E-commerce Platform Migrates to Serverless
Challenge
Monolithic application couldn't handle Black Friday traffic spikes without massive over-provisioning.
Solution
Decomposed order processing into event-driven serverless architecture using Lambda, SQS, and EventBridge.
Results
99.9% uptime during peak events, 60% infrastructure cost reduction, deployment time from hours to minutes.
This mid-size e-commerce company was running their entire application on a fleet of EC2 instances behind an ALB. Every Black Friday and major sale event required weeks of preparation — manually scaling up instances, load testing, and keeping fingers crossed.
We identified the order processing pipeline as the highest-value target for serverless migration. The existing system processed orders synchronously, creating bottlenecks during traffic spikes.
The new architecture uses EventBridge for order events, SQS for reliable processing, Lambda for business logic, and Step Functions for the fulfillment workflow. Each component scales independently based on demand.
The result: their last major sale event handled 3x the previous peak traffic with zero incidents, while running costs were 60% lower than the provisioned EC2 fleet.