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Vaccines

Vaccines
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extraordinary minds
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half a billion people

Associate Scientist

Marcy-l'Étoile, France
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Who we are

Every day, 2.5 million Sanofi vaccine doses reach patients worldwide - powered by bold ideas, cutting-edge science, and passionate people like you. Across every stage — from discovery to delivery — Sanofians are shaping the future of vaccines. In global R&D hubs, exceptional offices, and state-of-the-art manufacturing sites, we’re reimagining what’s possible. But science alone isn’t enough — it’s the extraordinary minds behind it that truly make the difference.

Le contenu du poste est libellé en anglais car il nécessite de nombreuses interactions avec nos filiales à l’international, l'anglais étant la langue de travail.

This job offer is accessible to all, regardless of gender.

Job title: Associate Scientist

  • Location: Marcy L'Étoile 100% on site

About the job

Our Team:

The Biomarker Research unit in the mRNA Center of Excellence is building a world-class translational research team and is seeking highly motivated Associate Scientist interested in clinical exploratory assays to assess the immunogenicity, reactogenicity, and MoAs of mRNA vaccines in early translation and Phase 1/2 clinical trials.

The candidate should be familiar with concepts in human immunology and vaccinology as well as working experience with standard immunological laboratory techniques, such as flow cytometry, single cell, multiplexing technologies to quantify cytokines and tissue culture of human peripheral blood mononuclear cell for immune assays. The successful candidate will have the ability to learn and innovate immunological assay techniques and methodologies. The candidate will be expected to create experimental plans, implement in vitro assays, perform immunological assays, as well as prepare reports and present results.

The candidate should remain up-to-date on the relevant scientific literature related to clinical exploratory immunology. The candidate will be ready to hit the ground running in a fast-paced environment that rewards personal initiative, collaboration, and scientific excellence.

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:

  • Support execution on in vitro immunological and cellular assays to evaluate the biological functions of mRNA vaccine candidates in human immune cells
  • Have a strong proficiency with Cytometry and multiplex cytokine array assay methods
  • With oversight, exercise creativity in devising new protocols and/or strategies to solve complex problems or optimize assays for stronger performance
  • Support the clinical exploratory protocol development and associated clinical documentation
  • Effectively record and report experiments, maintaining GRP and HSE standards and policies
  • Collaborate on project experimental study plans, reports, presentations, publications, and patents
  • The position requires work with human blood products

About you

  • MSc with entry level training in immunology, biomedical, or applied science field
  • Demonstrated experience with cell culture/PBMCs methodologies is required; immunological assay experience with flow cytometry is highly preferred
  • Ability to support preparation of results into visually appealing and understandable stories
  • Critical Thinking and Problem Solving, Collaboration and Teamwork,Time Management and Organization
  • Excellent knowledge of English language (spoken and written); French is a plus

PursueProgress.DiscoverExtraordinary.

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.

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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.

Watch 'One day at Sanofi' and check out our Diversity Equity and Inclusion initiatives at sanofi.com

Apply now
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Why work with us

  • We’re problem-solvers and pioneers. United by the belief that everyone deserves a healthier future. We create best-in-class vaccines that prevent disease and protect lives.

  • Innovation drives us. From AI and mRNA to next-gen science, we push the boundaries to deliver first- and best-in-class vaccines for infectious diseases worldwide.

  • Growth happens here. With bold investments in R&D and world-class facilities, Sanofians across the entire vaccine lifecycle are shaping the future of global health.

  • We do what’s right. Sustainability and DE&I drive our positive global impact—because the diverse communities Sanofians represent are the patients we serve.

What does it take to protect the world from disease?

For over a century, we’ve been pioneering breakthroughs that help protect millions from diseases like polio, influenza, RSV, and more. And we’re not stopping there.

Powered by groundbreaking technologies - mRNA platforms, recombinant proteins, and AI-driven insights - we’re pushing the boundaries of science.

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"I’m immensely proud of the pace of our innovation – the urgency by which our teams are working to transform the practice of medicine."

Thomas Triomphe

Executive Vice President, Vaccines

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Sanofi’s mRNA Center of Excellence

Step into the future of healthcare with Sanofi’s mRNA Center of Excellence. Discover how a global team is transforming medicine with cutting-edge mRNA technology – and explore the skills, inspirations, and breakthroughs driving this revolution. Ready to shape the future?

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About Sanofi Vaccines

Explore our commitment to protecting global health through the power of vaccines. We’re building healthier communities with innovative solutions that save millions of lives each year. Dive into the future of vaccines, discover the diseases we’re tackling, and learn why vaccination is critical at every stage of life.

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