Senior AI Engineer I

Location: Menlo Park, CA Remote Work: Hybrid role requiring 2-3 days per week on-site in Menlo Park Employment Type: Full-time senior role Experience Level: 5+ years of experience required Salary Information:

Base pay range: $192,932 - $214,369 per year
Total compensation package: $300,806 per year (includes base pay, equity options, corporate bonus program, and company benefits)

A Rare Opportunity to Shape the Future of Genomics

Join a team of brilliant, passionate innovators determined to transform healthcare. At BillionToOne, we've built a category-defining, publicly traded company on Nasdaq where transparency fuels trust, collaboration drives breakthroughs, and every contribution moves the needle on our mission to make life-changing diagnostics accessible to all. We don't just aim for incremental improvements; we build products that are 10x better than anything that exists today. Our scientists, engineers, sales executives, and visionaries are united by an unwavering commitment to changing the standard of care in prenatal and cancer diagnostics. This is where cutting-edge science meets human compassion, and every innovation you contribute helps remove the fear of the unknown from some of life's most critical medical moments. If you're driven by purpose, energized by innovation, and ready to help shape the future of precision medicine at scale, this is where you belong. As BillionToOne scales rapidly, we are building a world-class Commercial Data & Applied AI team. We are currently seeking a highly motivated Senior AI Engineer I to support the design and implementation of AI and automation solutions that optimize operations across our commercial, billing, and customer experience teams. This is a full-time senior role for engineers excited about applying LLMs, AI, and automation to real-world business challenges in healthcare. You will have the opportunity to join a new team and help shape the vision and culture. You will collaborate cross-functionally with stakeholders in Sales, Marketing, Revenue Operations, Billing, Customer Experience, and IT to identify high-impact opportunities for AI-driven solutions that improve scalability and efficiency. We are builders at heart. We value a strong sense of ownership, intellectual curiosity, and a bias toward action. This is a hybrid role requiring 2-3 days per week on-site in Menlo Park with the team.

Responsibilities:

Build and deploy LLM-powered applications (retrieval systems, AI agents, workflow automation, vector storage) that integrate with internal systems and data sources
Partner with business stakeholders to identify automation opportunities, scope requirements, and define success metrics
Build lightweight data pipelines and analytics to support AI applications and measure their impact
Own projects end-to-end: from prototyping and iteration through production deployment and monitoring
Establish best practices for prompt engineering, evaluation, and responsible AI use as the team scales
Develop and lead internal training sessions on LLM fundamentals, prompt engineering, and AI-assisted development tools

Qualifications:

5+ years of experience in software engineering, data science, or ML engineering
Hands-on experience building applications with LLM APIs (OpenAI, Anthropic, etc.)
Strong Python proficiency and comfort with SQL and relational databases
Experience deploying and maintaining production systems
Familiarity with AWS
Excellent communication skills and ability to translate business problems into technical solutions
Self-directed and comfortable with ambiguity in a 0-to-1 environment

Nice-To-Haves:

Previous entrepreneurial experience
Experience with retrieval architectures, vector databases, and embedding models
Familiarity with agent frameworks or workflow orchestration tools
Experience with traditional ML frameworks (scikit-learn,Pytorch,TensforFlow)
Prior work in healthcare biotech or other regulated industries

Benefits And Perks:

Working alongside brilliant kind passionate dedicated colleagues in an empowering environment toward a global vision striving for transformative molecular diagnostics helping millions of patients
Open transparent culture including weekly Town Hall meetings
Ability to indirectly or directly change 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 eligible employees (16 weeks paid at 100%)
Supplemental fertility benefits coverage
Retirement savings program including a 4% Company match
Increased paid time off with increased tenure
Latest hardware (laptop etc.)
Daily on-site lunches from top eateries
Campus perks including state-of-the-art gym & restaurant
Free on-site EV charging compatible with all EVs including Tesla