You can’t A/B test your way to PMF

There is a quote by the founder of Notion about building new products that I’ve found myself coming back to:

Jan 29 • Viktor

5

2

December 2025

2025 review

One of my favorite annual rituals is writing this review. It forces me to slow down, look back at what I actually accomplished, where my life is…

Dec 11, 2025 • Viktor

10

1

October 2025

The path to engineered luck

For years, I’ve tried to rationalize luck—to see if it’s something I could attract or engineer. In tech, people believe luck can be engineered. Just…

Oct 14, 2025 • Viktor

8

2

August 2025

The ascending world

The ascending world: forward-looking, expecting next year to be better by design, not by chance.

Aug 16, 2025 • Viktor

5

2

July 2025

50 things I know #2

Last year, I published 50 Things I Know—lessons I’ve picked up over time. More notes to myself than advice for others. Since then, I’ve kept collecting…

Jul 26, 2025 • Viktor

5

3

Sell something people want

These days, I spend most of my time building new products, but there was a stretch where go-to-market (GTM) was all I thought about.

Jul 20, 2025 • Viktor

2

Signal, noise, and clarity

Exceptional input, exceptional output

Jul 13, 2025 • Viktor

5

2

3

May 2025

The gravity of hubs

If you study history, the pattern becomes obvious. The top people of any generation, artists, scientists, entrepreneurs, often knew each other…

May 30, 2025 • Viktor

5

2

Addicted to the Maze

The startup maze is addictive because it offers emotional rewards you can’t get in safer environments. It satisfies something primal, a need to struggle…

May 26, 2025 • Viktor

3

2

The real reason startups fail

In Greek mythology, Sisyphus was condemned to a peculiar kind of hell: to push a massive boulder up a hill, only to watch it roll back down every time…

May 15, 2025 • Viktor

3

2

1

Lessons from living across the trust spectrum

tl;dr - Trust is not binary.

May 1, 2025 • Viktor

1

1

1

April 2025

The last engine of social mobility

Startups are chaotic, unfair, and exhausting — but for outsiders, they’re still the fastest way up.

Apr 23, 2025 • Viktor

4

2