BACKEND ARCHITECTURE MASTERY Day 7: The OAuth Lie and The Architecture of Global Trust 16 min read Series: Logic & Legacy Day 7 / 30 Level: Senior 📍 Table of Contents (Click to Expand) 1. The Enterprise Nightmare: Scaling Identity 2. The OAuth 2.0 Lie 3. Enter OpenID Connect (OIDC) 4. Code: Building an OIDC Federation Engine 5. The Architecture of Trust: JWKS Explained 6. Day 7 Project: The Audience Substitution Trap 7. Deep Diver Resources 8. Frequently Asked Questions (FAQ) ⏳ Context: Building a login system for a single web app is easy. Building a login system for a Fortune 500 company is a nightmare. Imagine a corporate employee needing to access Jira, Workday, Salesforce, and 40 internal microservices. If you force them to create and remember 43 different passwords, you will bankrupt the IT helpdesk in password reset tickets alone. To survive, enterprises decouple identity from the application. They centralize trust.…