A Battle-Tested Playbook for Migrating Critical E-Commerce Functionality from Monolith to Microservices Migrating major functionality out of a monolith is like swimming against a relentless current. The gravitational pull of tightly coupled systems, undocumented business logic, and years of accumulated requirements makes every extraction feel like light trying to escape a black hole. Yet here we are, on the other side, with a playbook that transforms high-stakes releases into