The Coder Cafe

The Coder Cafe

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Working on Complex Systems
 • Teiva Harsanyi
So, I Wrote a Book
 • Teiva Harsanyi
Unit Tests As Documentation
 • Teiva Harsanyi
Functors, Applicatives, and Monads
 • Teiva Harsanyi

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How Linux 7.0 Broke PostgreSQL
Linux 7.0 delivered roughly half the throughput of Linux 6.x on the same hardware and workload.
 • Teiva Harsanyi
The Reading Room is Open
And You're Invited
 • Teiva Harsanyi
Systems Thinking Explained
Your system isn't broken because of bad engineering. It's broken because you're reacting to events without seeing the structure that produces them.
 • Teiva Harsanyi
The Coder Cafe
The Coder Cafe
AI is getting better every day. Are you? At The Coder Cafe, we serve fundamental concepts to make you an engineer that AI won't replace. Written by a Google SWE, trusted by thousands of engineers worldwide.
The latest from
Teiva Harsanyi
How Linux 7.0 Broke PostgreSQL
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Concepts

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How Linux 7.0 Broke PostgreSQL
Linux 7.0 delivered roughly half the throughput of Linux 6.x on the same hardware and workload.
 • Teiva Harsanyi
Systems Thinking Explained
Your system isn't broken because of bad engineering. It's broken because you're reacting to events without seeing the structure that produces them.
 • Teiva Harsanyi
How an SSD Works
Your SSD doesn't just store data, it relies on quantum physics to do it.
 • Teiva Harsanyi
Working on Complex Systems
My Talk at the Monster SCALE Summit 2026
 • Teiva Harsanyi
3 Bullets and a Call to Action
When communicating via email or chat, people prefer short and memorable messages that do not require too much cognitive effort to process.
 • Teiva Harsanyi
The Cold Start Problem Explained
The cold start problem is a chicken-and-egg trap: no users without value, no value without users.
 • Teiva Harsanyi
Linus Torvalds vs. Ambiguous Abstractions
There’s no issue with abstracting code into a helper function. If we want to optimize for cognitive load, the intent should be as clear as possible…
 • Teiva Harsanyi
Nothing Beats Kindness
No act of kindness, no matter how small, is ever wasted.
 • Teiva Harsanyi
Horror Coding Stories: Therac-25
In total, there were six known radiation overdoses involving the Therac-25,and at least three were fatal.
 • Teiva Harsanyi
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