Process Engineering Intern

Ready to redefine what's possible in molecular diagnostics?

Join a team of brilliant, passionate innovators determined to transform healthcare. At BillionToOne, we've built a category-defining, publicly traded company on Nasdaq where transparency fuels trust, collaboration drives breakthroughs, and every contribution moves the needle on our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we build products that are 10x better than anything that exists today.

With over 700 employees, half a million patients helped, and one of the most successful IPOs in medical diagnostics history behind us, we're just getting started. Our scientists, engineers, sales executives, and visionaries are 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, and every innovation you contribute helps remove the fear of the unknown from some of life's most critical medical moments.

If you're driven by purpose, energized by innovation, and ready to help shape the future of precision medicine at scale, this is where you belong.

We seek a Process Engineering Intern whose academic interests span molecular diagnostics, process optimization and quantitative problem solving. This internship offers an immersive dive into the tools and systems used to develop, monitor and troubleshoot category defining cfDNA-based NIPT assays in a fast paced and rapidly growing biotech. You will build broad expertise spanning molecular techniques, laboratory automation, and data analysis while contributing directly to technology that transforms patient lives one molecule at a time. The Process Engineering Intern is an onsite position at our Union City, CA laboratory and reports to the Senior Development Scientist.

Responsibilities:

• Design, execute, and analyze wet lab experiments to improve process efficiency and assay reliability.
• Evaluate new molecular biology techniques and technologies to enhance assay performance.
• Perform complex manual and automated laboratory procedures (e.g., nucleic acid extraction, PCR, sequencing, reagent preparation).
• Collaborate with the team to analyze complex data, diagnose issues, and implement solutions.
• Maintain a safe and organized lab environment, strictly adhering to all safety and quality protocols.
• Present project progress, data, and technical insights to the team and department.

Qualifications:

• Currently pursuing a Bachelor's or Master's degree in a relevant scientific or engineering discipline (e.g., Bioengineering, Chemical Engineering, Molecular Biology, Biochemistry, Chemistry or Physics).
• Proven experience conducting scientific research within an academic or industrial laboratory environment.
• Prior hands-on experience with core molecular biology techniques (e.g., PCR, DNA/RNA extraction, sequencing).
• Exceptional analytical reasoning and quantitative problem-solving skills, with experience in data analysis using tools like Python or R.
• A driven, creative, and passionate mindset, with a strong willingness to go above and beyond to solve problems.
• Strong communication skills, able to articulate complex data and insights clearly.
• Demonstrated ability to work independently and collaboratively 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 $25 per hour.

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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 has already transformed the lives of over half a million patients worldwide.

Our Impact

Unity Complete™ is the only non-invasive prenatal screen capable of assessing fetal risk for both common recessive conditions and aneuploidies from a single maternal blood sample. 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 $150M+ in Annual Recurring Revenue in just five years. In 2025, we completed one of the most successful IPOs for a medical diagnostics company, building on nearly $400M in private funding,including our $130M Series D in 2024 and backed by world-class investors including Hummingbird, Adams Street Partners, Neuberger Berman, Baillie Gifford, and Premji Invest.

Our Recognition

Forbes named us one of America's Best Startup Employers for 2025 and we're Great Place to Work certified, with 100% of our people willing to go the extra mile, even as we've scaled to over 700 employees.

Our Future

Headquartered in Menlo Park with facilities in Union City, CA, and a new lab opening in Austin, TX in 2027, we're continuing to push the boundaries of what's possible in molecular diagnostics. We're just getting started.

Ready to help us change the world, one molecule at a time? Learn more at billiontoone.com