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

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

• Payroll Compliance
• Employee Onboarding
• 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 onboarding, 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.

Requirements What We’re Looking For We’re looking for someone who thrives in a hybrid environment, enjoys payroll and compliance work, has a strong eye for detail, and takes pride in delivering accurate, high-quality results. The ideal candidate is organized, comfortable managing multiple priorities, enjoys solving problems, and is eager to continue building a career in payroll and HR operations.

Required Qualifications

• 1+ year of payroll, accounting, HR, or administrative experience.
• Strong attention to detail and ability to work accurately with confidential data.
• Excellent organizational, problem-solving, and follow-through skills.
• Strong customer service and communication skills.
• Ability to manage multiple deadlines and priorities.
• Proficiency with Microsoft 365, including Excel, Outlook, Word, and Teams.

Preferred Qualifications

• Payroll processing experience.
• Experience with payroll systems such as Gusto, Paylocity, ADP, Paychex, or similar platforms.
• Experience with employee onboarding and HR administration.
• Experience with HRIS, timekeeping, or workforce management systems.
• Nonprofit experience.
• Familiarity with California payroll and employment practices.

What Success Looks Like

• Delivering accurate payrolls and reports.
• Meeting deadlines consistently.
• Maintaining strong internal processes and documentation.
• Building trusted relationships with clients and teammates.
• Helping improve processes and supporting team development.

Work Location This position is based in Pasadena, California and follows a hybrid schedule that combines in-office collaboration with remote work flexibility.

Applicants must be legally authorized to work in the United States. Missionwell is not able to s…