Koen Lee
KL

Hi — I'm Koen. I write things down here so I understand them better.

I build software and run a small business, and both of those turn out to be mostly the same problem: figuring out what deserves your attention. So I write about that — sometimes as code, sometimes as work, sometimes just as a Tuesday morning that went unusually well.

Nothing here is on a schedule. An essay shows up when I've thought about it long enough to be sure I mean it, which is roughly every other week. If that sounds like your pace, there's a letter you can join.

— Koen

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Technology
The case for patient software

Most software is built to be shipped, not to be lived with. What changes when you design for the next ten years instead of the next sprint.

Business
Small enough to run alone

Everyone asked when I was going to hire. Four years in, here's the honest ledger of staying a company of one.

Life
A quieter morning

I gave up the first two hours of my day to my inbox for about a decade. Here's what I put there instead.

Technology
In praise of a boring stack

I keep choosing tools that were already old ten years ago, and I keep not regretting it.

Life
On rereading the same five books

I stopped chasing new titles a while ago. The old ones kept getting better, which was not what I expected.

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Technology

Software I've built, maintained, or had to apologise for. Mostly about durability — why the boring choice usually outlives the clever one.

Business

Running something small on purpose. Pricing, customers, saying no, and the arithmetic of not growing.

Life

Attention, time, books, walking. The unglamorous parts that turn out to decide everything else.

What I'm doing now

Rewriting the guts of an eight-year-old app I still use daily, reading Ursula Franklin for the third time, and trying to keep my afternoons free of meetings entirely.

Updated August 2026 · the longer version

A letter, every other week

When something new goes up here, I send it out with a short note about what I was actually thinking while writing it. That's the whole thing — no digest, no round-up, no course at the end of it. Leave whenever you like; the unsubscribe link is at the top of every email, not buried at the bottom.

1,400 or so readers. I never sell or share the list — it lives on my own server.