Product Build Day. One day. Everyone builds. Everyone pitches.
A vibe-coding build-and-pitch day for product people who do not code. Product managers,
product owners, UX, marketing, sales, subject matter experts, heads of product. Same brief. Same clock.
Same judges. AI tools do the typing. You do the thinking.
One day in. One decision out.
Product Build Day puts the people closest to the customer in one room for one day. Everyone builds. Solo
or in teams of two or three. One brief. One clock. One set of rules. At the end of the day everyone
pitches a working prototype to a panel of judges.
No coding, no setup, no problem
You describe what you want in plain English and the tool builds it. Participants use platforms like
Lovable, Bolt.new, or Replit. By 10:30 you will be building.
What the day looks like
- 10:00. Doors open
- 10:30. The brief revealed, teams formed
- 11:00 to 14:00. Build, three hours heads down with AI tools
- 14:00. Pitches, every team presents, no exceptions
- 15:30. Voting, the audience decides
- 16:00. Winner announced
- 17:00. Drinks
Events
Upcoming Product Build Days across European cities. See what is next, suggest your city, or join the list
to hear when a date lands near you.
Next: Athens, Greece. July 2026. First edition.
Free. In person. English.
Athens, Greece. July 2026
The first Product Build Day in Greece. One Saturday in July 2026. Free, in person, English. Build
something Athens needs with AI tools. No code required.
- Date: One Saturday in July 2026
- Location: Athens, Greece
- Price: Free
- Language: English
-
Theme: Build something Athens needs (accessibility, climate resilience, bureaucracy,
small business, mutual aid)
- Partners: Product Build Day
Sign up for Athens
Manifesto
For years, the people closest to the customer have been the furthest from the build. They knew what was
wrong. They knew what to try. They wrote the brief, passed it over the wall, and waited two quarters to
find out the answer was no. That wall is gone.
Five beliefs: the right to build belongs to whoever understands the problem; a decision made in hours is
more honest than an opinion held for months; an idea that cannot survive a day is not worth a quarter; a
working thing teaches more than a perfect plan; the title a person walks in with does not decide what they
walk out with.
Read the full manifesto.
About
Product Build Day is run by Marcin Klimaszewski. Fifteen years in product and UX. A hundred-plus workshops
run across Europe with startups, scale-ups, and teams inside companies you know. Two years building with
every serious AI tool on the market.
Read more about Marcin.
Contact
Get in touch about Product Build Day. Bring a public day to your city, or commission a private edition for
your team. Based in Europe. Runs in English. Happy to travel.
Contact us or join the city list to hear when a public
date lands near you.