I was the startup's only Product Designer, which meant owning the MVP's design end-to-end: flows, user journeys, information architecture, all of it. I designed the first versions of concepts that are now the product's core, relationship health scores, predictive churn signals, revenue opportunity prioritization, translating abstract AI ideas into interfaces a family office manager can actually use without a manual. To avoid reinventing basic patterns, I customized Untitled UI as the design system, which gave us fast visual consistency and kept the dev team aligned through short validation cycles. I used Claude as a decision partner for components and interface patterns, and it made a real difference in speed, calls that would've taken hours of exploration moved faster with a solid AI copilot. That freed up time to focus on what actually mattered: understanding how a family office manager thinks before trusting a machine-generated recommendation.