Manager, US Benefits

Alnylam Pharmaceuticals•Cambridge, MA

12d•Hybrid

About The Position

The Manager, US Benefits oversees the administration and delivery of Alnylam’s U.S. benefits and leave programs, ensuring accuracy, regulatory compliance, and a high-quality employee experience. This role partners closely with vendors, HR colleagues, and our broker to deliver reliable, employee‑focused service in a fast‑paced environment. This position will report to the Director, US Benefits. This is a hybrid position and will primarily be based in Cambridge, MA.

Requirements

Bachelor’s degree in HR, Business, or related field (or equivalent HR experience).
5+ years of U.S. benefits administration experience, including LOA programs exposure.
Knowledge of ERISA, ACA, HIPAA, and federal/state regulations.
Experience partnering with third‑party vendors and brokers.
Experience with SAP SuccessFactors (benefits configuration, data review, workflow coordination).
Strong communication, relationship‑building, and problem‑solving skills.

Responsibilities

Manage U.S. leave programs (FMLA, parental, disability) and partner with the Leave/ADA vendor to ensure accurate, compliant, employee‑focused case handling.
Coordinate closely with People Relations, HRBPs, Payroll, Legal, and vendors to support timely case updates and communication.
Oversee the day‑to‑day administration of medical, dental, vision, life, disability, HSA/FSA, COBRA, and retirement plans while maintaining service quality.
Ensure compliance with ERISA, ACA, HIPAA, Section 125, and federal/state requirements, supporting audits, 5500 filings, and nondiscrimination testing.
Build strong vendor and broker partnerships and act as an escalation point for complex employee inquiries.
Partner with HRIS to ensure accurate benefits data, testing, system maintenance, and reporting in SAP SuccessFactors.
Lead annual Open Enrollment planning, communications, testing, data validation, and reconciliation.
Develop clear, employee‑friendly benefits communications, support wellness initiatives, and provide direct guidance to employees and managers.