AWS Cognito Refused to Cooperate. So I Made Google and Cognito Think They're Talking to Each Other.(Nestjs)
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TL;DR - Verified Google tokens server-side, created Cognito users via admin APIs with email_verified: true, generated deterministic passwords from user IDs + a server secret, and bypassed Cognito's hosted UI entirely. Works for signup and sign-in. Not for everyone, but perfect when you can't use Cognito's standard federation. The Constraint: No Console Access, No Hosted UI I inherited a broken authentication system. No AWS console access. No ability to change the login UI. And a ha