On stage

Building in a day. Deciding with evidence.

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Topics

Rapid product discovery

01Judgment over speed
02Test it in a day
03Facilitation that decides

Appearances

How to Web — Bucharest

Bucharest Romania

How to Web

90-minute live demo

Stop shipping what nobody asked for

I closed Day 1 of How to Web on the main stage with a live demo of rapid product discovery. The room voted twice, I built the prototype in Lovable, and Uxia's synthetic users tested it.

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UX Camp Europe — Berlin

Berlin Germany

UX Camp Europe

23–24 May 2026

Unconference, run twice

Vibe coding meets discovery

I brought Product Build Day to Europe's biggest barcamp. About 100 people saw the talk across two days, and on Sunday we vibe-coded live on stage.

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UXDX Community — Warsaw

Warsaw Poland

UXDX Community

Host, talk and panel

Vibe coding, UX, and the new product team

I co-hosted the UXDX community night in Warsaw, gave my Product Build Day talk, then joined a panel on what AI does to UX and dev.

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Book me

Running a meetup, an internal event, or a conference and want an honest, hands-on talk about building products with AI in a single day? Write to me: the contact form.

Twenty minutes on stage is a trailer. The build day is the film.

See the case studies Read the manifesto

Product Build Day. One day in. One decision out.

One-day, in-person vibe-coding build days where product people who do not code build working apps with AI tools and test them the same day. Tools like Lovable, Bolt, Replit, and Cursor do the typing. You do the thinking. Run in English across Europe by Marcin Klimaszewski.

Product Build Day // Pro, 690 EUR per seat

Build it. Test it. Pitch it. One-day AI prototyping training for product managers and designers in Berlin on 26 November 2026. Build a working prototype against one shared brief, test it with users and pitch it to the people who decide. A curated group of 12, 690 EUR per seat until 31 October, 790 EUR after, invoiced to your company, no VAT. See the Berlin training.

Product Build Day // Teams, from 7,900 EUR net

The same method inside your company. Up to 20 people build against your riskiest bets, with synthetic user testing included, real-user testing optional, a written debrief within a week, and a go, pivot, or stop decision made in the room. About 395 EUR a head at full size, one invoice, NDA-friendly. It starts with a free 15-minute fit call. Book the call.

Free community evenings, autumn 2026

Free evenings run three hours, usually 18:00 to 21:00. Copenhagen runs 17:00 to 20:00. They are free, in English, 16 seats per city: Amsterdam 14 September, Copenhagen 15 September, Stockholm 16 September and Berlin 17 September. See all events.

Proof

21 non-coders shipped 21 working apps in one Saturday in Warsaw. A museum set the brief and 22 people built the answer in Athens. Ionian Technologies built four product directions in one private day in Thessaloniki and tested them on the street the same afternoon. Both public days sold out.

Contact

One inbox for everything: the contact form or contact@productbuildday.com. Answered within a business day.