Part-Time AR/Billing Assistant, (ACI)
About The Position
We are seeking a detail-oriented and reliable Part-Time AR/Billing Assistant to support our accounting operations. This role will be responsible for assisting with accounts receivable functions, including preparing and sending invoices, tracking payments, reconciling accounts, and following up on outstanding balances. The AR/Billing Assistant will also provide administrative support to ensure accurate and timely billing processes. This is a part-time position ideal for someone who is organized, dependable, and comfortable working in a professional services environment. PLEASE NOTE: This role is based out of ACI's office in Chino Hills, CA and requires regular in-person attendance. We value collaboration and believe that working together on-site fosters strong teamwork, communication, and innovation.
Requirements
- 1–2 years of experience in accounts receivable, billing, or related accounting support role, (professional services experience a plus).
- Strong attention to detail with a high degree of accuracy in data entry and recordkeeping.
- Proficiency in Microsoft Office (especially Excel and Outlook); experience with Sage Intacct or similar accounting software preferred.
- Ability to manage multiple tasks and meet deadlines in a part-time, flexible environment.
- Strong written and verbal communication skills for interacting with clients and internal team members.
- Dependable, self-motivated, and able to work independently with minimal supervision.
- Understanding of confidentiality and professionalism when handling financial and client information.
Nice To Haves
- professional services experience a plus
- experience with Sage Intacct or similar accounting software preferred
Responsibilities
- Accurately apply customer payments (Checks and ACH) and post transactions to the appropriate accounts.
- Monitor accounts for delinquency and follow up on outstanding balances via phone and email.
- Reconcile payments, resolve discrepancies, and update records as needed.
- Assist with preparing and sending customer invoices.
- Respond to customer inquiries professionally and promptly.
- Maintain accurate AR records and organized supporting documentation.
- Support other administrative and finance-related tasks as needed.
- Other duties as assigned.
Benefits
- Flexible Workplace – Hybrid and remote options available for many roles.
- Unlimited PTO – Competitive paid time off, including flexible & unlimited options.
- Inclusive Environment – A culture that values diversity, collaboration, and respect.
- Growth Opportunities – Support for ongoing learning and career development.
- Comprehensive Benefits – Health, dental, vision, life, and disability coverage.
- Workplace Perks – Incentive bonus programs, flexible hours, & more.
- Specific benefits and programs may vary by partner and position.
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What This Job Offers
Job Type
Part-time
Career Level
Entry Level
Education Level
No Education Listed
Number of Employees
51-100 employees
