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 fast. Knowing what to build is still the hard part. This book shows you how to find the right problem, prove that people want it, and launch it before you've spent months on the wrong thing.

20 years building 500,000-user startup 20+ apps built with AI, two shipped

Most of the work happens before you build.

Fourteen chapters in four parts: choose the problem, shape it into a product, ship it, and keep it running. Most of the time goes into thinking and talking to people. The build comes at the end, and then you look at what actually happened.

PART I

Choose

Pick your race, spot the signals other people scroll past, and talk to the people who have the problem. Five questions tell you if it's worth your time.

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 look that earns trust before anyone clicks.

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

Run it as a one-person company: where your hours actually go, how you keep the energy up, and how every round makes the next one easier.

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.

The introduction comes with chapter one, free with your signup.

Portrait of Oskar Glauser

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

I'm . 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 a global fashion retailer that worked and was shut down by a reorganization anyway.

I've been drawing products I couldn't build since I was a kid, and in the past twelve months I've built more than twenty apps with AI and released two, so I've seen both sides: the years when building was the wall, and now, when building is the easy part. This book is the map I wish someone had handed me, and it's being validated with its own method: the page you're reading is one of its chapters in action, and the signup numbers are published here, whatever they say.

Follow @oskarglauser

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

The practical material stays useful after the tools change.

  • Every template from the book will be free here: the five-question filter, the conversation guide, the one-page concept, and the launch thresholds.
  • The book names no specific AI tools, so it won't date when the tools change. The method is the part that lasts.
  • Readers will get filled examples as well as blank templates, so every exercise starts with something concrete.

Start with chapter one.

The cheaper building gets, the more it matters what you choose to build. Chapter one is about exactly that.

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