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Administrative Assistant

Job in Orange, Orange County, California, 92864, USA
Listing for: Robert Half
Full Time, Seasonal/Temporary position
Listed on 2026-09-27
Job specializations:
  • Administrative/Clerical
    Office Administrator/ Coordinator
  • Accounting
    Office Administrator/ Coordinator, Accounts Receivable/ Collections
Job Description & How to Apply Below
Description We are looking for an Administrative Assistant to support a fast-paced billing and office operations environment. This contract opportunity with potential for a permanent role is ideal for someone who thrives on accuracy, organization, and consistent follow-through while managing a high volume of invoicing and related administrative tasks. The person in this role will help keep billing records current, coordinate with internal teams and customers to gather required documentation, and ensure submissions are completed according to client-specific guidelines.

Responsibilities:

- Manage a large daily invoicing workload, handling roughly 50 or more billing transactions with a strong focus on timeliness and accuracy.

- Examine inspection documents, quoted service work, and completed job activity to prepare invoices that reflect the correct billable details.

- Confirm that inspection approvals and supporting paperwork are complete before releasing invoices for processing.

- Communicate with coworkers and customers to obtain missing reports, clarify incomplete billing details, and keep invoicing on schedule.

- Submit invoices through customer billing portals while following each account's specific formatting and documentation requirements.

- Maintain billing logs and tracking spreadsheets to monitor completed work, invoice progress, pending items, and outstanding follow-up needs.

- Investigate rejected invoices, payment questions, and other billing discrepancies, then take appropriate steps to resolve outstanding issues.

- Provide general administrative support that may include data entry, handling inbound calls, and front-office assistance as needed. Requirements - At least 2 years of experience in administrative support, billing, or a closely related office-based role.

- Demonstrated ability to process high-volume data and invoices with strong attention to detail.

- Experience working with spreadsheets, billing records, and document tracking tools in an organized manner.

- Comfortable communicating with internal departments and external customers to resolve documentation or payment issues.

- Ability to manage multiple priorities, meet deadlines, and maintain accuracy in a fast-moving environment.

- Proficiency in administrative tasks such as data entry, answering inbound calls, and supporting general office operations.

- Familiarity with invoice submission processes, collections support, or customer billing portals is preferred. Talent Match®

Robert Half is the world's first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles.

Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app ()  and get 1-tap apply, notifications of AI-matched jobs, and much more.

All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit  for more information.

© 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking "Apply Now," you're agreeing to Robert Half's Terms of Use ()  and Privacy Notice () .
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