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Running backend logic without managing servers. Covers Lambda functions, event triggers, execution models, permissions, and using Lambda to power APIs and background tasks.

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Day 13: Build your secure backend trigger

· 37 min read
Norah Klintberg Sakal
Norah Klintberg Sakal
AI Consultant & Developer

Build your secure backend trigger

What you'll learn

How to build a secure Lambda backend with API Gateway and Cognito authorization to trigger AI calls

Why you need a secure trigger​

Day 12: You build a protected frontend

Today: We build the secure backend that triggers calls

Here's the critical security issue:

Remember your ALB endpoint we built on Day 9 ↗?

https://ai-caller.yourdomain.com

If we add a /make-call endpoint directly to Fargate:

POST https://ai-caller.yourdomain.com/make-call
→ Publicly accessible
→ Anyone can trigger calls
→ Could rack up *huge* OpenAI/Twilio bills
→ Even with frontend auth, the endpoint is exposed

This is not acceptable.