Part-Time Payroll Coordinator / HR Assistant (Hybrid - Pasadena, CA)

Hybrid - Pasadena, CA | 20 Hours per Week | Non-Exempt | $22 - $26/hour

Payroll Processing

• Payroll Compliance
• Employee
• HR Administration
• HRIS

Do you enjoy working with payroll, solving payroll-related issues, and ensuring employees are paid accurately and on time?

Missionwell is seeking a detail-oriented Payroll & HR Assistant to support payroll processing, payroll compliance, employee administration, and HR operations for Missionwell and our nonprofit business partners. This role is ideal for someone who enjoys balancing payroll execution with employee support and administrative coordination.

What You'll Do

Payroll (Primary Focus)

• Process payroll for assigned business partners with accuracy, timeliness, and attention to compliance requirements.
• Research and help resolve payroll discrepancies, tax notices, garnishments, adjustments, and agency correspondence.
• Support payroll system implementations, payroll data audits, testing, and vendor coordination.
• Prepare payroll-related reports and documentation.
• Support workers' compensation audits, payroll reconciliations, and audit requests.
• Maintain payroll records and supporting documentation.
• Monitor payroll deadlines and ensure timely completion of payroll-related tasks.

HR Administration

• Coordinate employee, offboarding, employment documents, and employee communications.
• Administer background checks and track hiring documentation.
• Maintain personnel files, training records, certifications, and compliance documentation.
• Manage HR and payroll inboxes and respond to employee questions.
• Support HR compliance tracking and employee recordkeeping.

Administrative & Operations Support

• Maintain HR and payroll workflows within Basecamp and other systems.
• Organize documentation across SharePoint, Google Drive, and business platforms.
• Assist with system access requests, phone system administration, and operational processes.
• Collaborate with HR, Accounting, and Operations teams to support client needs.

Why Join Missionwell?

At Missionwell, we partner with organizations that make a difference in their communities. We believe great HR and Payroll processes support great missions. You'll join a supportive team that values collaboration, continuous learning, integrity, and exceptional client service. In this role, you'll get a hybrid work environment with flexibility, exposure to multiple organizations and payroll platforms, opportunity to build expertise in payroll, HR, compliance, and operations, and get to do meaningful work that actually makes a difference in the world and in your local community.