Senior Software Engineer, BillionToOne
Prenatal
$190.1-211.2k
+ Equity
2-3 days a week in office
Precision diagnostics for disease detection
Open for applications
Precision diagnostics for disease detection
501-1000 employees
Open for applications
$190.1-211.2k
+ Equity
2-3 days a week in office
501-1000 employees
Company mission
To make molecular diagnostics more accurate, efficient, and accessible.
Role
Who you are
- 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
- 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 the job involves
- We are currently looking for a high-performing Senior Software Engineer, Prenatal 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
- In this role, you can have an impact both through many small tools and large product development
- Scaling and future-proofing core systems to support rapid volume growth, enterprise workloads, and long-term platform expansion
- Building shared platform libraries and modular, domain-aligned services that reduce coupling, improve maintainability, and enable teams to integrate and deliver independently
- Driving core architectural initiatives including service boundaries, data flows, observability patterns, and modernization of legacy components to enhance reliability and developer velocity
- Establishing foundational infrastructure and automation that strengthens deployment workflows, improves system health visibility, and enables consistent, high-quality engineering execution
- Technologies we use include: Python, Django, Postgres, React, Typescript, AWS, Heroku, Salesforce, and emerging AI-assisted coding environments (e.g., Cursor, GitHub Copilot, Claude Code)
- 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
Our take
BillionToOne is a precision diagnostics company. Its proprietary molecular counting platform (Quantitative Counting Templates) accurately counts DNA molecules at the single-count level, which has the ability to significantly improve disease detection. While initially focused on prenatal screening and oncological liquid biopsies, the company’s QTC technology is highly scalable and has the ability to make vast improvements to a range of disease detection verticals.
The company’s funding efforts - most notably a 2025 IPO - will enable it to focus on further development and commercialisation of its noninvasive prenatal screening test and oncology products. However, it will need to maintain a strategic outlook, prioritising areas with higher testing frequencies to maximise patient benefit and balance test development costs.
BillionToOne has an important role to play in improving healthcare equity. As more promising peer-reviewed research studies are conducted and providers have increased confidence in the company’s tests, BillionToOne has significant growth potential.
Freddie
Company Specialist at Welcome to the Jungle
Insights
32% employee growth in 12 months
Company
Funding (last 2 of 4 rounds)
Dec 2022
$5m
SERIES B
Mar 2022
$21m
SERIES B
Total funding: $43.3m
Company benefits
- Suite of benefit plans
- Paid Medical, Pregnancy, Parental and Family Leaves
- Retirement savings program with Company contribution
- Generous equity package
- Free daily on-site lunches provided from top eateries
- Latest and greatest hardware (laptop, lab equipment, facilities)
- Free on-site EV charging (compatible with all EVs, including Tesla!)
- Working with a team of ‘rockstars’ who bring out the best in everyone
- The ability to indirectly or directly change the lives of hundreds of thousand patients
- Open, transparent culture that includes weekly Town Hall meetings
Company HQ
Menlo Park, CA
Leadership
Oguzhan Atay, PhD
(Co-Founder & CEO)Former Graduate Fellow at Stanford University (Department of Biology). They also spent time as a Researcher at the University of Oxford.
David Tsao
(Co-Founder & CTO)Former Technical Staff Member at Groupon and Software Engineer at Adku. They also worked as an Engineering Intern at Northrop Grumman Aerospace Systems.
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