
Manufacturing and Supply
Where the
miracles of
science are made
a reality for patients
Principal Scientist
At a glance
Our teams produce and deliver over 4 billion units of medicines and vaccines every year, ensuring every breakthrough gets to the people who need it most.
Our state-of-the-art facilities, AI-powered smart factories, and cutting-edge automation are redefining what’s possible: ensuring treatments reach patients faster, safer, and more sustainably than ever before. This is where your skills, ambition, and passion can shape the future of healthcare.
Job Title: Principal Scientist
Location: Framingham, MA
About the Job
We deliver 4.3 billion healthcare solutions to people every year, thanks to the flawless planning and meticulous eye for detail of our Manufacturing & Supply teams. With your talent and ambition, we can do even more to protect people from infectious diseases and bring hope to patients and their families.
Sanofi’s Global MSAT (Manufacturing Sciences, Analytics, and Technology) acts as a crucial link between our R&D and Manufacturing entities, playing an instrumental role in enhancing our current portfolio and delivering future launches of high-quality and innovative drugs and vaccines. Global MSAT is a beacon of innovation and process excellence in Manufacturing, this includes guiding the journey of new products from their launch to commercial success, being at the forefront of Data Sciences and Digitalization.
Join a team of talented and passionate international experts, scientists, and project leaders dedicated to inventing, designing, industrializing, and implementing cutting-edge industrial chemical and biological processes, analytical methods, and process modeling to successfully launch 3 to 5 new products by year.
The Principal Scientist in Downstream Process (DSP) will be part of the subject matter expert team and is responsible for providing technical leadership in monitoring and improving chromatography and filtration process performance at pilot and manufacturing scale.
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:
Represent MSAT as a DSP subject matter expert (chromatography and filtration) in various technical forums within the broad Sanofi network. Drive DSP operation standardization and best practice across platforms (Mammalian, Microbial, Vaccine). Serve as a core point of contact to support MSAT programs and global manufacturing sites, and to collaborate with R&D/CMC teams.
Lead complex manufacturing investigation such as large column packing performance; pre-packed column quality, raw material (resin and filter) quality and performance, chromatography and filtration skid equipment cleaning/sanitization/storage, filter integrity test variation, bioburden and contamination control, Unit operation automation, and other scalability and manufacturability issues. Provide key technical guidance to manufacturing support teams by integrating knowledge from process, operation, equipment, and raw material.
Responsible for DSP pilot operation design and practice. Work with MSAT pilot teams to establish the scale-up guidelines for various DSP operation. Draft training protocols for manufacturing staff at pilot facility. Work with MSAT and CMC pilot teams to drive the necessary pilot data package to evaluate facility fit and manufacturability. Lead pilot scale studies to drive investigation and process definition.
Lead DSP innovations from conceptualization to implementation. Work with MSAT teams to design and implement innovations such as custom designed chromatography or filtration skid, continuous DSP configuration and PAT, custom fabricated resins, filters, absorbers, and fibers. Lead collaboration with Sanofi suppliers and external partners to enable preferred raw material supply with acceptable standards.
Support other downstream unit operations such as centrifugation, viral inactivation, freezing/thawing, and protein stability. Support next generation process development, control strategy implementation, process validation, Tech Transfer, process comparability for global MSAT program launch at both Internal and external manufacturing sites
Support Quality and Regulatory during health authority inspection and prepare for supportive documents for new filings or responses. Lead internal report preparation to support various regulatory activities.
Serve as a technical mentor to MSAT team members, provide training and supervision to project team members as needed. Participate in internal and external scientific exchanges to enhance MSAT competencies and reputation.
About You
Qualifications/ Education & work experience
Master or PhD degree in Biological/Biomedical, Sciences/Engineering
10+ years of experience related to biopharmaceutical industry. Minimum of 5 years of hands-on experience in downstream manufacturing support or field technical support from a major supplier
Process knowledge across multiple modalities (e.g. mAbs, small protein and peptide, bioconjugates, nucleotides, Gene/cell therapy, organic chemistry etc.)
Extensive knowledge with pilot and manufacturing scale chromatography and filtration equipment and operation
In-depth understanding of various chromatographic separation mechanisms including affinity, ion-exchange, Hydrophobic, and Mix-mode. In-depth understanding of different filtration fundamentals (TFF, sterile filtration, membrane and fiber applications) and different operation modes (single-pass, alternative pass, continuous, nominal and tangential)
Prior experience of managing contractor manufacturing or contract research partners
Excellent scientific background and effective communication skills. Demonstrated ability to manage and prioritize multiple projects and consistently meet deadlines
Highly motivated individual with the ability to work independently as well as within cross-functional and cross-site teams
Oral and written fluency in English
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.
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.
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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

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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.
All-in on diversity
At Sanofi, diverse perspectives fuel the best solutions for patients. Hear from Monique Vessey, our Supply Chain Transformation Leader, on how her background shapes her approach to delivering life-changing medicines.

"Manufacturing and Supply is the bridge between the science that happens in research laboratories and the people and communities we serve."

Brendan O’Callaghan
Executive Vice President of Manufacturing and Supply
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