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Senior Software Engineer, Digital Experiences (Prenatal)

BillionToOne· Engineering
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Menlo Park, CA$190.1k - $211.2kFull-timePosted 8mo ago

About the role

Senior Software Engineer role at BillionToOne focused on building digital experiences for prenatal healthcare, collaborating with clinicians and engineers, in a hybrid in-person/onsite setting in Menlo Park. Role emphasizes full-stack development using React, TypeScript, Django, Postgres, and AWS to scale genomic medicine and improve obstetric care.

Responsibilities

  • Build and maintain robust applications and systems using React, Typescript, Django, Postgres, and other libraries.
  • Collaborate with product design and product management to deliver delightful experiences for patients and providers.
  • Foster a knowledge sharing culture within the team, mentoring colleagues.
  • Demonstrate creative problem solving for complex technical challenges.
  • Prioritize quality with comprehensive unit tests and test coverage.
  • Own end-to-end project delivery with autonomy to drive initiatives.
  • Champion engineering excellence through architecture, code quality, and reviews.
  • Apply security and compliance mindset to protect patient information.
  • Challenge ideas when necessary while leveraging expertise to improve solutions.

Qualifications

  • 5+ years of professional software development experience with a proven track record of delivering complex projects and adhering to best practices
  • Deep experience with modern frontend technologies, specifically with Typescript, React, and CSS-in-JS libraries
  • Implemented frontend architecture best practices such as component systems, npm workspaces, Storybook, and Playwright testing
  • Experience with web frameworks such as Django
  • Familiarity with modern AI-driven development practices and tools
  • Excited about working in-person with our team in Menlo Park

Skills

Required:ReactTypescriptDjangoPostgresAWSSecurity & complianceQA / Testing
Nice to have:AI-driven development practices

Benefits

  • 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%)
  • 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)
  • 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)
  • Open, transparent culture with weekly Town Hall meetings
  • Compensation package including base pay, equity, bonus, and benefits (total compensation: $297,321/year; base $190,081 - $211,201)
Last updated Oct 7, 2026. Interested? Apply on the company site.
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About BillionToOne

The genetic testing platform detecting and measuring disease.

BillionToOne has developed a DNA molecular counter that increases the cell-free DNA diagnostics resolution by over 1,000 fold, which unlocks transformative improvements in prenatal screening and liquid biopsy for cancers. Unity Screen, BillionToOne's commercially available non-invasive prenatal test (NIPT), is the only NIPT that can assess fetal risk for both recessive conditions and aneuploidies from maternal blood. UNITY Screen continues to grow exponentially and is on its path to becoming the next standard-of-care, with an increasing number of publications showing its accuracy and advantages over other screening methods. We have also recently used our molecular counting technology to develop liquid biopsy tests, which have the potential to completely transform oncology care.

diagnosticsgenomics

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