Director of Diagnostics (California Medical Groups & IPAs)

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 are seeking an experienced Director of Diagnostics (California Medical Groups & IPAs) to lead strategic initiatives that ensure optimal access and reimbursement for our cutting-edge diagnostic products across California. This individual will focus on engaging with medical groups and Independent Physician Associations (IPAs), leveraging deep expertise in provider networks, reimbursement strategy, and the California healthcare ecosystem.

You will play a critical role in driving adoption of our diagnostics by navigating the complex payer and provider landscape, building strong stakeholder relationships, and aligning internal teams around market access objectives.

Responsibilities:

• Develop and nurture strategic relationships with decision-makers in medical groups, IPAs, and healthcare systems across California.
• Design and implement market access strategies to secure favorable coverage and reimbursement for our diagnostic solutions.
• Partner cross-functionally with Sales, Marketing, Clinical, and Reimbursement teams to align on access and commercialization priorities.
• Articulate the clinical utility and economic value of our diagnostics to healthcare providers and key stakeholders.
• Monitor and interpret legislative, regulatory, and payer policy developments affecting diagnostic access within the state.
• Lead payer engagement, including contract negotiations, coverage submissions, and the development of reimbursement dossiers.
• Provide actionable insights and data to inform pricing, contracting, and access decisions.
• Track competitor market access activities and adapt strategy in a dynamic and competitive environment.

Qualifications:

• Bachelor’s degree in Life Sciences, Healthcare Administration, Business, or a related field; advanced degree preferred.
• Minimum of 5 years’ experience in market access, reimbursement, or healthcare consulting—preferably in diagnostics, biotech, or medical devices.
• Deep knowledge of California’s healthcare delivery system, with specific experience working with medical groups and IPAs.
• Proven track record in payer negotiations and reimbursement strategy execution.
• Exceptional communication, interpersonal, and stakeholder engagement skills.
• Strong analytical skills with the ability to translate complex data into impactful strategies.
• Highly self-driven, well-organized, and capable of working independently in a fast-paced environment.

Benefits And Perks:

• 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)

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 up to $389,090 per year (including equity and at-plan commission, with no cap), including a base pay range of $211,201 - $237,601 per year.

BillionToOne is an equal-opportunity employer. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

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About Billiontoone

BillionToOne is a next-generation molecular diagnostics company on a mission to make powerful, accurate diagnostic tests accessible to everyone. Our revolutionary QCT molecular counting technology enhances disease detection resolution by over a thousandfold using cell-free DNA—a breakthrough that's already transformed the lives of over half a million patients worldwide.

Our Impact: We've pioneered game-changing diagnostic solutions that are redefining industry standards. Unity Complete™ stands as the only non-invasive prenatal screen capable of assessing fetal risk for both common recessive conditions and aneuploidies from a single maternal blood sample. In oncology, our Northstar® liquid biopsy test uniquely combines treatment selection with real-time monitoring, giving oncologists unprecedented precision in cancer care.

Our Growth: From $0 to $125 million in Annual Recurring Revenue in just four years. We've raised close to $400 million in funding, including a $130 million Series D round in June 2024, achieving a valuation of over $1 billion. This backing comes from world-class investors including Hummingbird, Adams Street Partners, Neuberger Berman, Baillie Gifford, and Premji Invest.

Our Recognition: Forbes recently named us one of America's Best Startup Employers for 2025, and we were awarded Great Place to Work certification in 2024—with an incredible 100% of our people reporting they are willing to give extra to get the job done. These honors recognize not just our innovation but the exceptional culture we've cultivated—one that remains authentically collaborative and transparent even as we've scaled.

Our Future: Headquartered in Menlo Park with facilities in Union City, California, we're continuing to push the boundaries of what's possible in molecular diagnostics. Recent clinical outcomes data for Unity Fetal Risk Screen and new advances in cancer diagnostics prove we're just getting started.

At BillionToOne, you'll join a diverse team of passionate innovators who believe that the best science happens when brilliant minds collaborate openly, think boldly, and never lose sight of the patients whose lives depend on our work.

Ready to help us change the world, one diagnosis at a time?

Learn more at www.billiontoone.com