Vaccines
Where
extraordinary minds
help protect  half a billion people

Job Title: Senior Associate Scientist, In Vitro Biology and Mechanism of Action

• Location: Waltham, MA

About the Job

We are seeking a highly motivated individual to join the In vitro biology and mechanism of action team within the mRNA center for Excellence to support the advancement of our RNA vaccine platform. As a Senior Associate Scientist, you will be designing and executing experiments to understand the mechanism of RNA therapeutics and vaccines for the treatment of infectious and non-infectious diseases.

We are an innovative global healthcare company that helps the world stay ahead of infectious diseases by delivering more than 500 million vaccine doses a year. Across different countries, our talented teams are exploring new technologies to protect people and promote healthy communities. We chase the miracles of science every single day, pursuing Progress to make a real impact on millions of patients around the world.​

Join the team protecting half a billion lives every year with next-gen science, mRNA innovation, and AI-driven breakthroughs. In Vaccines, you’ll help advance prevention on a global scale - and shape the future of immunization.

About Sanofi:

We’re an R&D-driven, AI-powered biopharma company committed to improving people’s lives and delivering compelling growth. Our deep understanding of the immune system – and innovative pipeline – enables us to invent medicines and vaccines that treat and protect millions of people around the world. Together, we chase the miracles of science to improve people’s lives.

Main Responsibilities:

• Lead from the bench to support the pre-clinical research of Sanofi’s next generation RNA platform and support programs by designing and executing experiments targeted toward elucidating the mechanism of action for RNA vaccines and therapeutics

• Perform cell transfection with RNA and LNP formulations to determine efficacy and protein expression using immunofluorescence, live imaging, and reporter assays

• Utilize and adapt to a variety of lab techniques such as RT-qPCR, Flow cytometry, western blot, and ELISA to generate high-quality data to support the RNA platform and programs

• Maintain both immortalized and primary cell cultures for downstream protein expression and NGS analysis

• Conduct decision-quality research, organize, analyze and interpret data, summarize results and prepare technical reports.

• Prepare scientific presentations and report project progress at internal team meetings and scientific research forums

• Work in a highly collaborative team to drive overall group objectives forward

• Assume additional responsibilities as assigned. 

About You:

Basic Qualifications:

Education:

• Bachelor's OR Master's degree in biology, chemistry, biomedical sciences, pharmaceutical sciences, life sciences or related fields

​Experience:

• Bachelor's holders: Minimum of 2 years of relevant industry, academic or research experience

• Master's holders: Minimum of 1 year of relevant industry, academic or research experience

• Hands-on background in cell culture

• Experience with imaging techniques and microscopy

Preferred Qualifications:

• Experience working with nucleic acid modalities such as mRNA, siRNA, miRNA, or gene editing

• Familiarity with additional lab techniques such as gene expression analysis, protein detection methods, and flow cytometry

• Prior experience in a biopharma or biotech company setting

• Desire to learn new techniques and scientific concepts to follow the research as it progresses

• Excellent communication skills, both oral and written with the ability to convey key experimental findings to internal stakeholders

• Well organized with a curious mindset and extreme attention to detail. Strong desire to make an impact

• Ability to work collaboratively in a fast-paced, cross-functional, demanding work environment without compromising quality. Understand the sense of urgency and respect project timelines

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.

• Work at the forefront of AI-driven research, smart manufacturing, and groundbreaking mRNA platforms that are redefining the future of immunology.

• Help protect half a billion people every year, contributing to one of the largest global vaccination efforts in healthcare.

• Develop your career with access to mentoring, international mobility programs, and opportunities to grow across four continents.

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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All compensation will be determined commensurate with demonstrated experience. Employees may be eligible to participate in Company employee benefit programs, and additional benefits information can be found here.

Pursue Progress. Discover Extraordinary.

Join Sanofi and step into a new era of science - where your growth can be just as transformative as the work we do. We invest in you to reach further, think faster, and do what’s never-been-done-before. You’ll help push boundaries, challenge convention, and build smarter solutions that reach the communities we serve. Ready to chase the miracles of science and improve people’s lives? Let’s Pursue Progress and Discover Extraordinary – together.

At Sanofi, we provide equal opportunities to all regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, protected veteran status or other characteristics protected by law.