Product Build Day // Pro
Build it. Test it. Get the decision.
One hands-on day in Berlin. You build a working prototype with AI, test it with users and bring the evidence to the person who decides.
Next date
Thursday, 26 November 2026, 09:00 to 17:00 CET, Berlin
A curated group of 12, at small tables with the same people all day
In English, in person, lunch and two breaks included
Why this day is different
Building with AI is the easy part, so it gets two hours. The rest of the day is testing and deciding
Your prototype gets tested the same day, by AI testers and by the people at your table
Each person makes a three-minute case with questions, first at the table, then selected cases for the room
Everyone builds on the same brief with sample data, so no company data goes into AI tools
A 45-minute follow-up with the trainer, where you run the method on your own idea
What you take back to work
A working prototype at a URL
Usability findings from your own tests
A plan for the first test with real customers, with the number that means go
A three-minute case, rehearsed with questions
One page your boss can say yes or no to
Your trainer
Marcin Klimaszewski built this format and runs product discovery workshops across Europe. Before going solo he led a 35-person UX team in five countries at Sanoma Learning. Certified Lovable Expert.
Product Build Day in 2026
130+ people trained in 6 countries
Participants work at FlixBus, DERTOUR, Too Good To Go, Rovio, Microsoft and Ørsted
“Really great experience. Marcin did an amazing job to keep everyone engaged.” Umair Alam, Sr. Data Analyst, Flix, Berlin
Price and booking
€790 per seat, or €690 if you book by 31 October
Invoiced to your company, no VAT (small business exemption, § 19 UStG)
Every third seat is free: 3 seats for the price of 2, 6 for the price of 4
Waiting for your manager’s approval? You can request a seat now, nothing is charged at that stage
No cancellation or refund. You can transfer your seat to a colleague until 24 November
An idea that cannot survive a day is not worth a quarter.