Senior Accounting Manager

Senior Accounting Manager

We are seeking a highly motivated and detail-oriented Senior Accounting Manager to lead critical accounting initiatives focused on accounting tasks related to ERP system integrations, Transition Services Agreements (TSAs), process improvements, and balance sheet cleanup for a recent $1B acquisition. This role is ideal for someone who thrives in a dynamic environment and enjoys tackling complex projects that enhance the scalability, accuracy, and efficiency of the accounting function.

This individual will partner cross-functionally with key leadership in Finance, IT, Operations, and external stakeholders to drive key transformation efforts, including post-acquisition integrations, ERP/system implementations, and remediation of historical accounting issues.

• Support M&A related integration activities, including driving the discovery and design phase to transitioning accounting activities into our team
• Lead accounting support for a multi-phase ERP implementation within a complex carve-out environment, including navigating interim-state processes, data inconsistencies, and establishing controls between system rollouts
• Partner with integration, finance, IT, legal, and operations teams to align control frameworks, policies, and procedures once integrated into Thermo Fisher ERP
• Review and analyze monthly flat file entries (until ERP implementation), ensuring completeness and accuracy of financial information and investigating variances and data fluctuations
• Serve as the accounting lead for the Transition Services Agreements (TSAs), including preparation, review, and oversight of settlement statements and related processes
• Monthly monitoring of TSA activity and invoices between the local jurisdictions and proactively identify, investigate, and resolve payment issues, billing discrepancies with TSA Invoices
• Participate in developing and implementing plans to transition accounting functions from the TSA to internal teams or shared services.
• Evaluate and design control design and operating effectiveness, particularly in newly integrated processes and systems.
• Lead remediation efforts for control deficiencies, ensuring timely and sustainable resolution and ensure timely closure of commitments made in representation letters
• Serve as a key liaison with external auditors and internal audit for the conveyed and commingled entities.
• Develop documentation for processes, integrations, and accounting treatments to support scalability and audit readiness
• Oversee periodic testing and analytics to validate the effectiveness of revenue and inventory cutoff controls.
• Ensure accounting policies and procedures are consistently applied across newly integrated or evolving business units

Team Leadership & Capability Building

• Establish clear priorities, accountability, and performance standards during periods of change.
• Promote a strong culture of ethics, compliance, and continuous improvement.
• Leverage data, technology, and best practices to modernize the control environment.

• Bachelor's degree in Accounting, Finance, Business, or a related field.
• 8–12+ years of experience in Accounting, internal controls, or Integration.
• Demonstrated experience supporting mergers, acquisitions, or large-scale integrations.
• Strong knowledge of internal control best practices.
• Proven experience leading complex accounting projects (e.g., ERP implementations, M&A integrations, system conversions)
• Proven ability to lead complex initiatives in fast-paced, evolving environments.

The salary range estimated for this position based in Massachusetts is $–$. This position may also be eligible to receive a variable annual bonus based on company, team, and/or individual performance results in accordance with company policy. We offer a comprehensive Total Rewards package that our U.S. colleagues and their families can count on, which includes:

• A choice of national medical and dental plans, and a national vision plan, including health incentive programs
• Employee assistance and family support programs, including commuter benefits and tuition reimbursement
• At least 120 hours paid time off (PTO), 10 paid holidays annually, paid parental leave (3 weeks for bonding and 8 weeks for caregiver leave), accident and life insurance, and short- and long-term disability in accordance with company policy
• Retirement and savings programs, such as our competitive 401(k) U.S. retirement savings plan
• Employees' Stock Purchase Plan (ESPP) offers eligible colleagues the opportunity to purchase company stock at a discount