Published Apr 27, 2026
High‑Traffic E‑commerce Engine
Engineered for a regional retail giant handling 200K+ daily transactions. Elastic scaling, sub-100ms response, and zero downtime during flash sales.
Challenge: A growing e-commerce brand experienced checkout failures and database deadlocks during flash sales. Their monolithic platform could not scale beyond 500 concurrent users.
Solution: ON DM decomposed the monolith into event-driven microservices with an API gateway. We implemented Redis-based session stores, read replicas for catalog queries, and a queue-based order processor to absorb traffic spikes.
Key Results:
15x increase in concurrent checkout capacity (500 → 7,500+ users)
99.97% uptime during highest-traffic event (Black Friday)
Average page load reduced from 2.1s to 180ms
Zero lost orders due to system failure
Tech Stack: Node.js (NestJS) · PostgreSQL read replicas · Redis Cluster · RabbitMQ · Kubernetes (EKS) · CloudFront CDN
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