A headless e-commerce platform handling 100K+ concurrent users during flash sales with zero downtime.
An existing monolithic e-commerce platform buckled under flash sale traffic, causing cascading failures across checkout, inventory, and payment systems. The monolith could not scale individual services independently, leading to over-provisioning and 60% infrastructure waste. Migration needed to happen without any downtime during peak selling season.
We decomposed the monolith into domain-driven microservices: Catalog, Cart, Order, Payment, and Inventory — each independently deployable. A Strangler Fig pattern enabled incremental migration with feature flags routing traffic between old and new services. AWS ECS with Fargate provided auto-scaling, while CloudFront and Redis caching reduced origin load by 80%. A custom inventory reservation system prevented overselling during flash sales using distributed locking.
The platform now handles 100K+ concurrent users with zero downtime during flash sales. Page load time dropped to 1.2 seconds globally. Infrastructure costs decreased by 35% while supporting 3x the traffic. Revenue increased 180% year-over-year as the platform scaled to new markets.
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