
Master system design concepts, engineering fundamentals, and interview basics. Weekly summaries, post-mortems, and advice for 42,000+ engineers.
| Platform | Pricing | Freemium | Publishes | Twice weekly | |
|---|---|---|---|---|---|
| Issues | 152 | Founded | 3 years ago | Last Issue | 2 days ago |
| Active | |||||

A quick update before we get into it.
Last year, 230 of you took a survey about a tool to keep your system design knowledge sharp using real case studies like the ones we cover here, and to actually help with interview prep without being j...
Every engineer on your team is using AI.
Every engineer on your team is using AI. Most of them are also re-explaining the same context from scratch every single session. Their stack, their conventions, their preferences, their constraints....
How Netflix Killed the Worst Part of Being On-Call
TLDR Netflix runs on thousands of microservices. When one breaks at 3am, the on-call engineer needs to know what depends on it, what it depends on, and whether the problem is local or upst...
The framework that turned a 36-hour database operation into two hours of mostly waiting
TLDR Discord’s Persistence Infrastructure team runs every ScyllaDB cluster behind messages, channels, servers, and most of Discord’s user data. Dozens...
How Atlas built a predictive auto-scaler that scales before your servers break a sweat
TLDR Reactive auto-scaling has a fundamental problem: by the time it kicks in, you’re already overloaded. The scaling operation itself takes several min...
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The writers behind this newsletter.
Real talk about building systems that work. Career advice for growing engineers, how actual companies solve large-scale problems, post-mortems from things that broke, and the system design fundamentals that matter. No fluff, no buzzwords.
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