Scientist - Sperm Biology

Stealth BioTech Startup; San Carlos (CA); On-site; USD 100,000 - 140,000; Full time

Benefits offered by this job

Early equity

Healthcare

On-site

Job summary

Stealth BioTech Startup in the Bay Area is seeking a scientist with deep expertise in sperm molecular biology and fertility to join our growing R&D team. You will design and execute mammalian sperm assays, optimize live-cell imaging workflows, and collaborate with the founding team to advance our early-stage technology.

This hands-on role offers high impact at the earliest stage of the company, with equity and a competitive salary.

Qualifications

• PhD-level expertise in sperm biology and related molecular biology techniques.
• Experience in designing and optimizing mammalian sperm assays.
• Strong communication and data interpretation skills.

Responsibilities

• Design, optimize, and execute experiments that test sperm health and performance
• Develop and validate live-cell staining and imaging workflows
• Analyze, interpret, and clearly communicate experimental data
• Contribute to protocol development, documentation, and future IP filings
• Help shape the scientific direction and culture of the company as an early team member

Skills

Sperm biology

Mammalian cell biology

FACS

Live-cell imaging

Data interpretation

Independent design

Communication

Education

PhD in molecular biology or related field

Job description

We're a venture-backed biotech company in the Bay Area building new technology at the intersection of genetics and reproductive biology. We're backed by world-class investors and growing the team with an in-house expert in sperm molecular biology. We're currently operating in stealth and will share more about the company and technology during the interview process.

About the Role

We're seeking a scientist with deep expertise in sperm molecular biology and fertility to join our growing R&D team. The ideal candidate will have extensive expertise in mammalian sperm biology, standard molecular biology assay development, FACS and in vitro fertilization. In this role, you’ll collaborate closely with our founding team to develop and optimize assays for improving our products designed to address reproductive challenges current and prospective parents face today.

This is a hands-on, high impact role at the earliest stage of the company, perfect for someone excited to shape the future of fertility and reproductive health.

Responsibilities

• Design, optimize, and execute experiments that test sperm health and performance
• Develop and validate live-cell staining and imaging workflows
• Analyze, interpret, and clearly communicate experimental data
• Contribute to protocol development, documentation, and future IP filings
• Help shape the scientific direction and culture of the company as an early team member

Qualifications

• PhD (or equivalent experience) in molecular biology, bioengineering, cell biology, or related field

Required Skills

• Extensive, hands-on experience with mammalian sperm cells is required, including independent experimental design, optimization, and analysis of sperm-based assays
• Proficiency in high-content imaging, cell staining and flow cytometry techniques
• Strong track record of designing and troubleshooting live-cell experiments
• Excellent communication and organizational skills
• Excited to work in a dynamic, early-stage startup atmosphere
• Motivated, independent, and excited to help build new technology

Preferred Skills

• Hands-on experience with embryos, ICSI, or IVF workflows
• Proficient with NGS workflows and data analysis
• Prior startup or technology development experience

Pay Range and Compensation Package

This is a full-time, on-site role based in San Carlos, CA.

• Salary Range: $100,000–$140,000, depending on experience
• Equity: Meaningful early-stage equity as part of the founding team
• Benefits: 401(k) with company matching, healthcare, vision and dental coverage

Equal Opportunity Statement

We're committed to building a diverse and inclusive team. We welcome applicants of all backgrounds, experiences, and identities. We do not discriminate on the basis of race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), ancestry, marital status, national origin, age, disability, genetic information, veteran status, or any other protected status under applicable laws.