Upon joining the team, I found the project already in progress and my colleagues testing three interface concepts with a rudimentary physical prototype. The tests, divided into three usability sessions, aimed to validate design improvements for different user types and task clarity. Over four weeks, around forty diverse users engaged in independent tasks across interfaces, recorded by eye tracking. We tracked metrics like success, errors, time, and satisfaction, assessing the effectiveness of each concept. After a thorough review, we integrated the top features into the final flow and reworked the overall UX.

Post-testing, we overhauled the initial navigation, incorporating feedback. Navigation was meticulously crafted, ensuring users move seamlessly through functions, preventing omissions or erroneous paths. This phase focused on validating user-machine interactions across choice points and actions in various scenarios. Early attention was given to full screen production, determining required assets and animated elements. These encompass beverage selection, brewing, alerts, setup, preferences, and statistics.