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Senior Software Engineer, Digital Experience

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BillionToOne

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Location:
United States , Menlo Park

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Contract Type:
Not provided

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Salary:

190081.00 - 211201.00 USD / Year

Job Description:

We are currently looking for a high-performing Senior Software Engineer, Digital Experience to join our dynamic software engineering team. Software engineers at BillionToOne work in highly collaborative and interdisciplinary teams of clinicians, computational biologists, and other engineers to robustly scale personalized genomic medicine to millions of patients. If you have experience performing in a full life-cycle development, love seeing your work positively affect your colleagues and patients, and thrive in a fast-paced entrepreneurial environment, this could be a great opportunity for you. In this role, you can have an impact both through many small tools and large product development. This role is a hybrid (onsite 2-3 days/week) position.

Job Responsibility:

  • 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, contributing to the growth and development of colleagues through mentorship and collaborative learning
  • Demonstrate a creative and out-of-the-box mindset, offering innovative solutions and approaches to complex technical challenges
  • Prioritize quality by writing comprehensive unit tests and ensuring adequate test coverage across all components and modules
  • Demonstrate a strong sense of ownership and take responsibility for end-to-end project delivery. The ideal candidate will thrive in an environment where they have the autonomy to make informed decisions and take the initiative to drive projects forward
  • Champion engineering excellence through architectural best practices, code quality standards, and thoughtful code reviews that emphasize both functionality and security
  • Apply a security and compliance mindset ensuring adherence to relevant regulations while implementing appropriate safeguards for sensitive patient information
  • Confidently challenge ideas and assumptions from stakeholders when necessary, while at the same time, leverage their expertise and insights to improve the overall solution

Requirements:

  • 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
  • Have 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

Nice to have:

  • Previous startup or entrepreneurial experience
  • Experience in driving products from zero to one
  • Familiarity with healthcare data and standards like FHIR and HL7
  • Interest in engaging with and applying LLMs
What we offer:
  • 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%)
  • 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)
  • Generous equity options offering
  • Corporate bonus program

Additional Information:

Job Posted:
January 23, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
Job Link Share:

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