Part-Time Payroll Specialist

Custom Software Systems Inc. • Remote • Contractor • $18–$28 / hour

Posted on Tue, Sep 1, 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

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