#ssl

How I Solved AWS ALB's 25 SSL Certificate Limit for SaaS Custom Domains

Handling custom domains in a SaaS product looks simple — until your 26th customer signs up and ALB refuses to attach another SSL certificate. Here's the production architecture I built with Caddy, Let's Encrypt, and NLB to support thousands of custom domains, and the new CloudFront SaaS Manager alternative that showed up in April 2025.

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Raunak Gupta·Apr 22·18 min