How scaling only cart and checkout during Black Friday saved $185K and rewrote our playbook for composable commerce agencies

https://www.slideserve.com/botwingtdn/transforming-a-500k-year-monolith-by-february-3-2026-practical-paths-and-trad

How a mid-market ecommerce brand avoided a six-figure cloud bill on Black Friday Three holiday seasons ago we were running a typical composable commerce setup: headless storefront, several microservices for product and inventory, a session