Accessioner, Prenatal (Part-Time)

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 detail oriented Accessioner (Part-Time) to be responsible for assisting with the day-to-day laboratory preparation and equipment maintenance in the Clinical Laboratory. The Accessioner will also be responsible for the accessioning of clinical specimens, performing quality assurance procedures, and complying with all local, state, and federal laboratory requirements. The nature of the work performed by an Accessioner requires excellent attention to detail, effective written and verbal communication skills, the ability to multitask, and the ability to work both independently and in a team environment.

This is a part time position (24 hours/week maximum) with Saturday 8am-4:30pm required. 

• →Perform sample accessioning procedures according to the laboratory’s standard operating procedures
• →Prepare documents for equipment and personnel records
• →Perform and document routine maintenance of equipment
• →Prepare other clinical documentation as required and assigned
• →Clean labware, equipment, and benches
• →Prepare reagents required for testing
• →Write and review controlled documents as assigned

• Bachelor’s degree or equivalent in biology-adjacent field, or student currently pursuing biology degree
• Able to integrate and apply feedback in a professional manner
• Strong attention to detail
• Able to manage daily specimen processing needs with high emphasis on quality
• Able to analyze and problem solve basic issues that impact test performance
• Able to proactively communicate consistently, clearly, and honestly

• Clinical Laboratory experience or equivalent high complexity and volume laboratory experience
• Laboratory experience within the last year preferred

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