Cutting Monolith Latency by 68% and Saving $18k/Month: The 'Shadow-Route Strangler' Pattern for Zero-Downtime Migration
Current Situation Analysis When we inherited the core billing monolith at a Series D fintech, the codebase was 520k lines of Go. Deployment took 45 minutes. A single database lock could take down the checkout flow for 40% of users.
