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, 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 highly skilled and experienced Director of Accounting / Associate Controller to join our team.

The Director of Accounting / Associate Controller will be responsible for managing various accounting functions, including inventory and cost accounting, financial reporting, equity & tax accounting processes and procedures. This role will oversee monthly, quarterly, and annual financial reporting, ensuring timely and effective processes and controls in reporting the company's financial position and cash flows. The Director of Accounting / Associate Controller is a hybrid position.

Key Responsibilities:

• Oversee inventory and cost accounting, partnering with Supply Chain to improve processes and ensure accurate financial reporting.
• Manage monthly close, reconciliations, account analysis, and preparation and posting of journal entries.
• Prepare, review, and maintain supporting documentation, performing monthly and quarterly flux analyses of financial accounts and statements.
• Coordinate with outsourced tax providers for accurate tax accounting, quarterly and annual tax projections, and filings.
• Develop strong collaborative relationships with other teams to understand the business and apply that knowledge to financial statements and reporting.
• Work with financial statement auditors to complete quarterly reviews and annual audits, providing necessary documentation and support.
• Assist with Sarbanes-Oxley (SOX) compliance, including the development and documentation of controls and maintenance of effective internal control processes.
• Oversee compliance with company policies and regulations.
• Manage and engage members of the accounting team.
• Assist in management of key system implementations and process improvements.
• Manage and complete special projects as necessary.

Qualifications:

• Bachelor's degree in accounting, finance, or economics
• CPA certification required
• Minimum 12+ years of progressive experience in accounting leadership in a corporate accounting environment combined with public accounting experience
• Big 4 experience preferred
• Experience with NetSuite preferred
• Strong business acumen, critical thinking proficiency, and excellent communication skills
• Deep knowledge and application of US GAAP and SOX 404 regulations and guidelines

Benefits and Perks:

• Working with a team of ‘superstars’ who bring out the best in everyone
• Competitive pay and generous equity package
• 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 $395,250 per year, including a base pay range up to $200,000 - $225,000 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 500,000 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