Do you want to help bring prenatal diagnostics into clinical practice and improve lives of millions of expecting parents?

BillionToOne (Y Combinator S17) has developed a molecular counter that improves cell-free DNA diagnostics resolution by 1000x. This allows us to revolutionize multiple fields, from prenatal testing to oncology. With our first flagship UNITY and UNITY Complete prenatal tests, we have grown our sample volume by more than 300% even during the pandemic. We have recently built a 10x larger, state-of-the-art clinical laboratory that can scale with our growth.

BillionToOne has developed noninvasive prenatal tests for the most common genetic disorders in the world. More than 100 million people are carriers for these disorders. The prenatal detection of these disorders currently requires invasive methods with high miscarriage risk, but we have developed tests that solve this important problem.

BillionToOne has raised more than $85M in funding from global institutional investors, including from Hummingbird Ventures and Neotribe Ventures, and was listed as one of the top Y Combinator companies.

We are looking 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™ and UNITY™ Complete.  The Medical Science Liaison (MSL) is a remote position.


  • Serve as a key liaison to health care providers (HCPs)
  • Serve as a key member of the BTO 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 BTO products
  • Respond to HCP customer inquiries to provide focused and balanced clinical and scientific information that supports the appropriate use of or clinically differentiates BTOs 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
  • Minimum of 3 years of direct patient care experience in the prenatal setting
  • Expertise in discussing scientific content and context to multiple audiences
  • Excellent communication and interpersonal skills
  • Ability to travel (up to 70%) – percentage varies with geography

Benefits and Perks:

  • Suite of benefit plans
  • Paid Medical, Pregnancy, Parental and Family Leaves
  • Retirement savings program with Company contribution
  • Competitive pay
  • Generous equity package
  • Latest and greatest hardware (laptop, lab equipment, facilities)
  • Working with a team of ‘rockstars’ who bring out the best in everyone
  • The ability to indirectly or directly change the lives of hundreds of thousand patients
  • Open, transparent culture that includes weekly Town Hall meetings

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

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