# System Design Classroom

> A System Design Newsletter to help you build better software.

- **Platform:** substack
- **Category:** Education
- **Subscribers:** 62K
- **Paid subscribers:** 4K
- **Weekly growth:** +0.8%
- **Monthly growth:** +2.9%
- **Last updated:** 2026-10-15
- **URL:** https://newsletter.systemdesignclassroom.com
- **Profile:** https://newsletterinsights.io/newsletter/newsletter-systemdesignclassroom-com

## Recent Posts

- [Bad Retries Can Break Good Systems](https://newsletter.systemdesignclassroom.com/p/bad-retries-can-break-good-systems)
- [Why Just Publishing Events Isn’t Enough ](https://newsletter.systemdesignclassroom.com/p/why-just-publishing-events-isnt-enough)
- [Retries Have an Evil Twin: Duplicates](https://newsletter.systemdesignclassroom.com/p/retries-have-an-evil-twin-duplicates)
- [I used to think testing in production was a bad joke. I was wrong.](https://newsletter.systemdesignclassroom.com/p/testing-in-production-best-practices)
- [Event-Driven Systems Are Easy to Build but Hard to Keep Correct](https://newsletter.systemdesignclassroom.com/p/event-driven-systems-are-easy-to-build-but-hard-to-keep-correct)
- [What if this happens twice?](https://newsletter.systemdesignclassroom.com/p/what-if-this-happens-twice)
- [Safe Database Rollback Starts Before Deployment](https://newsletter.systemdesignclassroom.com/p/safe-database-rollback-starts-before-deployment)
- [Good System Design Starts With Constraints, Not Diagrams, Not Tools](https://newsletter.systemdesignclassroom.com/p/most-engineers-learn-system-design-backwards)
- [Most Engineers Want Both Consistency and Scalability.](https://newsletter.systemdesignclassroom.com/p/most-engineers-want-both-consistency-and-scalability)
- [What Works in a Monolith Can Break a Microservice](https://newsletter.systemdesignclassroom.com/p/what-works-in-a-monolith-can-break)