Lead UX Designer

A Rare Opportunity to Shape the Future of Genomics 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, from research insights through final implementation Partner with product leadership to shape roadmaps, define priorities, and determine phased approaches that balance user needs, technical feasibility, and business goals Apply systems thinking to visualize and simplify complex relationships between patients, providers, lab processes, payer requirements, and data systems Transform scientific complexity into intuitive digital experiences that build trust and understanding Translate product strategy into actionable design initiatives that connect user journeys with clinical workflow realities End to End Design Execution Lead the complete design process from discovery and research through wireframing, prototyping, user testing, and final production-ready deliverables Create and maintain high-quality design artifacts: user flows, journey maps, wireframes, prototypes, and design system components that capture the full patient and clinician experience Own in-product microcopy and content strategy, ensuring every word builds clarity, confidence, and trust Drive the evolution of Unity's design system, promoting consistency, scalability, and craft in partnership with branding and marketing teams Ensure accessibility, regulatory compliance, and ethical considerations are integrated into every design decision Lead user research initiatives to uncover insights that drive product strategy and design decisions Advocate for evidence-based design grounded in rigorous user research and testing methodologies Synthesize insights from clinicians, patients, and operational teams to identify unmet needs and design opportunities Champion the user perspective in cross-functional discussions, balancing clinical requirements, technical constraints, and business objectives Team Leadership and Collaboration Oversee and mentor junior designers and UX contractors, providing clear direction, constructive feedback, and opportunities for growth Build a culture of…