Job Title: Senior Associate Scientist

• Location : Vitry-Sur-Seine – France

About the job

As an Upstream Process Development Scientist supporting early-stage biopharmaceutical candidates, you will execute experiments and contribute technical expertise to process optimization and scale-up activities using CHO cell culture platforms. You'll work in a dynamic, cross-functional environment, applying platform-based approaches including fed-batch, perfusion, and intensified culture strategies while supporting timely project delivery. Ready to begin?

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.

Key Responsibilities:

• Execute upstream process development activities for early-stage clinical candidates, performing experiments to characterize and optimize cell culture processes using lab-scale bioreactors and advanced platforms including Ambr250 systems.
• Conduct cell line evaluation studies, media optimization experiments, and process parameter characterization in sterile environments across multiple culture modes (fed-batch, perfusion, intensified cultures).
• Operate and maintain ATF (Alternating Tangential Flow) systems for perfusion culture applications and support process automation initiatives.
• Analyze experimental data using statistical and visualization software (JMP or equivalent) and contribute to technical discussions for process development.
• Support process development timelines and collaborate cross-functionally with analytical development, downstream processing, manufacturing, and regulatory teams.
• Prepare technical documentation, contribute to development reports, and support technology transfer activities to clinical manufacturing sites

About you

Experience:

Hands-on experience with CHO cell culture techniques, lab-scale operations in sterile environments, and data analysis using statistical software

Technical and Soft Skills:

Proficiency in analyzing data and drawing scientific conclusions, strong foundation in cell culture biology and bioprocess engineering, analytical thinking, technical versatility with diverse culture modes, effective teamwork and communication skills, adaptability to learn new techniques, and attention to detail in laboratory work

Education: Master's degree in Biotechnology, Biochemical Engineering, Cell Biology, or related scientific discipline

Languages: Fluent English and French (written and oral)

Why choose us?

Join the engine of Sanofi’s mission — where deep immunoscience meets bold, AI-powered research. In R&D, you’ll drive breakthroughs that could turn the impossible into possible for millions

• Work at the forefront of drug discovery, harnessing cutting-edge AI, data, and digital platforms to push the boundaries of science.
• Help improve the lives of millions of people globally by making drug development quicker and more effective.
• Enjoy opportunities to collaborate beyond your area of expertise, working with diverse teams across science, clinical, and digital fields to spark new ideas and drive breakthroughs.
• Accelerate your professional development with structured career paths designed for both scientific and leadership advancement. Grow in ways you never imagined through bold moves that stretch your potential, cross moves into other business areas, and short-term gigs that build your scientific expertise.

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#LI-Hybrid

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.

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.

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!