Book cover: The Code Was Never the Hard Part. Find the Right Problem, Prove Demand, and Launch AI-Built Products People Actually Want

The code was never the hard part.

AI made building faster. It did not tell you what deserves to exist. This practical book shows you how to find the right problem, prove demand, and launch a product people actually want before you ship the wrong thing.

20 years building 500,000-user startup Solo AI product builder

One loop, from first signal to honest verdict.

Fourteen chapters in four parts. Weeks of thinking, a short sharp build at the end, and a verdict you can trust, whatever it says.

PART I

Choose

Pick your race, spot the signals other people scroll past, and gather evidence from real conversations. A five-question filter decides what deserves your months.

PART II

Shape

Compress what you learned into a one-page concept, a price with a reason behind it, words a stranger understands in ten seconds, and a name you stop agonizing over.

PART III

Ship

Plan together with AI, build the first version in a focused sprint, launch without an audience, and read the response honestly: kill, redirect, or double down.

PART IV

Run

Operate as a one-person company: your week as a portfolio, energy as the real runway, and a loop that gets sharper every time you run it.

From the introduction

I once co-founded a company that had half a million users, forty million video views a month, and eight hundred thousand euros in annual revenue.

It failed anyway.

The code worked. The code was never the problem.

From the introduction, free with your signup.

Portrait of Oskar Glauser

I learned this from products that worked and products that failed anyway.

I am . I co-founded a startup that reached 500,000 users and still failed, bootstrapped a product that has survived for more than a decade, and built an app for one of the world's largest retailers that worked before a reorganisation shut it down.

Last year I built more than twenty apps with AI and released two, so I know the new trap from the inside as well. This book is the map I wish someone had handed me, and it is being validated with its own method: the page you are reading is one of its chapters in action, and the signup numbers will be published here, whatever they say.

20years building products
500kusers reached by one startup
10+years for a bootstrapped product

The practical material stays useful after the tools change.

  • Every worksheet will be free here: the problem filter, interview guide, one-page concept, build brief, and launch checklist.
  • The book stays tool-agnostic so it will not date quickly. A regularly updated tool guide will live on this site.
  • Readers will get filled examples as well as blank templates, so every exercise starts with something concrete.

Start with chapter one.

Learn why cheaper code makes choosing the right problem more important, not less.

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