HR/Payroll Administrative Assistant

ADP, Inc.; California (MO); On-site; USD 29,000 - 33,000; Full time

Job summary

ADP, Inc. in Valencia, CA is seeking an HR/Payroll Administrative Assistant to support onboarding, employee data management, and payroll processing on a bi-weekly schedule.

You will liaise between HR and employees and help coordinate events and benefits enrollment while ensuring accurate records. The ideal candidate has an associate degree or certification, 1–2 years in HR, and hands-on experience with ADP Workforce Now and MS Office.

Qualifications

• HRIS/payroll platforms experience required.
• Knowledge of I-9 compliance and verification.
• Strong organizational and multi-location coordination skills.
• Excellent written and verbal communication abilities.
• Discretion with confidential employee information.
• Proficiency with Microsoft Office (Excel, Word, Outlook).
• Strong time management in a fast-paced HR environment.
• Teamwork across locations and departments.

Responsibilities

• Maintain personnel files, records, and HR databases.
• Answer employee questions on policies, benefits, and hiring.
• Process payroll using ADP Workforce Now and audit benefits.
• Complete Form I-9 and maintain documentation.
• Assist with onboarding, offboarding, and background checks.
• Support recruitment and interview coordination.
• Plan and execute benefits enrollment and employee events.
• Perform other duties as assigned.

Skills

HRIS/payroll platforms

I-9 compliance

Organizational skills

Written and verbal communication

Confidentiality

Microsoft Office Suite

Time management

Cross-location coordination

Education

Associate degree or certification

Tools

ADP Workforce Now

Microsoft Office Suite

Excel

Word

Outlook

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

HR/Payroll Administrative Assistant

Full Time Valencia, CA, US

Salary Range: $21.00 To $24.00 Hourly

Position Summary

HR/Payroll Administrative Assistant duties involve a wide range of support activities inside our HR department, from onboarding new hires and maintaining our employee database to coordinating employee events and engagement initiatives. This role plays a key part in supporting the full employee lifecycle, with a strong emphasis on payroll processing on a bi-weekly payroll processes. An important part of the role is acting as the liaison between HR and employees. The ideal candidate is comfortable working independently, communicating effectively with employees, supervisors, and leadership, and takes pride in accuracy and follow-through.

Duties & Responsibilities

• Maintains accurate and up-to-date personnel files, records, documentation, and database.
• Answers frequently asked questions from employees relative to standard policies, benefits, hiring processes, etc.; refers more complex questions to HR Business Partner or management.
• Completes payroll functions including payroll processing through ADP Workforce Now, entering employee PTO requests, auditing benefits, fixing processing errors, and distributing checks.
• Completes Forms I-9, verifies I-9 documentation and maintains I-9 files.
• Assists with new-employee background checks and drug screening.
• Assists with processing of onboarding and offboarding paperwork (i.e. onboarding, new hire orientation, and training sessions, status change forms, 401k Withdrawal form, benefits booklets, etc.)
• Assists with recruitment and interview process.
• Assists with planning and execution of special events such as benefits enrollment, organization-wide meetings, employee recognition events, holiday parties, and retirement celebrations.
• Performs other duties as assigned.

Travel Requirement

Occasional travel required, including quarterly trips to the San Antonio, TX facility to review HR processes, conduct in-person check-ins with employees, and support Open Enrollment.

Required Skills

• Proficiency with HRIS/payroll platforms (e.g., ADP Workforce Now) for onboarding, payroll processing, and employee data management
• Working knowledge of I-9 compliance and employment eligibility verification requirements
• Strong organizational skills with the ability to manage multi-location HR coordination
• Excellent written and verbal communication skills for employee relations and internal communications
• High attention to detail, particularly with compliance-sensitive documentation (garnishments, audits, employee records)
• Ability to maintain confidentiality and handle sensitive employee information with discretion
• Proficiency in Microsoft Office Suite (Excel, Word, Outlook)
• Strong time management skills with the ability to prioritize tasks in a fast-paced environment
• Collaborative mindset with the ability to work effectively across departments and locations

Education & Experience

• Associated degree and/or certification in related field
• 1-2 years of experience in Human Resources
• Basic knowledge and understanding of human resource principles, practices, and procedures.
• Hands-on experience with payroll processing; ADP Workforce Now experience strongly preferred
• Proficient with Microsoft Office Suite or related software

Physical Demands

• Standing: Over 1/3 of the workday
• Walking: 1/3 of the workday
• Sitting: 2/3 of the workday
• Use of hands/fingers: Over 2/3 of the workday
• Talk or hear: Over 2/3 of the workday
• Lifting Requirements: No more than 10-15 lbs
• Vision Requirements: Close vision, distance vision and depth perception. Must be able to read a computer screen and documents.

Why Join Us

• Competitive wage based on qualifications
• Comprehensive benefits package (health coverage, paid time off, and more).
• Professional Development: Budget for certifications, training, and conferences to build your expertise
• Clear Growth Path: Opportunity to advance as you demonstrate results and expand your skill set
• Collaborative Environment: Work closely with a supportive Operations team
• Learning Culture: We're committed to providing training and mentorship as you grow into this role; curiosity and a drive to learn are more important than knowing everything on day one.