A System Design Newsletter to help you build better software.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 76 | Founded | 3 years ago | Last Issue | 3 days ago |
| Active | |||||
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newsletter.systemdesignclassroom.co...Latest Issues
429s, Webhook Storms, and the Wrong Fix
I’ve known the difference between a rate limit and a throttle for years. I could draw it on a whiteboard half asleep. And one night I still picked the wrong one.
It started with my phone buzzing. One alert, then five, then I stopped counti...
Never Let the Model Choose the tenant_id
Here’s a story I don’t tell often.
A few years back, I worked on a multi-tenant SaaS platform. Hundreds of customers. One shared relational database. Every table had a tenant_id column.
Every query filtered on it. Every. Single. One.
U...
Good Saga Design Starts with the Order of the Steps
Let me tell you about Dani. She’s a composite of engineers I’ve worked with, and her story combines failures I’ve seen more than once.
Her team shipped a checkout saga that passed every review. One step per service, a compensation for ever...
AI Agents Just Rediscovered the Dual-Write Problem
This agentic case starts with a request no business owner wants, but still we should plan for: a customer asks an AI support agent for a refund.
And the agent does exactly what it is told to do: it loads the order, it reads the refund poli...
The Most Dangerous Agent Memory Was Once Correct
When I think about agent memory, I don’t think about a chatbot forgetting someone’s favorite color. I think about an agent applying information that was once correct.
Imagine your e-commerce store reduced returns from 30 to 14 days for ord...
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Authors
The writers behind this newsletter.
I simplify software engineering. Sharing lessons to help early-career developers grow as Software Engineers. I write about Systems Design, Algorithms, Good Practices, and Machine Learning.
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