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 highly motivated Data Science + AI Intern to support BillionToOne’s efforts in scaling and automating critical data processes using AI. This internship is ideal for someone with a background in Data Science/Data Engineering/AI and an interest in applying AI-driven solutions to optimize sales operations, laboratory operations, customer support, and billing systems.Be part of a high-performing team on the cutting edge of prenatal and oncology diagnostics, working in a dynamic startup culture within a public company that is committed to changing the lives of hundreds of thousands of patients.

Responsibilities:

• Work with stakeholder teams to develop and implement AI-driven automation solutions for scaling sales operations, lab operations, customer support, and billing processes.
• Assist in building and maintaining scalable data pipelines to support analytics and machine learning initiatives.
• Optimize data workflows by integrating AI models to improve efficiency and decision-making.
• Collaborate with cross-functional teams, including engineering, operations, and business teams, to understand requirements and propose data-driven solutions.  
• Ensure data integrity, security, and compliance with industry best practices.  
• Document technical processes and provide insights based on analysis and implementation.

Qualifications:  

• Currently pursuing a degree in Data Science, Computer Science, or a related field. College graduates are not eligible.
• Experience with Cursor, Claude Code, or other AI enabled IDEs is plus.
• Strong understanding of data engineering concepts, including ETL pipelines, database management, and cloud computing (e.g. Stitch, dbt).
• Experience with SQL, Python, and big data technologies
• Experience validating non-deterministic AI automation solutions 
• Familiarity with machine learning and AI frameworks (e.g., TensorFlow, PyTorch, Scikit-learn) is a plus.  
• Experience with data visualization (Tableau) is a plus.
• Experience working with AWS cloud platform and data pipeline tools is a plus.  
• Strong problem-solving skills, analytical mindset, and ability to work in a fast-paced environment.  

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: $4,333 per month.

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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