Payroll/HR Administrator & Accounting Assistant

New Horizon Medical Solutions LLC.; San Mateo (CA); On-site; USD 65,000 - 88,000; Full time

Job summary

SteelWave is seeking a detail-oriented Payroll/HR Administrator to own multi-state payroll for 75–100 employees and support core HR operations. This role also assists the accounting team, handling payroll transactions, onboarding, and HR reporting.

The candidate should have 2–5 years of payroll processing experience, strong math and confidentiality skills, and be proficient with MS Office. This on-site role offers a hands-on environment with cross-functional responsibilities.

Qualifications

• 2–5 years of payroll processing and time reporting experience.
• HR or recruiting coordination experience is a plus.
• Knowledge of federal and state wage and hour laws; multi-state payroll preferred.
• Strong attention to detail and discretion with confidential information.
• Proficiency in MS Office; comfortable learning new systems.

Responsibilities

• Process multi-state payroll and time reporting for exempt and non-exempt employees, ensuring compliance with policy and wage laws.
• Process payroll transactions including hires, terminations, pay changes, bonuses, garnishments, and benefit adjustments.
• Serve as liaison with TriNet (PEO): maintain system setup, resolve discrepancies, and build reports.
• Prepare HRIS reports for internal and government reporting; support 401(k) reconciliations and audits.
• Coordinate recruiting and onboarding/offboarding, including ATS, I-9s and background checks.
• Support performance reviews, benefits analysis, HR training, and other HR projects; back up administrative staff.
• Assist the accounting team with AP, expense reports, and wire processing.

Skills

Payroll processing

HR administration

Time reporting

Multi-state payroll

Education

Bachelor's degree in related field

Tools

MS Office

Excel

Job description

Payroll/HR Administrator & Accounting Assistant

About SteelWave

SteelWave is a vertically integrated real estate investment manager, owner, and operator with a commercial portfolio across the western U.S., including Northern and Southern California, Denver, Seattle, and Austin. Since 1973, we have acquired and developed more than $11 billion in real estate.

The Role

We are seeking a detail-oriented Payroll/HR Administrator to own multi-state payroll for 75–100 employees, support core Payroll/HR operations, and assist the accounting team. This is a hands-on role for someone who values accuracy, confidentiality, and follow-through.

What You'll Do

Payroll & HR (~60%)

• Process multi-state payroll and time reporting for exempt and non-exempt employees, ensuring compliance with company policy and wage and hour laws.
• Process payroll and personnel transactions, including hires, terminations, pay changes, bonuses, garnishments, and benefit adjustments.
• Serve as primary liaison with TriNet (PEO): maintain system setup, resolve discrepancies, and build custom reports.
• Prepare HRIS reports for internal and government reporting; support 401(k) reconciliations and annual audits.
• Coordinate recruiting and onboarding/offboarding, including the applicant tracking system, I-9s, and background checks.
• Support performance reviews, benefits analysis, HR training, and other HR projects; provide backup to administrative staff.

Accounting (~40%)

• Support accounts payable, including employee expense reports and weekly check/ACH payment runs.
• Prepare wire requests and assist with processing wires.
• Assist with corporate accounting, including cost allocations.

What You Bring

• Bachelor's degree in a related field, or equivalent experience.
• 2–5 years of payroll processing and time reporting experience; HR or recruiting coordination experience a plus.
• Working knowledge of federal and state wage and hour laws; multi-state payroll experience preferred.
• Strong attention to detail and math aptitude for payroll calculations and reconciliations.
• Excellent organization; able to manage competing deadlines and work independently with minimal supervision.
• Clear written and verbal communication and a service-oriented approach with employees at all levels.
• High degree of discretion with confidential information.
• Proficiency in Microsoft Office, especially Excel; comfortable learning new systems.

Office-based role; primarily seated computer work with occasional lifting up to 10 lbs. Extended hours may be required during peak periods. This position has no supervisory responsibilities.

SteelWave is an equal opportunity employer. Reasonable accommodations are available to enable individuals with disabilities to perform the essential functions of the role.