Demo

PT Payroll Specialist

Custom Software Systems Inc.
Leesburg, VA Contractor
POSTED ON 9/10/2026
AVAILABLE BEFORE 11/10/2026

Custom Software Systems Inc. is seeking an experienced Part-Time ADP Payroll Specialist to support our growing organization. The ideal candidate has hands-on experience administering payroll in ADP and understands the practical requirements of expanding payroll operations into new states.
This is a hands-on role for someone who can independently manage payroll activities, troubleshoot issues, and ensure employees are paid accurately and on time. The right candidate will reside in a HUBZone.

Please confirm on the HUBZone map before applying: https://maps.certify.sba.gov/hubzone/map#center=44.722800,-103.249700&zoom=4


Responsibilities
•    Process and administer payroll using ADP.
•    Maintain employee payroll records, deductions, tax elections, and other payroll information.
•    Process new hires, terminations, compensation changes, bonuses, and other payroll adjustments.
•    Set up payroll in a new state, including researching and coordinating applicable state payroll tax, withholding, unemployment, and employer registration requirements.
•    Coordinate with ADP to establish new-state payroll and tax accounts and ensure the state is properly configured in the payroll system.
•    Ensure accurate state and local tax withholding and reporting.
•    Review payroll reports and reconcile payroll data to identify and correct discrepancies.
•    Support federal, state, and local payroll tax filings and compliance.
•    Manage multi-state payroll requirements as the company expands.
•    Respond to employee questions regarding payroll, deductions, taxes, and pay statements.
•    Support year-end payroll activities, including W-2 preparation and reconciliation.
•    Maintain accurate payroll documentation and support internal and external audits.
•    Maintain confidentiality of employee compensation and personal information.
•    Coordinate with HR, accounting, and management on payroll-related matters.
•    Identify opportunities to improve payroll processes and controls.


Citizenship
•    US Citizenship 


Required Qualifications
•    Demonstrated hands-on ADP payroll experience.
•    Experience processing payroll from start to finish.
•    Experience with multi-state payroll.
•    Experience adding or implementing payroll in a new state, including state registration, tax setup, withholding, and payroll-system configuration.
•    Strong understanding of federal and state payroll requirements.
•    Strong Excel skills and attention to detail.
•    Ability to work independently and manage confidential information.
•    Excellent organizational and problem-solving skills.


Preferred Qualifications
•    Experience with ADP Workforce Now.
•    Experience supporting a small or growing government contractor.
•    Experience establishing payroll in multiple states.
•    FPC or CPP certification.
•    HRIS/payroll implementation experience..


Compensation & Benefits  
•    Wage Range: $18-28 -Negotiable
•    General Benefits: Custom Software Systems, Inc. offers our employees a competitive benefits package that may include:

    Health insurance plans 
    Health Savings Account (HSA)
    Dental
    Vision
    Long-term disability
    Short-term disability
    Basic term life insurance
    Supplemental term life insurance for employees, spouses, and dependents
    Simple IRA
    Parking/Commuting expense reimbursement
    Training/Education

Hourly Wage Estimation for PT Payroll Specialist in Leesburg, VA
$35.00 to $44.00
If your compensation planning software is too rigid to deploy winning incentive strategies, it’s time to find an adaptable solution. Compensation Planning
Enhance your organization's compensation strategy with salary data sets that HR and team managers can use to pay your staff right. Surveys & Data Sets

What is the career path for a PT Payroll Specialist?

Sign up to receive alerts about other jobs on the PT Payroll Specialist career path by checking the boxes next to the positions that interest you.
Income Estimation: 
$67,313 - $85,132
Income Estimation: 
$81,126 - $105,394
Income Estimation: 
$67,313 - $85,132
Income Estimation: 
$81,126 - $105,394
Employees: Get a Salary Increase
View Core, Job Family, and Industry Job Skills and Competency Data for more than 15,000 Job Titles Skills Library

Job openings at Custom Software Systems Inc.

  • Custom Software Systems Inc. Washington, DC
  • Custom Software Systems, Inc. (CSS) is seeking a highly skilled Senior Cloud Security Specialist (API) to support a critical data access management initiat... more
  • 2 Days Ago

  • Custom Software Systems Inc. Washington, DC
  • Custom Software Systems Inc. is seeking a senior engineer to deliver database server administration for our client's on-premises SQL Server and PostgreSQL ... more
  • 13 Days Ago

  • Custom Software Systems Inc. Washington, DC
  • Custom Software Systems, Inc. (CSS) is seeking a Senior Product Manager to lead the strategy and development of a cloud-based research computing platform s... more
  • 16 Days Ago

  • Custom Software Systems Inc. Washington, DC
  • Custom Software Systems, Inc. (CSS) is seeking a DevSecOps Engineer to support our clients' enterprise cybersecurity engineering program. You'll own the se... more
  • 16 Days Ago


Not the job you're looking for? Here are some other PT Payroll Specialist jobs in the Leesburg, VA area that may be a better fit.

  • MyEyeDr. Vienna, VA
  • Description About the role We are seeking a reliable and detailed Payroll Specialist to support accurate and timely payroll operations for our organization... more
  • 18 Days Ago

  • JEDA, LLC Sterling, VA
  • Jeda, LLC contact@jedallc.com Location: Sterling, VA Payroll Specialist I Position Summary We are seeking a detail-oriented and dependable Payroll Speciali... more
  • 18 Days Ago

AI Assistant is available now!

Feel free to start your new journey!