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 looking for a detail oriented Accessioner 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 be flexible with scheduling, and the ability to work both independently and in a team environment.

Shift: Flexible schedule, part-time role (24 hours/week max), Saturdays 8:00 am - 4:30 pm required

Responsibilities:

• Perform specimen receipt and accessioning according to the laboratory’s standard operating procedures
• Maintain equipment according to the laboratory’s standard operating procedures
• Clean labware, equipment, and benches
• Prepare documents and binders for equipment and personnel records
• Document all corrective actions taken when test systems deviate from the established performance specifications
• Perform and document routine preventative maintenance
• Prepare reagents required for laboratory preparation
• Communicate effectively with coworkers and non- laboratory personnel
• Report all concerns of accessioning quality and/or safety to the Laboratory Director, Supervisor, or Safety Officer
• Participate in inspection preparation activities
• Review of controlled documents as assigned
• Participate in the training of new accessioning personnel on current procedures including the following:
• Provide hands-on training
• Provide guidance, feedback, and mentorship while respecting various learning styles
• Ensure appropriate documentation is reviewed and completed
• Participate in training meetings
• Prioritize a positive work environment
• Exhibit a dedication to team work above and beyond scheduled daily work
• Participate in projects and process improvements for sample receipt and accessioning

Requirements:

• Student in pursuit of a Bachelor's Biology degree or related life sciences degree
• Laboratory experience within the last year preferred
• 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
• Strong computer skills preferred
• Able to proactively communicate consistently, clearly, and honestly
• One year of Clinical Laboratory experience or equivalent high complexity and volume laboratory experience preferred

Nice-To-Haves:

• Start-up experience
• Bachelor’s degree 

Benefits And Perks:

• Working with a team of ‘rockstars’ who bring out the best in everyone
• Open, transparent culture that includes weekly Town Hall meetings
• The ability to indirectly or directly change the lives of hundreds of thousand patients
• Free daily on-site lunches provided from top eateries
• Latest and greatest hardware (laptop, lab equipment, facilities)
• A variety of perks on campus (state of the art gym, restaurant)
• Free on-site EV charging (compatible with all EVs, including Tesla)

At BillionToOne, we are proud to offer a combination of (1) competitive base pay and (2) the opportunity for professional growth.

For this position, the base pay rate is $20.80 per hour.

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.

For more information about how we protect your information, we encourage you to review our Privacy Policy.

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