BillionToOne is looking to transform healthcare by making life-changing diagnostics accessible to all, specifically in prenatal and cancer diagnostics, and is seeking a Senior Software Engineer to help build the future of precision medicine
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
- Experience with Python, Django, Postgres, React, Typescript, AWS, Heroku, Salesforce, and emerging AI-assisted coding environments (e.g., Cursor, GitHub Copilot, Claude Code)
Responsibilities
- 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
Other
- Excited about working in-person with our team in Menlo Park
- Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
- Bachelor's degree or higher in Computer Science or related field
- Ability to work in a fast-paced entrepreneurial environment
- Commitment to changing the standard of care in prenatal and cancer diagnostics
