Medical Science Liaison (MSL), Prenatal

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 are looking for a field-based professional Medical Science Liaison (MSL) with scientific and clinical expertise in the space of prenatal genetic testing. The Medical Science Liaison (MSL) is responsible for providing medical and scientific support for BillionToOne's marketed products UNITY™ Complete. The Medical Science Liaison (MSL) is a remote position.

Travel Requirements: Ideal candidate will have the ability to travel up to 70% nationwide

• →Serve as a key liaison to health care providers (HCPs)
• →Serve as a key member of the BillionToOne Medical Affairs team
• →Develop relationships by engaging in scientific exchange with medical and scientific partners
• →Support commercial team by providing impactful information that enhances the value and proper use of BillionToOne products
• →Respond to HCP customer inquiries to provide focused and balanced clinical and scientific information that supports the appropriate use of BillionToOne’s prenatal products
• →Provide education regarding the clinical differentiation of BillionToOne's products and services
• →Contribute to development of provider and patient educational products
• →Adhere to internal standard processes and comply with regulatory and compliance requirements

• Master’s degree in Genetic Counseling
• Board certified ABGC or ABMG
• 3-5 years of prenatal clinical and/or industry experience in related field required 
• Expertise in discussing scientific content and context to multiple audiences
• Excellent communication, presentation and interpersonal skills
• Ability to travel (up to 70%) – percentage varies with geography

• Bilingual in English and Spanish is a plus, but not required

Unity Complete™ is the only non-invasive prenatal screen capable of assessing fetal risk for both common recessive conditions and aneuploidies from a single maternal blood sample. Our Northstar® liquid biopsy test uniquely combines treatment selection with real-time monitoring, giving oncologists unprecedented precision in cancer care.

From $0 to $150M+ in Annual Recurring Revenue in just five years. In 2025, we completed one of the most successful IPOs for a medical diagnostics company, building on nearly $400M in private funding,including our $130M Series D in 2024 and backed by world-class investors including Hummingbird, Adams Street Partners, Neuberger Berman, Baillie Gifford, and Premji Invest.

Forbes named us one of America's Best Startup Employers for 2025 and we're Great Place to Work certified, with 100% of our people willing to go the extra mile, even as we've scaled to over 700 employees.

Headquartered in Menlo Park with facilities in Union City, CA, and a new lab opening in Austin, TX in 2027, we're continuing to push the boundaries of what's possible in molecular diagnostics. We're just getting started.

Ready to help us change the world, one molecule at a time? Learn more at billiontoone.com