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Accounting Assistant

Job in Fairfax, Fairfax County, Virginia, 22032, USA
Listing for: Mandex Inc
Full Time position
Listed on 2026-03-13
Job specializations:
  • Administrative/Clerical
    Office Administrator/ Coordinator, Bookkeeper/ Accounting Clerk
  • Accounting
    Accounting Assistant, Office Administrator/ Coordinator, Bookkeeper/ Accounting Clerk, Accounts Receivable/ Collections
Salary/Wage Range or Industry Benchmark: 24.5 - 26 USD Hourly USD 24.50 26.00 HOUR
Job Description & How to Apply Below

Job Title

Accounting Assistant

Job Type

Full-time

Category

Finance

Education

Associate Degree

Location

Mandex Corporate - Fairfax, VA 22033 US (Primary)

Travel

0 - 10%

Job Description

Accounting Assistant

On-site

Salary Range: $24.50-$26.00 per hour

MANDEX currently has a need for a full-time Accounting Assistant to join our team at our Headquarters Office in Fairfax, VA. The Assistant will participate in the maintenance of day-to-day accounting and payroll operations and support our Headquarters personnel. This is a non-exempt position.

Your future duties and responsibilities:
  • Processing accounts payable for vendor purchases, utilities, electronic employee expense reports, check requests, etc., and corresponding with vendors and employees.
  • Preparing and filing for 401(k) contributions, match and loans to Principal.
  • Assisting with monthly reports, data entry, and filing.
  • Inputting timesheet entries for wage determination payments, leave payouts, and other entries.
  • Running AP checks and mailing out checks.
  • Assisting with W2s and 1099s at year end.
  • Assisting with payroll functions such as processing payroll timesheet entries semi-monthly, creating the bank payroll payment file as well as payroll related taxes.
  • Reviewing and processing monthly invoices.
  • Setting up project numbers for new tasks in Deltek CostPoint.
  • Reviewing for accuracy paperwork submitted to the corporate office prior to processing and returning incorrect data for completion.
  • Providing other clerical assistance to Corporate and field offices as needed.
Required qualifications to be successful in this role:
  • Excellent verbal and written communication skills.
  • Excellent interpersonal skills with the ability to manage sensitive and confidential situations with tact, professionalism, and diplomacy.
  • Excellent organizational skills and attention to detail.
  • Proficiency with Microsoft Office Suite and related software.
  • Proficiency with or the ability to quickly learn payroll management, and similar computer applications.
  • Prior working experience with Deltek CostPoint accounts payable, electronic employee expense report and the payroll modules.
  • Minimum of 1 - 3 years of Payroll/ Administrative office experience. Government contractor experience preferred.

Must be a U.S. Citizen.

Benefits we offer:
  • Health insurance
  • Vision insurance
  • Paid time off
  • Employee assistance program
  • Short-term disability
  • Long-term disability
  • Health savings account
  • Flexible spending accounts
  • Basic Life & Disability insurances
  • Voluntary AD&D Insurance
  • Voluntary Accident Insurance
  • Voluntary Critical Illness Insurance
  • 401(k) Retirement Plan (MANDEX, Incoffer pre-tax and post-tax Roth contributions, and match 100% of the first 6% elected contribution)
Additional Information
  • Background Checks & Drug Screening

Security Level: None

MANDEX, Inc. is an Equal Employment Opportunity employer and does not discriminate on the basis of race, national origin, gender, sexual orientation, disability, veterans’ status, age, or other legally protected status.

MANDEX Inc. reserves the right to perform background screening and drug testing prior to extending offers of employment.

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