Like many start-up founders, the team at Caeli had a never-ending to-do list that didn't allow them to focus on priorities. During the first day of the Design Sprint, we aligned the team on one-year goals and identified the main challenge threatening the company's growth: customer knowledge. After a year in the market, they struggled understanding why customers chose them and which products should they offer next. In the next two days, a prototype to get recurrent feedback was built and tested. We scheduled interviews with potential clients and in a month the team had the insights to create their user personas. Now they are co-creating with customers their first product.