Founder of Product Build Day and a 15-year product and UX veteran who helps teams make confident product decisions in record time. A former head of UX who has worked with cross-functional teams across over five European countries, Marcin operates on a simple, uncompromising principle: an idea that cannot survive a single day is not worth a quarter.
Through Product Build Days, run across Poland, Greece, the Netherlands, Sweden, Denmark and Germany, Marcin helps founders and product leaders compress weeks of hypothetical debates into a single day.
By writing ideas in one sentence, designing cheap tests, "vibe coding" rapid prototypes and running synthetic user testing, he helps teams decide whether to double down or kill an idea before wasting months of dev budget.
Catch Marcin live at How to Web Conference to steal his exact workflow for testing and deciding on product ideas in an afternoon.