Outsourced Accounting Services (OAS) Senior Accountant

Gross Mendelsohn, one of the Mid-Atlantic’s leading independent CPA and advisory firms, is seeking an experienced Senior Accountant to join our growing Outsourced Accounting Services (OAS) practice.
This is a highly visible, client-facing role focused on serving a diverse portfolio of businesses and nonprofit organizations. The OAS Senior Accountant will act as a trusted financial partner, delivering timely, accurate, and decision-useful financial information while supporting clients’ day-to-day accounting operations.
This role is ideal for accounting professionals who enjoy variety, ownership, and building long-term client relationships.
Key Responsibilities
Client Accounting & Financial Reporting
Manage monthly, quarterly, and year-end close processes for assigned clients
Prepare and review financial statements to ensure accuracy and timeliness
Perform and review balance sheet reconciliations and general ledger activity
Maintain audit-ready financial records and documentation
Client Relationship Management
Serve as a primary point of contact for assigned clients
Communicate financial results and insights clearly
Build strong, long-term client relationships
Transaction Oversight & Process Improvement
Review accounting transactions and ensure proper coding
Identify and implement process improvements
Support onboarding of new clients
Compliance & Cross-Functional Support
Prepare and review 1099s, sales tax filings, and related compliance items
Support audit engagements and collaborate with tax teams
Team Leadership & Development
Train and mentor associates and interns
Review work and provide guidance

Work arrangement
Yes