Do you want to join one of the fastest-growing molecular diagnostics startups and be a pioneer for an industry-leader who is impacting the lives of millions?

BillionToOne, ranked at the top 5% of Y Combinator companies with $300M+ in funding from prominent VC firms, has developed a DNA molecular counter that increases cfDNA diagnostic resolution by over 1,000 fold. BillionToOne's first product, UNITY™ is the first and only non-invasive prenatal test that can directly screen an unborn baby's risk for common and severe recessive gene disorders and chromosomal abnormalities, as well as fetal sex and fetal antigens, from a single tube of blood from the pregnant mother without paternal testing.

In 2023, BillionToOne launched two liquid biopsy products that will markedly improve oncology treatment and care. With Northstar Select™, clinicians will be able to select cancer therapies that will be most effective to each patient based on their individual genetic makeup. Northstar Response™ will enable clinicians to monitor a patient’s early response to these cancer therapies, by measuring minute changes in their ctDNA, which can reduce ineffective treatments and unwanted toxicity, lower costs, and substantially improve clinical outcomes.

We are looking for a Reagent Manufacturing Associate II, Oncology to join our growing superstar Oncology team responsible for producing molecular reagents used internally in our high throughput CLIA lab for patient testing. The RMA II is responsible for working independently to make medium to high complexity reagents following established manufacturing protocols, contributing to production assignments and tasks with high quality and timely output. This full-time position requires a presence in both our Menlo Park and Union City locations.


  • Manufacture medium and high complexity reagents in a molecular manufacturing lab according to established SOPs.
  • Operation of robotic laboratory equipment and traditional lab equipment (micropipettes, liquid handlers, thermal cyclers, centrifuges, sealers, sonicator, etc.)
  • Use of traditional molecular biology processes and techniques (small volume pipetting, plating, quantitation, visual inspection)
  • Maintaining thorough, accurate and detailed documentation of all work produced, including deviations
  • Inventory management
  • Collaborate with Research and Development for the scale-up and implementation of new reagent formulations.
  • Participate in reagent troubleshooting and quality monitoring
  • Lab maintenance such as labware cleaning and equipment maintenance as needed
  • Daily completion of assigned tasks to keep manufacturing on track
  • Reagent manufacturing will primarily be operating out of Menlo Park but may require some flexibility to work out of the Union City location 


  • Bachelor’s degree or equivalent degree in biology, chemistry, or clinical related sciences
  • At least one year of experience with molecular biology techniques in a research or clinical laboratory
  • Excellent attention to detail
  • Effective written and verbal communication skills
  • The ability to multitask and work independently
  • Patience and flexibility
  • Previous clinical laboratory experience is preferred


  • Start-up experience
  • Knowledge of medical genetics
  • Experience in a cell-free DNA setting

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 thousands patients
  • Multiple medical benefit options; employee premiums paid 100% of select plans, dependents covered at 80%
  • Extremely generous Family Bonding Leave for new parents (16 weeks, paid at 100%)
  • Retirement savings program including a 4% Company match
  • 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, (2) the opportunity for professional growth, and (3) industry leading company benefits (free healthcare options, 401k match, very generous fully paid parental leave etc.).

For this position, the base pay range is: $70,000-$80,000 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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