Tech Founder Stack
Mathias KlenkLessons from 2x technical founder & CTO on startups, engineering, and the hard realities of taking tech products from 0 to 1.
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 24 | Founded | 10 months ago | Last Issue | 2 months ago |
| Active | |||||
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techfounderstack.comLatest Issues
Everyone is a builder now
This article was published on November 23rd, 2025 on Design + AI(Link). I’m resharing it since it got so popular and it’s worth reading for every engineer. I wrote it together with Felix Haas.
Something different is happening in software...
Talking to Code: The Most Underrated Shift in How We Build Software
Last week I watched our CTO Aike sit down at his desk, open Cursor and spend the next 40 minutes speaking to an AI agent. Not typing instructions. Talking. Describing what he wanted, getting back questions, refining his thinking out loud. B...
Building AI Into Your Product vs. Building an AI Product
Every startup pitch deck in 2025 has “AI” on at least three slides. But behind the buzzword, there’s a fundamental strategic choice that most founders gloss over. One that shapes your architecture, your hiring, your pricing, and ultimately...
The Minimum AI Stack Every Technical Founder Should Understand
There is a particular kind of founder anxiety making the rounds right now. It sounds like this: “I don’t have a machine learning background. Am I already behind?”
The short answer is no. But there is a catch.
You do not need to understand...
How to Measure Engineering ROI Without Fooling Yourself
For most startups, engineering is the single biggest investment they make. Salaries, cloud infrastructure, tooling, opportunity cost, it all adds up quickly. And yet, when founders or boards ask, “What’s our ROI on engineering?”, the answer...
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Authors
The writers behind this newsletter.
2x technical founder & CTO. I write about the hard realities of building tech products from 0 to 1 — engineering decisions, startup strategy, and what nobody tells you until it's too late. Made the mistakes so you don't have to.
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