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Senior Software Engineer, Prenatal

billiontoone.com Logo

BillionToOne

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Location:
United States , Menlo Park

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

190081.00 - 211201.00 USD / Year
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Job Description:

Ready to redefine what's possible in molecular diagnostics? Join a team of brilliant, passionate innovators who wake up every day determined to transform healthcare. At BillionToOne, we've built something extraordinary—a culture where transparency fuels trust, collaboration drives breakthroughs, and every voice matters in our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we strive to build products that are 10x better than anything that exists today. Our people are our greatest asset: talented scientists, engineers, sales professionals, and visionaries 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—every innovation you contribute helps remove fear of unknown from some of life's most critical medical moments. If you're driven by purpose, energized by innovation, and ready to help build the future of precision medicine, this is where you belong.

Job Responsibility:

  • Design, build, and operate scalable, high availability backend services, APIs, and data integrations that power customer facing product experiences
  • Lead technical delivery across the full lifecycle: architecture, design, implementation, testing, deployment, and ongoing operations
  • Collaborate closely with product, design, and cross functional engineering teams to deliver performant, reliable, and intuitive platform capabilities
  • Develop clean abstractions and platform APIs that simplify complex LIS workflows while balancing developer velocity with long term system stability
  • Build and maintain secure, reliable cloud infrastructure on AWS, including compute environments, networking, container orchestration, storage, and environment automation
  • Implement CI/CD pipelines, Infrastructure as Code, configuration management, and automated environment provisioning to standardize and accelerate delivery
  • Embed observability and operational excellence into the platform by default through robust monitoring, logging, alerting, and reliability patterns
  • Ensure the scalability, maintainability, and overall health of backend and cloud systems as the platform grows to support large enterprise workloads and future global expansion
  • Foster a culture of ownership, technical excellence, learning, and continuous improvement within the engineering team
  • Apply AI-assisted tooling and workflows to improve developer productivity, automate routine engineering tasks, enhance code quality, and accelerate troubleshooting

Requirements:

  • 5 - 7 years of professional software development experience with a proven track record of delivering complex projects adhering to best practices
  • Deep understanding and experience using web frameworks like Django and FastAPI
  • Strong system design and architecture capabilities, applying domain-driven design to translate complex business domains into clear, scalable service and data boundaries.
  • Familiarity with modern AI-driven development practices and tools.
  • Strong foundation in cloud services, preferably AWS, including ECS, S3, AWS Batch, EC2, and AWS Lambda, enabling effective architecture and management of complex systems
  • Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
  • Excited about working in-person with our team in Menlo Park
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)
  • 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)
  • generous equity options offering
  • corporate bonus program

Additional Information:

Job Posted:
December 26, 2025

Employment Type:
Fulltime
Work Type:
Hybrid work
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