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.

• 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

• Serve as a primary point of contact for assigned clients
• Communicate financial results and insights clearly
• Build strong, long-term client relationships

• Review accounting transactions and ensure proper coding
• Identify and implement process improvements
• Support onboarding of new clients

• Prepare and review 1099s, sales tax filings, and related compliance items
• Support audit engagements and collaborate with tax teams

• Train and mentor associates and interns
• Review work and provide guidance