Assistant Office Manager (Law Firm Experience)

SourcePro Search, LLC; New York (NY); Hybrid; USD 81,000 - 99,000; Full time

Benefits offered by this job

Hybrid schedule

Professional growth

Job summary

SourcePro Search, LLC, in Midtown Manhattan, is seeking an organized and proactive Assistant Office Manager for a hybrid role (3 days in-office). You will support the Office Manager and Managing Partners with high-level administrative and operational tasks, and oversee billing and financial processes.

The ideal candidate has 3–5 years of law firm or professional services office administration experience, proficiency in QuickBooks, Timeslips, Outlook, Word and Excel, and strong communication

Qualifications

• 3–5 years of law firm or professional services office administration experience.
• Experience with billing, AP, AR, and collections.
• Tech-savvy with QuickBooks, Timeslips, Outlook, Word and Excel.

Responsibilities

• Support the Office Manager and Managing Partners with administrative tasks.
• Handle monthly billing, posting client expenses and LEDES1998 client bills.
• Manage accounts payable, receivable, collections, deposits, and trust accounts.
• Communicate with vendors and monitor invoice status.
• Oversee expense reimbursements and payroll coordination assistance.
• Help coordinate HR and benefits administration and onboarding.
• Maintain file management systems using FileVine and provide general office support.
• Generate regular administrative reporting for firm leadership.

Skills

Billing and accounts management

Office administration

Vendor management

Communication skills

Discretion and confidentiality

Tools

QuickBooks

Timeslips

Outlook

Word

Excel

FileVine

Job description

Assistant Office Manager

Location: Midtown NYC (Hybrid – 3 Days In-Office)
Salary: Up to $90,000
Industry: Law Firm

SourcePro Search is partnering with a respected and energetic mid-size law firm in Midtown Manhattan to find a sharp, detail-oriented Assistant Office Manager. This is an excellent opportunity for someone with a strong foundation in law firm billing, AP/AR, and office operations who’s ready to step into a key leadership support role.

The right candidate is organized, proactive, flexible, and capable of juggling priorities while keeping a calm, professional demeanor. This role offers a collaborative hybrid schedule and an opportunity to truly grow with a firm that values both structure and innovation.

What You’ll Do:

• Support the Office Manager and Managing Partners with high-level administrative and operational tasks

• Handle monthly billing, including posting client expenses in Timeslips and QuickBooks, and preparing LEDES1998-compliant client bills

• Manage accounts payable, receivable, collections, deposits, and trust fund accounts

• Communicate directly with vendors and monitor invoice status and resolution

• Oversee expense reimbursements and assist with payroll coordination

• Help coordinate HR and benefits administration, and support onboarding and training of new hires

• Maintain proper file management systems using FileVine and assist with general office support

• Generate regular administrative reporting for firm leadership

What You’ll Bring:

• 3–5 years of law firm or professional services office administration experience

• Prior hands-on experience with billing, AP, AR, and collections

• Tech-savvy with strong proficiency in QuickBooks, Timeslips, Outlook, Word, and Excel

• Ability to juggle multiple responsibilities, work independently, and remain composed under pressure

• Excellent written and verbal communication skills

• A team-oriented mindset with a respectful and professional approach when working with all levels of staff and leadership

• Discretion and trustworthiness in handling confidential data

• Experience with FileVine, HR, or benefits is a plus

If you're seeking a growth-oriented support role in a fast-paced, highly collaborative legal environment, this opportunity could be the perfect fit.