HR Generalist

Celltrion is a leading biopharmaceutical company that specializes in research, development and manufacturing of innovative therapeutics. We are committed to delivering innovative and affordable medications to promote patients’ access to advanced therapies. We have been at the forefront of biotherapeutic development uncovering new ways of targeting the drivers of disease by creating next-generation biologics and small molecule products.

Headquartered in New Jersey, Celltrion USA is committed to expanding access to biologics to improve care for U.Celltrion USA will continue to leverage Celltrion’s unique heritage in biotechnology, supply chain excellence, and best-in-class sales capabilities to improve access to high-quality biopharmaceuticals for U.Celltrion USA, a subsidiary of Celltrion, acquired Eli Lilly’s manufacturing facility located in Branchburg, New Jersey in September 2025, with the deal closing anticipated by the end of 2025. Please note that while the company name is currently listed as Celltrion USA for the purposes of this job posting, the actual employing entity and work location for this position will be the Branchburg manufacturing site.

Position Brand Description:

The HR Generalist supports day-to-day Human Resources operations for our U.S. manufacturing site and is responsible for managing core HR administrative processes, including payroll support, employee data management, HRIS administration, and coordination of attendance and leave programs. This role ensures accurate and timely maintenance of employee records, validates payroll processed by our Professional Employer Organization (PEO), and provides strong customer service to employees and leaders. The HR Coordinator plays a key role in driving operational excellence and maintaining compliance with company policies and regulatory requirements. The ideal candidate is organized, analytical, and committed to delivering high-quality HR support in a fast-paced environment.

HR Operations & Data Management
# Maintain, audit, and update employee records, HRIS data, and organizational databases with a high degree of accuracy, confidentiality, and data integrity.
# Track and monitor employee attendance, leave balances, and time-off requests in alignment with company policies and applicable federal and state regulations.
# Manage end-to-end onboarding and offboarding processes, including document collection, system setup/termination, and coordination with internal stakeholders and the PEO to ensure a seamless employee experience.


Payroll & Benefits Support

# Compliance & HR Program Support

# Assist with the development, maintenance, and audit of HR compliance documentation, policies, and required regulatory reporting.
# Support HR initiatives such as performance management cycles, training coordination, employee engagement activities, and internal communications.
# Participate in audits, cross-functional HR projects, and continuous improvement efforts to enhance overall HR effectiveness and operational efficiency.
# Perform other duties and responsibilities as assigned by the supervisor or HR leadership.


2+ years of HR experience (experience working with a PEO is a plus).
#2+ years of payroll administration experience.
# Strong proficiency in Microsoft Office applications (Excel, Word, PowerPoint, Outlook) with the ability to prepare accurate spreadsheets, reports, and presentations.
# Ability to handle confidential information with discretion and professionalism.


Prior HR and payroll support experience within a GMP environment with exempt and nonexempt populations.
# Experience with advanced HRIS platforms (e.g., Workday, UKG, ADP Workforce Now) and the ability to work efficiently across multiple systems.
# Strong understanding of payroll practices, wage and hour regulations, and timekeeping requirements for hourly and shift-based workforces.
# Experience supporting HR or payroll audits, compliance reviews, or data integrity checks.
# Strong attention to detail with consistent accuracy in data entry, reporting, and operational tasks.
# Commitment to providing timely, customer-focused support to employees, managers, and cross-functional partners.
# Interest in identifying opportunities to streamline workflows, improve processes, and enhance HR operational efficiency.
# Intermediate to advanced Excel skills, including use of formulas, VLOOKUP, pivot tables, and data filters.


Bachelor’s degree required.


Comprehensive paid time off, including holidays, vacation, and additional leave benefits
# Health, dental, and vision insurance coverage
# Life insurance, matched retirement savings plan, wellness program, and short- and long-term disability benefits
# Hybrid work flexibility may be available based on business needs


No relocation benefits will be provided.

Ability to travel in the US and globally.
# Travel Percentage: 0-10%.
# Celltrion is an EEO/Affirmative Action Employer and does not discriminate on the basis of age, race, color, religion, gender, sexual orientation, gender identity, gender expression, national origin, protected veteran status, disability or any other legally protected status.