Scientist I

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Job Title: Scientist I

Location : Cambridge, MA

About The Job

Are you ready to shape the future of medicine? The race is on to speed up drug discovery and development to find answers for patients and their families. Your skills could be critical in helping our teams accelerate progress.

We are looking for an enthusiastic PhD-level scientist interested in developing and implementing in vitro cellular models within the Global Investigative Toxicology group at Sanofi USA for safety applications. The incumbent will perform in vitro studies to assess the role of therapeutic modalities and uncover mechanisms that lead to unexpected toxicity of small and large molecule candidates by employing fit-for-purpose cutting edge in vitro models. The successful candidate must have good collaborative skills to smoothly work with Sanofi colleagues across sites and with external vendors, a high level of scientific rigor in their work, and exemplary communication skills. You will collaborate with a diverse group of experts at Sanofi to push the boundaries of science and help to bring innovative and safe medications to the patients.

We are an innovative global healthcare company with one purpose: to chase the miracles of science to improve people’s lives. We’re also a company where you can flourish and grow your career, with countless opportunities to explore, make connections with people, and stretch the limits of what you thought was possible. Ready to get started?

Main Responsibilities

• Develop and optimize physiologically relevant in vitro models, including providing technical expertise, design and execute qualification plans, and establish relevant endpoint assays to dissect the molecular mechanisms of toxicity.
• Independently review literature to generate hypotheses for experimental testing. Design and execute relevant experiments to test hypotheses, including data analysis and its interpretation.
• Collaborate with external vendors on technology and assay evaluation, where appropriate.
• Work with project teams to address and investigate safety mechanisms and help projects meet development timelines.
• Author investigative reports to support inclusion of results in regulatory submissions as needed.
• Represent Sanofi on external consortia.

About You

Requirements & Qualifications

• PhD in a biological field with 0-3 years of postdoctoral experience OR Master’s Degree with 4+ years relevant experience in an academic or biopharmaceutical setting.
• A degree in toxicology, pharmacology, immunology, biomedical engineering, or equivalent is preferred.
• Proven experience and expertise in mammalian cell culture (primary, iPSC), imaging (high content, confocal), molecular biology (RNA, DNA, protein) endpoints, and biochemical endpoints is a must.
• Working knowledge of organ-on-a-chip/MPS, 3D models, or complex in vitro systems will be an advantage.
• Experience in toxicity assays related to liver, kidney or immunology is also a plus.
• Established record of scientific contribution in peer-reviewed journals and scientific symposiums.
• Excellent verbal and written communication skills.

Terms of employment

• Occasional domestic travel to scientific conferences as permitted by Sanofi travel policies. Availability to start in Q1 2026.

Location information

• The position is lab-based and requires the incumbent to be on-site most days of the week in Cambridge, MA.

Why Choose Us?

• Bring the miracles of science to life alongside a supportive, future-focused team.
• Discover endless opportunities to grow your talent and drive your career, whether it’s through a promotion or lateral move, at home or internationally.
• Enjoy a thoughtful, well-crafted rewards package that recognizes your contribution and amplifies your impact.
• Take good care of yourself and your family, with a wide range of health and wellbeing benefits including high-quality healthcare, prevention and wellness programs and at least 14 weeks’ gender-neutral parental leave.
• Be part of an active, innovative scientific group
• Gain broad expertise in novel in vitro models
• Have diverse opportunities to collaborate global
• Be highly recognized for success
• Receive excellent benefits and compensation

Sanofi Inc. and its U.S. affiliates are Equal Opportunity and Affirmative Action employers committed to a culturally diverse workforce. All qualified applicants will receive consideration for employment without regard to race; color; creed; religion; national origin; age; ancestry; nationality; marital, domestic partnership or civil union status; sex, gender, gender identity or expression; affectional or sexual orientation; disability; veteran or military status or liability for military status; domestic violence victim status; atypical cellular or blood trait; genetic information (including the refusal to submit to genetic testing) or any other characteristic protected by law.

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Pursue progress , discover extraordinary

Better is out there. Better medications, better outcomes, better science. But progress doesn’t happen without people – people from different backgrounds, in different locations, doing different roles, all united by one thing: a desire to make miracles happen. So, let’s be those people.

At Sanofi, we provide equal opportunities to all regardless of race, colour, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, ability or gender identity.

Watch our ALL IN video ( and check out our Diversity Equity and Inclusion actions at sanofi.com ( !

US and Puerto Rico Residents Only

Sanofi Inc. and its U.S. affiliates are Equal Opportunity and Affirmative Action employers committed to a culturally inclusive and diverse workforce. All qualified applicants will receive consideration for employment without regard to race; color; creed; religion; national origin; age; ancestry; nationality; natural or protective hairstyles; marital, domestic partnership or civil union status; sex, gender, gender identity or expression; affectional or sexual orientation; disability; veteran or military status or liability for military status; domestic violence victim status; atypical cellular or blood trait; genetic information (including the refusal to submit to genetic testing) or any other characteristic protected by law.

North America Applicants Only

The Salary Range For This Position Is

$84,000.00 - $121,333.33

All compensation will be determined commensurate with demonstrated experience. Employees may be eligible to participate in Company employee benefit programs. Additional benefits information can be found through the LINK ( .

Global Terms & Conditions and Data Privacy Statement (

Sanofi is dedicated to supporting people through their health challenges. We are a global biopharmaceutical company focused on human health. We prevent illness with vaccines, provide innovative treatments to fight pain and ease suffering. We stand by the few who suffer from rare diseases and the millions with long-term chronic conditions.

With more than 100,000 people in 100 countries, Sanofi is transforming scientific innovation into healthcare solutions around the globe. Discover more about us visiting or via our movie We are Sanofi (

As an organization, we change the practice of medicine; reinvent the way we work; and enable people to be their best versions in career and life. We are constantly moving and growing, making sure our people grow with us. Our working environment helps us build a dynamic and inclusive workplace operating on trust and respect and allows employees to live the life they want to live.

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If you have questions about this posting, please contact [email protected]