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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)