Manufacturing and Supply
Where the
miracles of
science are made
a reality for patients

Job Title: Winter-Spring 2026 Co-op-Intern-- Recombinant Mammalian MSAT Downstream

Location: Cambridge, 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. 

The 2026 Spring Co-Op will work in the downstream process development group of the drug substance function in Recombinant Mammalian Science, Analytics, and Technology (MSAT). The co-op will work in a laboratory setting on a project related to protein purification process characterization and protein drug substance stability. This position is 6 months on a full-time basis January 2026 – June 2026.

The drug substance function within Recombinant Mammalian Science, Analytics, and Technology (MSAT) is the owner of Life Cycle Management (LCM) of DS Processes within Sanofi biologics manufacturing network. We deliver innovative, robust, and cost-effective next generation processes and provide commercial manufacturing support. The function is responsible for tech transfer activities including process fit-gap assessment, process validation, prepare dossier sections, & PAI support to enable launch of new and LCM products. Our expansive portfolio covers 17 products, 5 modalities, 3 expression systems within 12 internal and external global sites in US and EU. We will be supporting launch of 20 new products in next 5 years including monoclonal and multi-specific antibodies, fusion proteins, antibody-drug conjugates, synthorins and nanobodies. In recent years we have successfully established second-generation manufacturing process with a continuous process platform. We are pursuing future innovations such as digital labs, factories of future and advanced analytics-based process understanding and control.

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:

• Work on an MSAT development project, to include execution of chromatography and filtration operations, protein stability studies, analytical testing, and data analysis.

• Collaborate with the MSAT project team; attend regular team meetings and share study Progress and results.

• Participate in design and execution of experiments using small-scale models, analyze and interpret results, and recommend additional experiments.

• Author internal presentations, protocols, and technical reports, as applicable.
  

About You

Must be permanently authorized to work in the U.S. and not require sponsorship of an employment visa (e.g., H-1B or green card) at the time of application or in the future. Students currently on CPT, OPT, or STEM OPT usually require future sponsorship for long term employment and do not meet the requirements for this program unless eligible for an alternative long-term status that does not require company sponsorship

Basic Qualifications:

• Currently pursuing a Bachelor's, Master's, or PhD in Chemical Engineering, Biochemistry, Biotechnology, or related discipline at an accredited college or university with the expectation that you will complete your current degree by the Spring of 2027   

• Must be able to relocate to the office location and work 40hrs/week, Monday-Friday, for the full duration of the co-op/internship

Preferred Qualifications:

• Experience in a biotechnology or pharmaceutical industry laboratory setting

• Experience with downstream processes at lab, pilot, or production scale including chromatography (e.g. AKTA), tangential flow filtration, or nanofiltration

• Knowledge in protein stability studies and routine protein analytical techniques

• Strong technical writing and presentation skills

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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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