Product Build Day // Reviews 

This is an awesome opportunity for curious people from product, ux, tech and sales and beyond to challenge themselvs. To co-create, build and network. Great mentorship, building and fast-prototyping in Lovable. Testing with synthetic users in Uxia's platform. Just in three hours in total! Go for it!

Purely a developer experience, interaction between different skillset minded people, learning experience in engaged environment and a team collaboration...

Last week, I had the opportunity to participate in the Product Build Day in Berlin, an intense 90-minute challenge where our team transformed a real business case into a working product concept.

A big thank you to the organizers for creating such a fantastic event. The atmosphere was both highly professional and incredibly welcoming, making collaboration easy and enjoyable from the very beginning.

During the challenge, we quickly aligned on the problem, defined the MVP, built a functional prototype using Lovable, and validated our assumptions with Synthetic Users by Uxia. Thanks to a motivated and fast-moving team, we iterated rapidly, improved each version, and ultimately delivered a concept that won the challenge.

What impressed me most was the combination of AI-powered tools and strong teamwork. AI significantly accelerated the entire process, from generating initial ideas to building a working prototype and testing assumptions almost instantly. At the same time, the team remained highly engaged, making quick decisions, refining the product collaboratively, and maintaining momentum throughout the challenge. Synthetic Users by Uxia helped us validate ideas immediately, making our iterations even more effective.

Overall, it was an excellent hands-on experience that demonstrated how efficiently AI can support product development when combined with effective teamwork.

Great workshop leader! Good vibes!

A great hands-on experience

I really enjoyed Product Build Day! We worked in teams to build a product in just 90 minutes and tested our idea with Synthetic Users, which was a new experience for me.

My favourite part was the teamwork: sharing ideas, making decisions together and figuring out what we could realistically deliver in the time available. It was also a great opportunity to meet interesting people and try new tools.

Our team won, which was a nice bonus. I’d happily join again and would recommend it to anyone who enjoys learning by doing.

This was my first time building a product as a team and it was so much fun and super insightful! I learned a lot about how to align on opinions and pitch ideas. Also it was really cool to hear so many different perspectives.

I got a change to learn new things and network with amazing people.

Great time to experiment with new tools that you normally don't have time to use during work.
Nice challenge and great hosting.

It was really good and inspiring event, where everyone is open to try something new for them. In team communication was fun and valuable. Product day also provided free drinks, snacks and subscription for workshops.

Highly recommend for not only building a product, but also an inspiration from people in the room. Using AI makes me feel like the technology is accessible, rather than intimidating. The format is also enjoyable as well as insightful for the learning perspective.

Building from a single prompt to vibe coding, review, presentation, and networking with other builders was a five-star experience.

This was a perfectly organised event with lovely people at a unique location. It was perfect both for the experience gained and the networking. Taking also into consideration that this was completely free, it was definitely one of the best work-related Saturdays. Highly recommended.

Experimenting with new tools, learning better prompting, meeting new people and haning fun

I had an amazing experience at Product Build Day // Warsaw. The event was very well organized, the challenge was engaging, and it was exciting to work with talented people from different backgrounds.

I especially enjoyed stepping outside my usual engineering role and focusing on product thinking while leveraging AI tools to bring ideas to life.

Beyond the competition itself, the opportunity to meet inspiring people, exchange ideas, and learn from others made the day truly valuable.

I had a great experience from start to finish. Everything was smooth, easy to use, and exactly as described. The quality exceeded my expectations, and the customer support team was friendly, responsive, and helpful whenever I had a question. I really appreciate the professionalism and attention to detail. I would definitely use this service again and highly recommend it to others.

The Athens edition of Product Build Day was an intensive and highly rewarding experience that demonstrated how individuals without a coding background can leverage AI tools to transform an idea into a working prototype within a single day. The initiative, originally conceived by Marcin Klimaszewski, brought together participants in a highly collaborative setting.
I particularly valued the opportunity to work in a multidisciplinary team on a real accessibility challenge: identifying user needs, building in Lovable, and testing with users. The emphasis extended beyond product development to validating assumptions, incorporating feedback, and presenting a final solution.
While additional time for user testing and iteration would further strengthen future editions, the overall experience offered an excellent balance of learning, teamwork, creativity, and practical problem-solving.

Marcin and the other mentos were amazing they help us elevate our thoughts and get our end products one step further.
Also the choice of the place as amazing Goulandris Foundation, in an amazing library that we did our great work.
Finally, the people joined all had something to share. All of these things made the experience unforgettable. It’s helped to refine our skills and create a network amazing people.

I attended the Product Build Day in Athens and it exceeded my expectations.
The sessions were practical, well structured and focused on solving real product challenges rather than just presenting theory.
What made the experience stand out was seeing a group of people who had never met before come together around a challenge introduced that same morning. By the afternoon, we had connected, exchanged ideas and co-created something as a team.
Marcin’s organisation was excellent from start to finish. It is an experience I would recommend without hesitation.

Product Builder Day was an inspiring workshop full of energy, collaboration, and great people. Working in small teams, we used AI tools like Lovable and Uxia to go through the entire product design process—from quick research and brainstorming to building, testing, and presenting a prototype.

My biggest takeaway was realizing that creating a product concept doesn't have to take weeks. With the right process, collaboration, and AI tools, it's possible to build meaningful solutions in a very short time—even with a team of people you've just met. Thank you to the organizers for such a well-designed and engaging event!

It was a nice day, got to know new people from the event and had the opportunity to test new tools. Looking forward to the next one.