Sr. Payroll & Benefits Specialist

MEVION MEDICAL SYSTEMS INC•Littleton, MA

1d•$90,000 - $105,000•Onsite

About The Position

The Senior Payroll & Benefits Specialist manages accurate and timely payroll processing and benefits administration. The role covers U.S. multi-state payroll compliance, international payroll coordination, and Employer of Record (EOR) payroll setup and execution. As part of the People Operations team, the specialist also supports payroll reporting and audits, leave administration, employee onboarding and offboarding, and other departmental projects. This position is fully onsite at the corporate office in Littleton, Massachusetts.

Requirements

At least 5 years of payroll and benefits administration experience, including hands-on U.S. multi-state payroll compliance.
Experience coordinating international payrolls and implementing and processing payroll through EOR providers.
Experience with payroll reporting, 401(k) and workers’ compensation audit support, and leave-of-absence coordination with TPAs.
Strong payroll/HRIS systems proficiency and Excel skills.
Attention to detail and ability to manage sensitive information.
Strong communication, organizational, and problem-solving skills.
Ability to sit or stand for long periods of time.
Ability to use standard office equipment, including a laptop, phone, and copier.
Ability to walk through the factory environment safely.

Responsibilities

Manage end-to-end U.S. multi-state payroll, including payroll changes, deductions, reconciliations, and coordination of federal, state, and local tax compliance.
Coordinate international payrolls with local providers, ensuring accurate inputs, timely processing, and resolution of payroll issues.
Set up and execute payroll through EOR partners, including employee setup, payroll approvals, funding coordination, and ongoing reconciliation.
Administer employee benefits, including enrollments, qualifying life events, terminations, open enrollment, and payroll deductions.
Prepare and reconcile payroll reports; partner with Finance on payroll journal entries, accruals, and related reporting.
Support 401(k), workers’ compensation, and other payroll and benefits audits by preparing records, reconciling data, responding to requests, and resolving discrepancies.
Coordinate leave-of-absence administration with third-party administrators (TPAs), including applications, supporting documentation, payroll and benefits adjustments, employee communications, and applicable compliance requirements.
Support workers’ compensation administration, including applications, payroll reporting, coordination with carriers and TPAs, and related compliance documentation.
Support onboarding and offboarding, including HRIS updates, benefits communications, and final-pay coordination.
Maintain accurate, confidential employee records; respond to payroll and benefits inquiries; and support compliance activities, process improvements, and other People Operations projects.