Outsourced Accounting Services (OAS) Senior Accountant

Job Details: Job Location: Virginia Office

• Fairfax, VA, Position Type: Full Time, Education Level: 4 Year Degree, Salary Range: $85000.00 - $95000.00Salary, Travel Percentage: None, Job Category: Accounting, 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 Qualifications:
• Bachelor’s degree in Accounting or related field; CPA license or progress toward CPA preferred
• 3–6+ years of progressive accounting experience, preferably in public accounting or a multi-client environment
• Experience with month-end close and financial reporting processes
• Proficiency with leading accounting platforms such as QuickBooks and/or Sage Intacct, along with working knowledge of CAS technology tools (e.g., BILL, Ramp, and other cloud-based accounting and workflow platforms) Required Skills and Competencies Technical Expertise
• Strong understanding of general ledger accounting, reconciliations, and GAAP-based financial reporting
• Ability to manage month-end close and produce accurate, timely financial statements
• Proficiency in Microsoft Excel with the ability to analyze and interpret financial data
• Experience with cloud-based accounting and workflow platforms in a CAS environment
• Detail-oriented with strong problem-solving skills Client Service & Professional Skills
• Strong verbal and written communication skills
• Professional presence with the ability to build trusted client relationships
• Ability to clearly communicate financial information to non-technical stakeholders
• Client-focused with a commitment to responsiveness and quality Leadership & Collaboration
• Ability to work independently and collaboratively in a team environment
• Strong organizational and time management skills with the ability to manage multiple priorities
• Demonstrated ownership, accountability, and initiative
• Ability to support and mentor junior staff Why Join Gross Mendelsohn?
• Join a respected independent firm committed to strategic growth
• Opportunity to work across a diverse client base and gain exposure to both operational accounting and advisory work
• Enjoy a collaborative, team-oriented culture
• Competitive compensation and comprehensive benefits package
• Free parking at both Baltimore and Fairfax locations
• Hybrid work flexibility Work Environment This role offers a hybrid work environment. The OAS Senior Accountant will be expected to work in the office or attend client meetings as business needs require, particularly for client service, team leadership, and planning engagements. Physical Requirements Ability to sit for extended periods, lift up to 20 pounds, and manage physical files and documentation as needed. Join Us If you are an accounting professional who thrives in a dynamic, client-focused environment, we encourage you to apply. Gross Mendelsohn is an equal opportunity employer committed to fostering a respectful and inclusive workplace.