BillionToOne (YC S17, NASDAQ: BLLN)

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← All postings · April 2026 thread

Senior Software Engineer

Company	BillionToOne (YC S17, NASDAQ: BLLN)
Website	engineering.billiontoone.com ↗
Roles	Senior Software Engineer Senior AI Engineer AI Engineering Intern Lead UX Designer / Designer
Type	internship
Role taxonomy	Software Engineering AI / ML / Research Design Intern
Specialties	Software Engineering, Machine Learning, Design
Location	Menlo Park, CA
Salary	—
Apply via	Application link — https://www.youtube.com/watch?v=kkv5rZhrLkc · kwu@billiontoone.com
Hiring notes	Interns welcome.
Tech	TypeScript React Python PostgreSQL AWS ML/AI
Parsed locations	Menlo Park, CA
Posted by	kevinwuhoo
Posted	Apr 8, 2026
Source	View on Hacker News ↗

Original posting

BillionToOne (YC S17, NASDAQ: BLLN) | Menlo Park, CA | Onsite We're a molecular diagnostics company. YC made a video of us recently: https://www.youtube.com/watch?v=kkv5rZhrLkc. Our software team creates products that help detect prenatal genetic conditions non-invasively and uncover 50%+ more cancer treatment options. Your code reaches patients and the providers making decisions for them. Stack: Python, React, TypeScript, AWS, Postgres. We believe in small teams with high ownership. We're hiring: - Senior Software Engineer (Prenatal, Oncology, Digital Experiences) - Senior AI Engineer - AI Engineering Intern - Lead UX Designer / Designer See our engineering specific recruiting page at https://engineering.billiontoone.com/#roles. You can reach out to me directly with a resume at kwu@billiontoone.com.