Zamen is a mobile application which provides a platform for groups of people, to contribute money so that each month one collects the total sum (rotating savings and credit association). It's a centuries-old savings tool and that was the challenge; to design a new experience which can bring this old tool to the mobile apps world. The solution was to give it an experience like groups and group messaging platforms. You create a group of your friends or family members, you can chat with them and also you can define a goal for the group. The goal is to contribute money and win the sum and it's guaranteed that you will get the sum soon or later.