I used human-centered design techniques to design an online service platform for collaborative wholesale purchasing from the ground up. I uncovered unmet needs and market opportunities by conducting dozens of research activities, from contextual inquiry to storyboarding. I iteratively designed user flows, wireframes, and hi-fi mockups, and collaborated with our engineers from initial prototypes through QA. I worked closely with our CEO, business stakeholders, and engineers to champion human-centered design. Our platform launched with a billion dollar client.