Job Title: AP/AR Billing Clerk III Location: San Antonio, TX Employment Type: Long-term Contract throughout December 2025 Work Schedule: Monday to Friday, 8:00 AM to 5:00 PM Job Description: System One is currently seeking two AP/AR Billing Clerk s III to join our team in San Antonio, TX. This role requires proficiency in transactional business processes, with a strong focus on Accounts Payable. The selected candidate will perform a variety of routine accounting functions under general supervision and in accordance with standard procedures. You will work collaboratively with technical and managerial staff, other departments, and contractors to resolve invoice and payment issues efficiently. Responsibilities: + Receive and process vendor invoices, including performing 3-way match and/or obtaining proper approvals and support documentation. + Ensure accuracy of invoice billing and resolve discrepancies. + Research source documents and prepare simple accounting reports. + Respond to assigned queries accurately and in a timely manner. + Build and maintain positive working relationships with internal departments, project managers, and external vendors. + Perform general office tasks such as operating office equipment, processing mail, and managing confidential materials. + Sort and classify documentation according to record retention policies. + Collaborate with IT to address system issues, support enhancements, and validate data. + Support special projects and tasks as assigned by the manager. Job Requirements: + High school diploma or equivalent + Proficiency in Microsoft Office, especially Excel + Strong written and verbal communication skills + Familiarity with general office equipment and software + Ability to meet deadlines and manage priorities Preferred Qualifications: + 1–2 years of Accounts Payable experience + Advanced Excel skills + Ability to thrive in a fast-paced, deadline-driven environmen + Prior experience in the construction industry #M1 Ref: #236-Eng Pasadena System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible full-time employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan. System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.