Fractional Payroll Specialist (Part-Time | Hybrid)

About the Role:
Mosaic Human Capital Solutions is expanding and seeking a Fractional Payroll Specialist to join our growing team. In this role, you’ll be deployed to support clients, primarily small to mid-sized businesses, with end-to-end payroll administration and process improvement across payroll and HR functions.

This is a part-time, hybrid position offering significant flexibility, but candidates must reside in the San Antonio, TX area for occasional onsite work with clients.

Key Responsibilities:

• Manage and process client payrolls accurately and on time using ADP or similar systems; ensure proper handling of deductions, taxes, and reporting.

• Evaluate existing payroll processes (many of which may be manual) and recommend improvements to enhance accuracy, efficiency, and compliance.

• Serve as a liaison between clients and Mosaic to provide responsive, consultative HR/payroll support.

• Assist with onboarding, HRIS updates, and other HR administrative tasks as needed.

• Stay up to date with applicable federal and state employment laws and payroll regulations.

• Provide basic training and support to client HR/payroll contacts on system use and improved workflows.

Required Qualifications:

• San Antonio, TX-based, with the ability to travel locally to client sites when needed.

• 3+ years of hands-on payroll experience, including direct use of ADP or comparable platforms.

• Strong understanding of payroll fundamentals, including benefit deductions, garnishments, tax filings, and wage/hour compliance.

• Proven ability to identify inefficiencies in manual payroll processes and implement improvements.

• Excellent organizational skills, attention to detail, and ability to manage multiple client accounts.

• Strong interpersonal skills and comfort working directly with client stakeholders.

Preferred:

• Experience working in a consulting or multi-client environment.

• Familiarity with broader HR functions (e.g., benefits administration, onboarding, HRIS).

Position Details:

• Part-time: ~20–30 hours/week to start, with potential to grow over time (if desired).

• Hybrid: Mix of remote work and local travel to client sites.

• Flexibility in scheduling with deliverables-based accountability.

Mosaic Human Capital Solutions is an equal-opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, sexual orientation, national origin, age, disability, veteran status, or any other legally protected status.

Applicants must be authorized to work in the United States. Employment offers are contingent upon successfully completing background checks and any applicable pre-employment requirements.