Lead UX Designer

BillionToOne•Menlo Park, CA

2d•$179,521 - $211,201•Hybrid

About The Position

Ready to redefine what's possible in molecular diagnostics? Join a team of brilliant, passionate innovators who wake up every day determined to transform healthcare. At BillionToOne, we've built something extraordinary—a culture where transparency fuels trust, collaboration drives breakthroughs, and every voice matters in our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we strive to build products that are 10x better than anything that exists today. Our people are our greatest asset: talented scientists, engineers, sales professionals, and visionaries 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—every innovation you contribute helps remove fear of unknown from some of life's most critical medical moments. If you're driven by purpose, energized by innovation, and ready to help build the future of precision medicine, 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.)

Requirements

7–10 years of professional experience in UX, product design, or service design
3+ years in leadership roles with demonstrated ability to own design strategy and guide team members
Proven track record designing in healthcare, biotech, or similarly complex regulated environments
An exceptional portfolio demonstrating systems-level thinking, strategic leadership, and user-centered problem solving from research through final execution
Expert-level skills in design and prototyping tools: Figma, Sketch, Miro, or similar platforms
Deep understanding of user research methodologies, from generative research to usability testing
Mastery of information architecture, interaction design principles, and UX best practices
Strong grasp of accessibility standards (WCAG) and healthcare regulatory requirements (HIPAA, FDA)
Experience creating and maintaining design systems at scale

Nice To Haves

Experience in both B2B and B2C healthcare product contexts preferred
Background working with AI-powered product experiences a plus
Track record of partnering with product management on prioritization and phased delivery approaches

Responsibilities

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
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
Oversee and mentor junior designers and UX contractors, providing clear direction, constructive feedback, and opportunities for growth
Build a culture of design excellence, systems thinking, and user advocacy within the design team and across the organization
Partner with engineers to ensure the experiential quality of what ships matches design intent and maintains high craft standards
Present and defend design decisions to stakeholders across product, clinical, and executive leadership
Collaborate with product managers, engineers, clinicians, and genetic counseling teams to align design work with broader organizational goals
Identify opportunities and drive initiatives independently while maintaining strategic alignment across teams

Benefits

Working alongside brilliant, kind, passionate and dedicated colleagues, in an empowering environment, toward a global vision, striving for a future in which transformative molecular diagnostics can help millions of patients
Open, transparent culture that includes weekly Town Hall meetings
The ability to indirectly or directly change the lives of hundreds of thousands patients
Multiple medical benefit options; employee premiums paid 100% of select plans, dependents covered up to 80%
Extremely generous Family Bonding Leave for new parents (16 weeks, paid at 100%)
Supplemental fertility benefits coverage
Retirement savings program including a 4% Company match
Increase paid time off with increased tenure
Latest and greatest hardware (laptop, lab equipment, facilities)
Daily on-site lunches provided from top eateries
A variety of perks on campus (state of the art gym, restaurant)
Free on-site EV charging (compatible with all EVs, including Tesla)
At BillionToOne, we are proud to offer a combination of a (1) base pay range (actual amount offered is based on experience and salary/equity options split that the candidate chooses), (2) generous equity options offering, (3) corporate bonus program, on top of (4) industry leading company benefits (free healthcare options, 401k match, very generous fully paid parental leave, etc.).
For this position, we offer a total compensation package of $317,881 per year, including a base pay range of $179,521 - $211,201 per year.