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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