We seek a Process Engineering Associate II whose interests span molecular diagnostics, process optimization, and quantitative problem solving. In this role you will (1) drive process improvement and development to enhance clinical assay performance, (2) support technology transfer from R&D into our high-throughput CLIA lab, and (3) troubleshoot and identify root causes of recurring errors to enable long-term corrective actions. You will also play a key role in standing up our newly built lab in Austin, TX. You will leverage and deepen your expertise across molecular techniques, laboratory automation, and data analysis while contributing directly to category-defining NIPT assays that transform patient lives one molecule at a time. This onsite position starts at our Union City, CA laboratory and will relocate to Austin, TX in summer 2027. The Process Engineering Associate II reports to the Senior Development Scientist.

Austin Expansion Update:
We are building a brand-new state-of-the-art laboratory in Austin, Texas, expected to launch in late 2027 / early 2028, and we are looking for talented laboratory professionals who want to be part of this journey from the very beginning.

Candidates hired into this role will initially relocate to the Bay Area (Union City, CA) to train and work alongside our experienced laboratory teams. During this time (up to ~18 months), you will gain deep hands-on experience with BillionToOne's cutting-edge molecular diagnostic workflows, quality systems, and laboratory operations before transitioning to our new Austin facility once it opens.

This is a unique opportunity to gain hands-on training with our experienced lab teams and become one of the founding members of our Austin laboratory.

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).
• Conduct assay validation studies to qualify new and improved assays for clinical use at both sites.
• Build data analysis and software tools to monitor process health, surface sources of error, and accelerate troubleshooting.
• Collaborate with the team to analyze complex data, diagnose issues, and implement solutions.
• Support technology transfer to our new Austin, TX CLIA lab to bring the new site online.
• Present project progress, data, and technical insights to the team and department.

Qualifications:

• BS or MS in a relevant scientific or engineering discipline (e.g., Bioengineering, Chemical Engineering, Molecular Biology, Biochemistry, Chemistry, or Physics).
• At least 1 year of hands-on lab research experience, including core molecular biology techniques (e.g., PCR, DNA/RNA extraction, sequencing).
• Exceptional analytical reasoning and troubleshooting skills, with experience in data analysis (bioinformatics, statistical analysis, or similar) and comfort using modern AI tools.
• Strong mathematical and statistical aptitude, with a process- and systems-level mindset.
• Excellent attention to detail and clear written and verbal communication.
• Driven, creative, and persistent, with a willingness to go above and beyond and to work both independently and collaboratively in a fast-paced environment.
• Willingness to relocate from Union City, CA to Austin, TX in summer 2027.

Nice-to-haves:

• Start-up experience.
• Previous automation or clinical laboratory experience.
• Experience with next-generation sequencing (NGS) and library preparation.
• Experience in a cell-free DNA setting.
• Prior experience with technology transfer, assay validation, or new lab/site standup.

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 of $104,322 per year, including a base pay range of $75,029 - $85,748 per year.