Lead end-to-end product design for a B2B SaaS platform, from user research and usability testing through wireframes, prototypes, high-fidelity designs, and shipped implementation. Define UX/UI patterns and design systems, collaborate with product managers and engineers, facilitate research and design workshops, develop personas, and contribute to product strategy. The role includes shaping 0-to-1 features, improving existing products, and using AI tools in the design practice.