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 seeking a Senior Development Associate, Automation – Oncology to join our dynamic Oncology Development team. As a key technical contributor, you will support the development and optimization of assays and automation processes to scale our high-complexity and high-growth clinical laboratory for groundbreaking oncology tests. You will work closely with interdisciplinary teams to implement and refine processes that integrate chemistry changes,, liquid handling automation, and algorithm refinement, contributing to the advancement and scalability of our oncology diagnostics products. This role is primarily onsite at our Menlo Park location and reports to the Sr. Automation Scientist, Development, Oncology.

Responsibilities:

• Support the development and optimization of molecular biology processes for larger-scale oncology diagnostics products in the development pipeline.
• Collaborate with Research, bioinformatics, process engineering, and CLIA teams to implement solutions that integrate into product development workflows and production facilities.
• Contribute to the development and implementation of automation solutions for new assays and diagnostic features.
• Assist with data analysis and bioinformatics tasks to support test development and refinement, ensuring accuracy and precision.
• Work as part of an interdisciplinary team to help develop scalable diagnostic tests.
• Maintain comprehensive documentation, including experimental designs, process optimizations, validations, and standard operating procedures.
• Present updates on assigned tasks and project progress to team members and management.

Requirements:

• Bachelor’s or Master’s degree (preferred) in Chemistry, Engineering, Biophysics, Biochemistry, Bioengineering, or a related field.
• Strong skills in statistical and first-principle thinking.
• 1–3 years of experience in a research or industry setting, preferably with exposure to automation engineering or process development.
• Experience with liquid handling systems (Agilent Bravo, Hamilton STAR, Biomek, etc.) and/or next-generation sequencing technologies is a plus.
• Proficiency in coding languages such as Python, Java, and strong data analysis skills.
• Excellent analytical and communication skills, with the ability to clearly convey scientific and engineering concepts.
• Ability to collaborate effectively with others within the team and across different teams.

Nice-to-Haves:

• Molecular biology/nucleic acid chemistry experience.
• Background in bioinformatics.
• Experience working in regulated environments (CLIA, CAP, FDA).
• Experience with laboratory information management systems (LIMS).

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
• Multiple medical benefit options; employee premiums paid 100% of select plans, dependents covered at 80%
• Extremely generous Family Bonding Leave for new parents (16 weeks, paid at 100%)
• Retirement savings program including a 4% Company match
• 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 a (1) base pay range (actual amount offered is based on experience and salary/equity options split that the candidate chooses), (2) generous equity options offering, (3) corporate bonus program, on top of (4) industry leading company benefits (free healthcare options, 401k match, very generous fully paid parental leave, etc.).

For this position, we offer a total compensation package of $112,750 per year, including a base pay range of $83,232 - $93,636 per year.

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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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