Product Build Day // Podcast
by Marcin Klimaszewski
Building got cheap. Deciding got hard. You can vibe code a working app in five minutes now, so the hard part is finding out which idea is worth building. I'm Marcin Klimaszewski. I run Product Build Day, and in every episode answer one question that product managers, designers and founders keep asking, in about ten minutes. Topics: product discovery, testing ideas, vibe coding and prototyping with AI. Each episode brings a real story from our build days across Europe, numbers with sources, and one thing to try this week.
Episodes
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Don't ask for a project. Ask for one day that earns the next one.
This spring, 85 percent of the finance chiefs Deloitte asked in twelve European countries said now is not the time to take on more risk. A request for a project gets a no. A day is a small risk with a ceiling. Ask for one day with a number that could kill the idea, put the do-nothing option on…
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Why the decision is made before your first slide
Show people the same idea twice, and the second time they rate it almost a full point higher. The decision about your idea starts before your first slide. The meeting is the second time they see your idea. Make sure the first time happened: a link two days ahead, the first slot on the agenda, and…
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How do you do discovery when nobody gives you the time?
Almost everyone says AI saves them time. Few can say where that time went. And 71 percent of product people say they don't spend enough time with customers. Nobody gives you time for discovery. Claim ninety minutes a week, the same slot every week, and name it after one decision. What you'll…
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My CEO counts AI features. What now?
Ninety-six percent of companies plan new AI features. For most of them, the revenue impact stays below ten percent. So what do you do when your CEO counts AI features? The CEO's wish is reasonable. The unit is wrong. Count customer problems where a number you already track moved, and let AI…
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"I think this is a good idea" isn't enough. What is?
"I think this is a good idea" is not enough. Product owners in the Netherlands gave that advice to new colleagues this year. So what is enough to win your idea a place on the roadmap? A one-pager full of conviction answers one question, and only in words. Bring a prototype your boss can click, a...
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Stop looking for the perfect prompt. Start building, then iterate.
In Bucharest I had ninety minutes on stage to build an app, test it and fix it, and the room had just voted on what I'd build. My first prompt was everything in my head, dictated in one go, filler words included. It's AI. It will understand you anyway. Say it all once, press the button, and do…
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The skill that's still rare when everyone can build
LinkedIn stopped training junior product managers and started training product builders. Its chief product officer at the time, Tomer Cohen, put it in one line: "We're going to teach them how to code, design, and PM at LinkedIn." So if everyone can build now, which skill is still rare? Building...
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Hackathons for people who don't code
A day of building teaches you the tools. Delivering a better product takes a decision and a test. Inside a company, a hackathon is worth it when it ends with both. What you'll hear: What happens to hackathon projects afterwards What I changed after the first of four September evenings in…
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Hand your CPO a better hour
Your CPO looks after many teams, so your idea gets twenty minutes between two meetings, and the decision happens later, somewhere else. This episode is about another way: your whole team vibe codes a few versions of the solution, you test them, and your CPO comes for the last hour of the day. You...
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470 visitors, 3 clicks. Continue or stop?
"Landing page visitors: 470. Users who took purchase action: 3. Given these metrics, should I continue pursuing this idea?" Someone asked that on Hacker News, and nobody could answer, because the number that would answer it was never written down. This episode is about setting your metrics before...
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Can you trust synthetic users?
"It really felt like you were going through a survey and reading real comments." Someone said that at Product Build Day Stockholm, after their team tested a prototype with synthetic users. More than 100 people ran synthetic tests in my rooms this year. So can you trust synthetic users? There are...
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Four people alone had twice the ideas of four together
"Who produces better ideas: individuals or teams?" Stanford's d.school asks that in its online library of design questions. The usual answer at work is to start together, all in one room. But in a study from Wharton and INSEAD, groups that spent the first ten minutes alone came up with about…
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A prototype is an instrument with an end date
"Did you really throw everything away, or only the code?" Someone asked that on a French forum, under a post from a developer who vibe coded an app for a month, about 20,000 lines of code, and then threw it all away. AI-built prototypes look finished, so the usual move is to call them version one...
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Should product managers learn to vibe code?
Your boss is probably vibe coding more than you are. In a French survey of 1,031 people in product teams, 29% of CPOs said they use a vibe coding tool, against 12% of product owners. So yes, learn it. The tools take one afternoon. The skill that takes practice is writing the challenge: one or two...
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You built it. Now try to kill it.
A startup founder told me they can vibe code faster than their dev team, and they still don't know what to ship. I hear the same question at every conference and in almost every conversation with product managers. When anyone can build a working first version in about five minutes, "it works"…
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Welcome to Product Build Day // Podcast!
Building got cheap. Deciding got hard. This year, over 120 people joined Product Build Day in six European cities to build an idea with AI and test it within one day. A working first version took minutes. The hard part came after: does anyone want this, and how do you find out before you spend a...
About this show
Building got cheap. Deciding got hard. You can vibe code a working app in five minutes now, so the hard part is finding out which idea is worth building. I'm Marcin Klimaszewski. I run Product Build Day, and in every episode answer one question that product managers, designers and founders keep asking, in about ten minutes. Topics: product discovery, testing ideas, vibe coding and prototyping with AI. Each episode brings a real story from our build days across Europe, numbers with sources, and one thing to try this week.
Hosted by
Marcin Klimaszewski
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