Principal Scientist
- Team:Industrial Operations & Product Supply
- Location:East Greenbush, United States of America


Build our future together:
At Regeneron, we use science and innovation to develop life-changing medicines for people with serious diseases. Regeneron is currently seeking a QC Microbiology Associate Scientist / Scientist to join our QC Tech Resources team.
This position offers the opportunity to contribute to a fast-growing, science-driven organization making a meaningful difference to patients worldwide.
Location: Raheen, Limerick
Validating methods and equipment related to sterility, bioburden, endotoxin testing, and microbial identifications.
Writing technical documentation, including position papers, validation reports, and microbiological investigations.
Culturing organisms, conducting research, and characterizing them for use in investigations and cleaning development.
Reviewing new test procedures and assays for accuracy and compliance.
Evaluating and acquiring new methodologies, techniques, and equipment as needed.
Overseeing contract laboratory testing to ensure quality and compliance.
Setting product specifications and alert/action levels for microbiological standards.
Leading technical troubleshooting and problem investigations.
Reviewing assay, process, and equipment validation reports, as well as other technical documents for correctness and regulatory compliance.
Coaching junior team members on good microbiology lab practices and modern aseptic techniques.
Supporting and participating in regulatory inspections to ensure compliance.
Demonstrating investigational skills and working knowledge of microbiology assay development and validation.
You have a proven record to work independently or as part of a team.
Possessing a strong background in pharmaceutical microbiology, GMP working experience in QC labs, and aseptic techniques.
You possess strong trouble-shooting and problem solving skills.
You have strong attention to detail & excellent written and oral skills.
Assoc QC Microbiology Scientist: Minimum 0-2 years of Experience
QC Microbiology Scientist: Minimum 2 years of Experience
To be considered for this opportunity you should have a BS/BA or equivalent experience in Microbiology or related field and 2+ years of validated experience, or equivalent combination of education and experience.
Thrive today. Grow tomorrow.
#IRELIM #JOBSIEST #LI-Onsite #REGNIEQC
Does this sound like you? Apply now to take your first step towards living the Regeneron Way! We are committed to building a workplace with an inclusive culture. Regeneron is an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion or belief (or lack thereof), sex, sexual orientation, gender identity or expression, gender reassignment, marital or civil partnership status, civil status, pregnancy or parental status, age, disability, nationality, citizenship status, ethnic or national origin, membership of the Traveler community, familial status, genetic information, military or veteran status, or any other characteristic protected under applicable law. Where required, we will provide reasonable accommodation to applicants with known disabilities or chronic illnesses during the recruitment process, unless such accommodation would impose undue hardship.
Where necessary, we disclose salary ranges for roles in all countries in which we operate. The final offer will be determined within the relevant range based on the country of employment, specific role level, and your skills and experience. In some countries, collective bargaining agreements (CBAs) may apply and influence certain elements of pay or benefits. Regeneron offers a competitive and comprehensive total rewards package which may include, depending on country and role: annual bonuses or other incentive plans, equity awards, pension or retirement benefits, 401(k) company match, health and wellness programs, fitness centers, insurance benefits (e.g. medical, dental, vision, life and disability), paid time off, and family support benefits. For additional information about Regeneron benefits in the U.S., please visit https://careers.regeneron.com/en/working-at-regeneron/total-rewards/. For other locations, additional information will be provided during the recruitment process. If you have any questions, please speak with your recruiter.
Please be advised that at Regeneron, we believe we do our best work when we are together. For that reason, many roles are required to be performed on‑site. Please speak with your recruiter and hiring manager for more information about on‑site expectations for your role and location.
As part of the recruitment process, certain background checks may be conducted in accordance with the laws of the country where the position is based. The purpose of such checks is to verify certain information prior to the commencement of employment such as identity, right to work and educational qualifications.
For jobs in Canada: this posting is for an existing position.
Salary Range (annually)
€37,000.00 - €88,400.00
We take hiring seriously — because finding the right person for our mission matters as much to us as finding the right company matters to you. Our process is thorough by design: we want every new hire to feel confident they've found a place where their work truly matters, and we want to be just as confident we've found someone who'll thrive here. It's a two-way conversation, not a one-way interview.
Curious what that looks like step by step? Check out How We Hire.

Here, you’ll collaborate with teams across regions to help move our mission forward.
We invest in your health and stability so you can focus on making meaningful impact. Below is a highlight of benefit programs that may be available to you, depending on your country of employment, role, etc.




From application to your first day — here's how it works.

Browse open roles at careers.regeneron.com, filtered by department, location or category. You can also create a job alert or join our Talent Community to get matched with new openings as they post.
See something you like? Submit your application for the role that fits your background and goals.
We review your application and if your experience is a match, we'll reach out to start the conversation. Some roles include a seminar or technical exercise — we'll always tell you in advance.
After interviews and careful consideration by the hiring team, we'll follow up either way. If you're selected, we'll walk you through the offer — compensation, benefits, and start date.
Nachdem du unser Angebot angenommen hast, unterstützen wir dich bei der Vorbereitung auf deinen ersten Arbeitstag. Ob wichtige Unterlagen, Informationen zu deinem Arbeitsplatz oder, falls erforderlich, Unterstützung bei einem Umzug – wir sorgen dafür, dass du bestens vorbereitet in deine neue Rolle starten kannst.
