Vaccines
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extraordinary minds
help protect  half a billion people

Job Title: Winter-Spring 2026 Co-Op-Intern - mRNA Drug Substance Process Development - Vaccine

Location: Waltham, MA

About the Job

The drug substance development team at Waltham, MA is composed of a group of scientists, engineers, and contractors with diverse backgrounds. We design, develop, and scale-up/down processes for mRNA drug substance from research handoff to commercial launch for up to 7 INDs per year with each IND including 1 – 8 drug substances. We foster a fast-paced but fun and uplifting environment.

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.

Main Responsibilities:

• The Co-Op supports the mRNA Drug Substance Development group in Waltham, MA.

• We are seeking an individual with basic laboratory skills and experience, who will be trained to execute experiments to execute mRNA process development studies.

• Completing small-scale buffer preparation.

• Cleaning, setting up, troubleshooting, and sanitizing small-scale process equipment.

• Documenting experiments in electronic lab notebook in an organized manner.

• Compiling and analyzing data, and presenting results to internal and external teams

• Complying with laboratory safety requirements and standard operating procedures.

• Assisting in maintaining general laboratory functionality, including lab equipment maintenance, and ordering, and receiving of lab supplies

• No travel is required

About You

Basic Qualifications:

• Currently enrolled and pursuing a bachelor's or master's degree in in Chemical Engineering, Chemistry, Bioengineering, Biochemistry, Pharmaceutical Science or related field at an accredited college or university with the expectation that you will complete your current degree by the Spring of 2029

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

• 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

Preferred Qualifications:

• Hands-on experience with filtration, chromatography, and TFF is preferred.

• Proficiency in using Microsoft Office programs (Excel, Word, PowerPoint, SmartSheet, SharePoint)

• Good written and verbal communication skills in English.

• Ability to be flexible and responsive to change, be a results-driven problem solver

• Must be curious, eager, open to learning, and independent.

About your development opportunities:

• Work with industry veterans who are open to mentorship and networking in your career and academic growth.

• Work under the guidance of seasoned professionals and subject matter experts on real multiple cutting-edge projects related to vaccine, genomic medicine, etc.

• Have plenty of opportunities to network through all sorts of fun events such as happy hour, team lunch, games etc. across mRNA CoE of Sanofi.

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. 

• Exposure to cutting-edge technologies and research methodologies. 

• Networking opportunities within Sanofi and the broader biotech community. 

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