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Senior Software Engineer, Prenatal

United States, Menlo Park Employment contract 190000.00 - 211000.00 USD / Year · Job Posted May 27, 2026
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Job Description

We are currently looking for a high-performing Senior Software Engineer to join our dynamic prenatal 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 working across the full development lifecycle, 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 3 days/week) position.

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% on 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

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