Senior Software Engineer (Digital Experiences)

• We are currently looking for a high-performing Senior Software Engineer 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
• 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
• In this role, you can have an impact both through many small tools and large product development
• Build a seamless digital experience so clinicians and patients across a diversity of care centers and socioeconomic status can have access to BillionToOne’s highly complex genetic testing
• Help digitize laborious and error-prone paper-based workflows at busy OBGYN clinics
• Enable better transfer of care through portable electronic medical records
• Infuse joyful experiences into pregnancy
• Build and maintain robust applications and systems using React, Typescript, Django, Postgres, and other libraries
• Collaborate with product design and product management to deliver delightful experiences for patients and providers
• Foster a knowledge sharing culture within the team, contributing to the growth and development of colleagues through mentorship and collaborative learning
• Demonstrate a creative and out-of-the-box mindset, offering innovative solutions and approaches to complex technical challenges
• Prioritize quality by writing comprehensive unit tests and ensuring adequate test coverage across all components and modules
• Demonstrate a strong sense of ownership and take responsibility for end-to-end project delivery. The ideal candidate will thrive in an environment where they have the autonomy to make informed decisions and take the initiative to drive projects forward
• Champion engineering excellence through architectural best practices, code quality standards, and thoughtful code reviews that emphasize both functionality and security
• Apply a security and compliance mindset ensuring adherence to relevant regulations while implementing appropriate safeguards for sensitive patient information
• Confidently challenge ideas and assumptions from stakeholders when necessary, while at the same time, leverage their expertise and insights to improve the overall solution
• Technologies we use include: Python, Django, Postgres, React, Typescript, AWS, Salesforce, and emerging AI-assisted coding environments (e.g., Cursor, GitHub Copilot, Claude Code)

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

• Have implemented frontend architecture best practices such as component systems, npm workspaces, Storybook, and Playwright testing
• Familiarity with modern AI-driven development practices and tools
• Excited about working in-person with our team in Menlo Park
• Deep experience with modern frontend technologies, specifically with Typescript, React, and CSS-in-JS libraries
• 5+ years of professional software development experience with a proven track record of delivering complex projects and adhering to best practices
• Experience with web frameworks such as Django
• Interest in engaging with and applying LLMs
• Experience in driving products from zero to one
• Familiarity with healthcare data and standards like FHIR and HL7
• Previous startup or entrepreneurial experience