How I Let an AI Refactor My Whole Codebase (Using Gemini 3.5)

Every solo developer knows the dread of a Friday afternoon deployment. You push a minor update to a user profile component, and somehow your entire payment processing pipeline goes offline. That is the harsh reality of living with a legacy monolith. Over five years of rapid development, my side project turned into a massive web of tightly coupled logic. The user system relied on the billing system. The billing system relied on the notification service. Extracting these pieces into clean microser...