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.

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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

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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

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

Apply today through SourcePro Search to be considered for this exciting role!