Ready to redefine what's possible in molecular diagnostics? Join a team of brilliant, passionate innovators determined to transform healthcare. At BillionToOne, we've built a category-defining, publicly traded company on Nasdaq where transparency fuels trust, collaboration drives breakthroughs, and every contribution moves the needle on our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we build products that are 10x better than anything that exists today. Our scientists, engineers, sales executives, and visionaries are united by an unwavering commitment to changing the standard of care in prenatal and cancer diagnostics. This is where cutting-edge science meets human compassion, and every innovation you contribute helps remove the fear of the unknown from some of life's most critical medical moments. If you're driven by purpose, energized by innovation, and ready to help shape the future of precision medicine at scale, this is where you belong. We're seeking an exceptional Lead UX Designer to own the end-to-end experience strategy and execution for our prenatal diagnostic platform, Unity. This role sits at the intersection of cutting-edge genomics and human-centered design - leading the translation of complex molecular diagnostics into seamless, trustworthy experiences that empower clinicians, patients, and operational teams. As a key member of our product team, you'll lead design from strategic insights through final production, applying systems thinking to design across an interconnected healthcare ecosystem that spans lab processes, electronic health records, provider networks, and patient touchpoints. You'll bridge scientific complexity and clinical reality while guiding design team members and elevating the craft of the entire organization. This is a hybrid position (2-3 days per week at our Menlo Park facilities.) Responsibilities: Strategic Design Leadership Own the complete UX vision and strategy for Unity's patient and provider platforms,...