Job Description

BillionToOne is a next-generation molecular diagnostics company dedicated to developing powerful and accurate diagnostic tests that are accessible to all. Our innovative QCT molecular counting technology significantly enhances the resolution of disease detection using cell-free DNA by over a thousandfold. This groundbreaking technology is integral to our product offerings, including one of our flagship products, Unity Complete , the only non-invasive prenatal screen capable of assessing fetal risk for both common recessive conditions and aneuploidies from a single maternal blood sample. Leveraging the same molecular counting technology, we've expanded our impact into oncology in 2023 with a pioneering liquid biopsy test, Northstar , that combines treatment selection with monitoring. To date, over 500,000 patients have benefited from our innovative and precise diagnostic tests , and our Annual Recurring Revenue (ARR) has grown from $0 to $125 million in the last ~4 years.

BillionToOne has successfully raised close to $400 million in funding, with a notable $130 million Series D round completed in June 2024, resulting in a company valuation of over $1 billion. This funding has come from prestigious global institutional investors, including Hummingbird, Adams Street Partners, Neuberger Berman, Baillie Gifford, and Premji Invest. BillionToOne has recently been recognized by Forbes as one of America's Best Startup Employers for 2025 , highlighting the company's exceptional work environment and commitment to innovation.

Our team has grown significantly and despite substantial growth, we have successfully maintained the unique culture that has defined BillionToOne from inception, continuing to cultivate a team that is not only diverse and passionate but also innovative. Headquartered in Menlo Park, California, with an additional facility in Union City, California, BillionToOne remains at the forefront of significant advances in molecular diagnostics, evidenced by the recent announcement of clinical outcomes data for its Unity Fetal Risk Screen and new advancements in cancer diagnostics. For more detailed information about BillionToOne and its groundbreaking work, please visit our website at .

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.
• 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.

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

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This position requires an onsite presence of 2-3 days per week at either our Union City or Menlo Park office. Are you able to meet this requirement? If not, would you consider relocating? *

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