Architecture · 8 min · 2026-07-01
Designing a Scalable E-commerce Architecture
Practical boundaries for catalog, cart, inventory, payments and order state in Node.js systems.
E-commerce systems fail when cart, inventory and order state blur together.
Keep catalog reads cheap, treat inventory mutations as transactional, and make payment confirmation idempotent. Order state should move through explicit transitions — not ad-hoc status strings.
This article is a practical checklist, not a framework endorsement. Use the same boundaries whether you ship on MongoDB or PostgreSQL.