Date
Thursday 21 January 2027
Time
18:30–21:30
Venue
Yolk
Price
Free by application
Language
English
Seats
Up to 30
The evening
Rapid product discovery, start to finish. You build within forty minutes and test before you pitch.
21:30The workshop ends. Networking after, for whoever stays.
Included
In person at Yolk. Bring a laptop and a charger. Everything runs in the browser.
What you get out of it
Founder
You can design a test that shows if people would pay, before the idea costs you a quarter.
Product person
You can put a number on go or no-go, and defend it in three minutes.
Everyone
You have built a working app with people you met at the door, without writing code.
It has run before
Warsaw, 27 October 2026. The same three hours, in the same order.
3 of 3
teams pitched a live app in Warsaw on 27 October, after about an hour of building.
Warsaw case study →Who gets a seat
30 seats. Founders Club regulars get the first ones, the rest are open to everyone in Cracow.
Who runs it in Cracow
Facilitator and Product Build Day ambassador.
Tomek is a product leader from Cracow who now works as a workshop facilitator and trainer. Product discovery is his field.
If you want to build sth real in 6 hours, while meeting cool like-minded people - do it! It will be worth your time.
The format comes from Marcin Klimaszewski, who ran it in seven European cities in 2026. He prepared Tomek for the evening and provides the materials.
The tools in the room
Lovable and Uxia have been in the room since the first open Product Build Day in Warsaw in July. In Cracow they cover the tools for every participant.
Lovable builds working web apps from a description in plain words.
On the day
Every participant gets 100 Lovable credits, sponsored by Lovable. You build with them on the night and keep building after it.
“I was also surprised that even a beginner can build a no-code app and solve problems that used to require technical skills.”
Thank you, Lovable, for the credits in every seat.
lovable.dev ↗
Uxia, from Barcelona, tests apps with AI users. Each one thinks out loud as it clicks, so you can read why it got lost.
On the day
Every participant gets a Uxia account to run two synthetic user tests, sponsored by Uxia. Accounts are opened before the evening, on the email you apply with.
“It’s very useful and surprisingly easy to set up. What really makes a difference is seeing the reasoning behind each decision the synthetic users make. A single test run provides a lot of valuable groundwork for sharpening hypotheses and preparing better questions for interviews with real people.”
Thank you, Victor and Borja, for opening Uxia to the whole room.
uxia.app ↗The venue
Yolk is a coworking space and community in central Cracow, with desks across three floors. More than 65% of its members come from abroad, and Founders Club meets here one Thursday a month.
Four honest answers
Not tonight. Everyone gets the same challenge, so you can compare your answer with what the other teams built from the same sentence. The method goes home with you and works on your own idea the next morning.
Ready?
Takes two minutes. We read every answer and reply either way.
Apply, secure your seatThe form asks for your name, email, LinkedIn, English level and a few lines on why you want to come. Founders Club regulars tick one extra box.
Something else on your mind? Use the contact form →
Already have a seat? Make your “I’m attending” image →
