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 an Associate Director of People Operations to join our dynamic team. In this pivotal role, you will support the HR function by aligning closely with our Senior Director of People Operations. Together, you will develop and execute strategies to create a competitive advantage for our employee experience, enhancing the workplace as our company scales. The ideal candidate has experience managing multiple People Ops functions as the first People Ops/HR member of the team through high growth exceeding 600 employees, while managing day-to-day operations, enhancing employee experience with impactful programs, and contributing to a thriving culture. The Associate Director of People Operations is a hybrid position (onsite 2-3 days/week) and reports to the Senior Director of People Operations.

Responsibilities:

• Partner with the Senior Director of People Operations to design and implement HR strategies that align with business objectives and foster employee engagement.
• Oversee day-to-day People Operations functions including performance management, employee relations, and employee engagement.
• Develop and implement practices to enhance organizational effectiveness and ensure continuous improvement in HR processes.
• Collaborate with cross-functional teams to support company-wide initiatives and promote a seamless employee experience.
• Lead and mentor a team of HR professionals, ensuring professional development and effectiveness.
• Manage compliance with local, state, and federal employment laws and regulations.
• Measure and track key HR metrics to assess the efficacy of HR initiatives and make informed decisions.
• Drive initiatives that create an inclusive and diverse workplace, promoting the company's values and culture.

Qualifications:

• Bachelor’s degree in Human Resources, Business Administration, or a related field.
• A minimum of 7-10 years’ experience in HR, with proven experience in at least one leadership role.
• Strong passion for creating an inclusive and engaging workplace culture.
• Thorough knowledge of HR best practices and knowledge of employment laws and regulations.
• Excellent leadership skills with the ability to influence and drive change across the organization.
• Exceptional communication and interpersonal skills, with the ability to build relationships and collaborate effectively across all levels of the organization.
• Demonstrates exceptional ability to coach people managers, empowering them with skills and confidence to effectively support their teams.
• Proven experience in developing and executing innovative and impactful HR strategies in a growing company.

Benefits And Perks:

• Working alongside brilliant, kind, passionate and dedicated colleagues, in an empowering environment, toward a global vision, striving for a future in which transformative molecular diagnostics can help millions of patients
• Open, transparent culture that includes weekly Town Hall meetings
• The ability to indirectly or directly change the lives of hundreds of thousands patients
• Multiple medical benefit options; employee premiums paid 100% of select plans, dependents covered up to 80%
• Extremely generous Family Bonding Leave for new parents (16 weeks, paid at 100%)
• Free UNITY Complete NIPT testing for employees & spouses
• Supplemental fertility benefits coverage
• Retirement savings program including a 4% Company match
• Increase paid time off with increased tenure
• Latest and greatest hardware (laptop, lab equipment, facilities)
• Free daily on-site lunches provided from top eateries
• 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 up to $324,042 per year, including a base pay range of $187,272 - $208,080 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