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Salary
$61k – $116k per year
Location
In office (Limerick)
Seniority
Senior · 8+ years exp
Employment
Full-Time

Confirmed on the employer's own hiring board on Oct 20, 2026. First seen by Alion on Aug 17, 2026. Regeneron Japan scores B on the Alion truth index.

Overview
Company
Impact
Profile match
Regeneron Japan (Regeneron Japan KK) is the Japanese subsidiary of Regeneron Pharmaceuticals, a science-driven biotechnology company that invents, develops, and commercializes life-transforming medicines for serious diseases. Headquartered in Tokyo, Japan, with its global corporate headquarters located in Tarrytown, New York, the organization manages clinical trial programs, regulatory affairs, and commercial operations throughout the Japanese market. Leveraging proprietary antibody discovery and genetic research platforms, it focuses on delivering targeted treatments across therapeutic areas such as oncology, immunology, ophthalmology, and rare genetic disorders.

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 aSenior Mechanical Engineer to join ourSite Engineering team.

This position offers the opportunity to contribute to a fast-growing, science-driven organization making a meaningful difference to patients worldwide.

Where:

  • Location: Raheen, Limerick

What you’ll do:

  • Acting as the primary Mechanical Engineering representative within multidisciplinary project teams from concept development through design, construction, commissioning, qualification, and handover
  • Coordinating with Process, I&C, Electrical, Maintenance, Operations and Quality groups
  • Establishing, maintaining and continuously improving site mechanical specifications, design guidelines, equipment datasheets, piping layouts, P&IDs, utility designs, calculations, equipment evaluations, and vendor submissions
  • Supporting contractor management, construction activities, commissioning plans, startup activities, qualification support, and system turnover documentation
  • Leading mechanical engineering activities supporting manufacturing, laboratories, clean utilities, process utilities, HVAC systems, building services, and site infrastructure projects
  • Providing technical oversight and reviewing of engineering consultants, contractors, and vendor designs
  • Participating in and leading design reviews, constructability reviews, risk assessments, HAZOPs, and engineering evaluations
  • Evaluating new technologies, equipment upgrades, system expansions, and obsolescence replacement projects
  • Supporting the development of project scopes, business cases, budgets, schedules, resource plans, and technical justifications
  • Collaborating with Operations, Maintenance, Manufacturing Sciences, Process Engineering, Quality Assurance, Validation, EHS, and Facilities groups
  • Mentoring junior engineers and providing technical coaching across the Site Engineering organization

The environment and physical rhythms of this role:

  • You have excellent technical and analytical skills.
  • You are skilled at problem-solving and continuous improvement.
  • You possess strong communication and collaboration skills.
  • You are adaptable and can work in a fast-paced, regulated environment

Let’s find out if we’re a fit:

  • Bachelor’s degree in Mechanical Engineering or related discipline.
  • Minimum 8 years of engineering experience with increasing responsibility in mechanical systems, utilities, facilities, or project engineering.
  • Demonstrated experience leading mechanical engineering activities for projects within pharmaceutical, biotechnology or other highly regulated industries.
  • Strong knowledge of mechanical systems including HVAC, utilities distribution, piping systems, pumps, pressure vessels, clean utilities, and facility infrastructure.

Thrive today. Grow tomorrow.

#LI-Onsite #JOBSIEPR #IRELIM #REGNIRLTO

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)

€54,200.00 - €103,200.00
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