401(k) Plan Administrator

Ultimate Staffing Services; Fountain Valley (CA); On-site; USD 48,000 - 52,000; Part time

Job summary

Ultimate Staffing Services in Fountain Valley, CA is seeking a 401(k) Plan Administrator to oversee day-to-day retirement plan operations, compliance, payroll integration, and vendor management.

The role requires a bachelor's degree and 4+ years in HR, Benefits, Payroll, or HRIS, with experience in Fidelity and Form 5500 compliance. This temporary assignment is onsite for 2-3 months with potential to hire.

Qualifications

• Bachelor's degree required.
• 4+ years of HR, Benefits, Payroll, or HRIS experience.
• Experience administering 401(k) plans and working with Fidelity.
• Knowledge of Form 5500, retirement plan compliance, and audits.
• ADP experience strongly preferred.
• Strong analytical and reconciliation skills.

Responsibilities

• Own administration of the 401(k) plan, including enrollments, loans, hardships, rollovers, and eligibility tracking.
• Manage ADP-to-Fidelity integration and bi-weekly employee data uploads.
• Reconcile payroll deductions and retirement plan contributions.
• Coordinate Form 5500 preparation, review, and filing with external partners.
• Support audits, compliance testing, and ERISA requirements.
• Coordinate 401(k) committee meetings and track action items.
• Serve as backup for payroll, HRIS, and benefits administration.

Skills

Analytical skills

Data reconciliation

Payroll data handling

Attention to detail

Education

Bachelor's degree

Tools

ADP

Fidelity

Job description

Salary: USD35 - USD38 per hour

Job Title: 401(k) Plan Administrator

Location: Fountain Valley, CA (100% Onsite)

Employment Type: Temporary (2-3 months with possible temp to hire)

Compensation: $35–$38/hour

We're seeking an experienced 401(k) Administrator to oversee day-to-day retirement plan operations, compliance, payroll integration, and vendor management for our client’s company.

Key Responsibilities

• Own administration of the 401(k) plan, including enrollments, loans, hardships, rollovers, and eligibility tracking
• Manage ADP-to-Fidelity integration and bi-weekly employee data uploads
• Reconcile payroll deductions and retirement plan contributions
• Coordinate Form 5500 preparation, review, and filing with external partners
• Support audits, compliance testing, and ERISA requirements
• Coordinate 401(k) committee meetings and track action items
• Serve as backup for payroll, HRIS, and benefits administration

Qualifications

• Bachelor's degree required
• 4+ years of HR, Benefits, Payroll, or HRIS experience
• Experience administering 401(k) plans and working with Fidelity
• Knowledge of Form 5500, retirement plan compliance, and audits
• ADP experience strongly preferred
• Strong analytical and reconciliation skills

Ideal Background

401(k) Administration, Retirement Benefits, Fidelity, ADP, Form 5500, Payroll Reconciliation, ERISA Compliance.