Byte-Sized Design
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 | 147 | Founded | 3 years ago | Last Issue | 9 days ago |
| Active | |||||
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read.bytesizeddesign.comLatest Issues
When "Distributed Backup" Isn't Actually Distributed: Lessons From the Coinbase Outage
The May 2026 AWS thermal event, the latency-versus-resilience tradeoff that broke coinbase, and what happens when “distributed backup” isn’t actually distributed
TLDR 23:50 UTC, Thursday, May 7 2026. A data center hall in Northern Virginia...
How Slack Keeps a Team of AI Agents from Losing the Plot
Inside the three-channel context system behind slack's security investigations
TLDR Hundreds of inference calls per investigation. Megabytes of agent output. A team of LLMs all working on the same alert, none of them sharing memory by defa...
HubSpot's 37-Minute Lesson in Why HTTP 200 Can Lie
The permission check that passed, the users who were locked out, and what monitoring for "availability" actually misses
TL;DR 3:43 PM EST to 4:20 PM EST. 37 minutes. Every HubSpot customer lost the ability to click into contact, company, o...
Slack Rebuilt Notifications for Millions of Users
Slack rebuilt its notification system from scratch, here's the architecture decision that made it possible without breaking millions of users.
Notification overload is one of the top three reasons users contact Slack support. Not security...
How Uber Killed Hours-Old Data (And Why Your Batch Jobs Are a Liability)
What they found when they finally did the math on stale data.
TLDR Hours-old data. Petabyte scale. Thousands of engineers making decisions on stale numbers.
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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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