Indonesia has more than 250 million people, with half of them living on less than US$2.5 a day1, and approximately 66 percent ‘unbanked’2. Our client, one of the state-owned banks, wanted to help people save their money in the bank so they can have access to financial assistance. In this article, we will share lessons learned from experience prototyping the solution with the client to target this segment of the population.