This design process required close collaboration with developers, and we moved fluidly between designing screens and optimizing flows. I outlined a set of usability principles in the early stages to serve as an ongoing reminder not to sacrifice ease of use for less complex technical solutions. Sketches advanced to prototypes, and we added features to improve convenience, such as remembering last-visited stores and enabling mobile reminders. As we wrapped up visual design, we turned our attention beyond our coupon redeemers and looked at the needs of the sales team, creating an educational prototype to help introduce mobile coupons to participating stores.