Research Associate Intern

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 an interdisciplinary Research Associate Intern to perform experiments and assays under the guidance of experienced Scientists. The Research Associate intern is an on-site position in our Menlo Park, CA office.

• →Perform experiments and assays under the guidance of experienced Scientists
• →Learn analytical and computational methodologies and analyze the results under the guidance of experienced Scientists
• →Assist experienced Scientists in assay development
• →Keep accurate and meticulous records of experimental details and results
• →Prepare biological samples and reagents to accelerate the R&D process
• →Manage, organize, and support lab operations

• Anticipated undergraduate/masters major in Molecular and Cell Biology, Microbiology, Biophysics, Biochemistry, or related field
• Laboratory research experience
• An ability to quickly learn mathematical, analytical, and experimental concepts
• High mathematical and statistical aptitude (e.g., you find GRE math section to be extremely easy)
• Great attention to detail

• Experience with standard molecular biology techniques relating to DNA such as PCR
• Experience in a cell-free DNA setting
• Experience with next-generation sequencing library preparation
• Experience with computational analysis in R, Python, or other programming language

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