Description We are offering a long term contract employment opportunity for a Payroll Specialist in Ontario, California. As a Payroll Specialist, you will play a key role in managing payroll functions, including processing and auditing, for a team of approximately 100 employees and 30 union employees. Your tasks will involve handling payroll through ADP, ensuring compliance with payroll laws, and working closely with Workers Compensation. Responsibilities: • Accurately process weekly payroll for union workers • Oversee in-house calculations of union dues • Ensure compliance with prevailing wage and payroll laws • Manage payroll taxes using ADP tools • Work with Workers Compensation on a quarterly and annual basis • Handle accounting functions related to payroll • Utilize accounting software systems to maintain accurate payroll records • Audit payroll records regularly to ensure accuracy • Manage benefit functions related to payroll • Handle 401k - RRSP Administration tasks related to payroll. Requirements • Proficiency in Accounting Software Systems • Experience with ADP - Financial Services • Familiarity with ADP Workforce Now • Proficiency in using Ceridian • Knowledge of Dayforce software • Prior experience in 401k - RRSP Administration • Familiarity with About Time software • Ability to handle Accounting Functions • Experience in Auditing • Understanding of Benefit Functions • Knowledge of Construction sector • Familiarity with Prevailing Wage calculations • Experience in Certified Payroll • Experience with Payroll - Union Robert Half is the world’s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles. Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app (https://www.roberthalf.com/us/en/mobile-app) and get 1-tap apply, notifications of AI-matched jobs, and much more. All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit roberthalf.gobenefits.net for more information. © 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking “Apply Now,” you’re agreeing to Robert Half’s Terms of Use (https://www.roberthalf.com/us/en/terms) .