Vaccines
Where
extraordinary minds
help protect  half a billion people

Job Title: Summer 2026 Intern - mRNA CoE - DNA Process Development and Supply - Vaccine

Location: Waltham, MA

About the Job

Sanofi is seeking a highly motivated and scientifically rigorous individual to join the DNA Process Development & Supply team. You will focus on execution and scale-up of a robust DNA production process through fermentation, cell lysis extraction, linearization, and purification for preclinical linearized plasmid DNA production, including fermenter characterization, kLa measurement, etc.

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.

• Evaluate, and implement new biology and purification technology and optimize existing techniques and workflows, including the execution and optimization of plasmid production, problem solving.

• Execute experiment overseed by Scientist.

• Work independently, pro-actively, and be an impactful contributor to project teams. Function in highly collaborative cross functional teams.

• This will be a lab-based position.

About You
Basic Qualifications:

• Currently enrolled and pursuing a bachelor's in biology, Molecular Biology, Biochemistry, Bioengineering, Chemical Engineering or related field at an accredited college or university with the expectation that you will complete your current degree by the Spring of 2028

• Must have completed both a lecture and a lab course within chemistry/biochemistry with hands on experiment of lab work and good lab behavior.

• 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:

• Basic understanding of laboratory equipment and analytical instruments.

• Ability to work in Biosafety Level 1, follow safe lab procedures, and maintain good laboratory practices (GLPs) including detail-oriented laboratory notebook documentation.

• Works collaboratively within group for improved operational excellence as well as within interdisciplinary teams.

• Desire to work in a team-first, fast-paced environment, learn new technologies and skills, and to efficiently solve problems.

• Excellent organizational and communication skills.

• Attention to detail & meticulous record keeping.

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.

• Exposure to cutting-edge technologies and research methodologies. 

• Networking opportunities within Sanofi and the broader biotech community. 

The salary range for this position is ​$29-$35 hourly​. All compensation will be determined commensurate with demonstrated experience. Employees may be eligible to participate in Company employee benefit programs. Additional benefits information can be found through LINK.​

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