Building Zero-Shared-State Auth Middleware and Real-Time Whisper STT Pipeline for Voice AI

I recently built a production-grade real-time Voice AI workspace from scratch. While the whole system has many moving parts, two components required the most careful engineering: the authentication middleware between services and the Speech-to-Text (STT) pipeline. Here’s exactly how I approached and solved both. The Middleware Problem I needed two local microservices - a WebRTC audio server and a FastMCP server - to communicate securely. I didn’t want to