by centralizing state and ensuring data integrity during concurrent purchases across distributed servers.

This rearchitecture replaced fragile infrastructure with an elastic system ready for real-time transaction demands, demonstrating how cloud strategies solve core distributed computing challenges.