Administrative Specialist - San Marcos, CA

Your Impact At Jacobs, we’re challenging today to reinvent tomorrow by solving the world’s most critical infrastructure and environmental challenges. As an Industrial Pretreatment Coordinator, you’ll play a key role in protecting public health and the environment by ensuring industrial wastewater meets regulatory standards before entering treatment systems. Your work directly supports sustainable water management and helps communities thrive. Administrative Specialist Jacobs is searching for a dynamic Administrative Specialist to join our team at the Twin Oaks Valley Water Treatment Plant in San Marcos, CA . In this role, you'll interface with the plant operations team, corporate accounting, supply chain and procurement to ensure timely submission and accuracy of invoices. You’ll require attention to detail, effective communication in written and verbal form, problem‑solving skills, and close collaboration with internal teams and vendors to meet client expectations. In addition, you may work on special projects to implement corporate standards at the facility. As an Administrative Specialist, you’ll join a collaborative team ensuring that all contractual and regulatory standards are upheld while producing safe, clean drinking water. The facility we operate is a 100‑mgd potable water treatment plant using combined submerged membrane filtration, ozone disinfection, advanced oxidation, and biological activated carbon to meet strict water quality standards for the San Diego metropolitan area. At its completion in April 2008, it was, and continues to be, one of the largest water treatment plants using membrane filtration in the world. Essential Duties and Responsibilities Work closely with Project Manager to support project administrative tasks Reconcile expenses for Project Manager and/or staff Manage, maintain records, and approve all invoices Assist vendors in getting vetted through Ariba, the Jacobs procurement system Follow up on vendors’ invoices, reports, and documentation of work performed Handle all procurement tasks & purchase requisitions Handle all invoice/payment status requests Maintain records of Hazardous Waste manifests and various permits Manage operator certification records and send reminders for certification/license renewals and/or training Assist with staff registrations for conferences and renewals of professional memberships Manage contractor certification renewals Manage project org chart(s) and distribution lists Fleet vehicle registration and insurance renewals Facility incentive program tracking Prepare and manage job requisitions Assist with new hires and onboarding Be the source for general administrative questions Compile and submit monthly managed contractor hours Collect, sort, and distribute mail Keeps break room stocked with supplies Performs other duties as required Here’s what you’ll need One (1) to two (2) years of experience in the areas of purchasing, billing, and accounts payable Experience working in an office setting Knowledge of procurement practices, finance, accounts payable and billing procedures Knowledge and ability to analyze data and maintain physical and electronic records management Proficient in MS Office Knowledge and ability to write standard operating procedures (SOP) for various administrative and procurement processes Ability to produce clear and precise administrative reports Experience in electronic records management software Work independently and in a team environment Valid CA Driver’s license with no major infractions Ideally, You’ll Also Have AA Degree in Business, Office Management, or a related field of study preferred Two (2) years’ experience in Accounts Payable desired One (1) year of experience with Accounts Payable software strongly preferred Experience using the following applications My Payables, Concur, Ariba, SharePoint Working Conditions Safety is a core value at Jacobs. We are committed to providing a safe and healthy workplace for all employees. This position will spend a substantial amount of time performing safety sensitive labor or services. Our health and welfare benefits are designed to invest in you, and in the things you care about. Your health. Your well‑being. Your security. Your future. Employees have access to medical, dental, vision and basic life insurance, 401(k) plan, paid time off (allocated plans start date 17 days per calendar year), seven paid holidays, caregiver leave and the ability to purchase company stock at a discount as well as legally mandated benefits. The base salary range for this position is $58,240.00 to $74,880.00; though will be paid hourly based on hours worked. Within the range, individual pay is determined by work location and additional factors, including job‑related skills, experience, and relevant education or training. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or protected veteran status. Job posted on June 26, 2026. This position will be open for at least 3 days. Onsite employees are expected to attend a Jacobs Workplace on a full‑time basis, as required by the nature of their role. Your application experience is important to us, and we’re keen to adapt to make every interaction even better. If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact the team via Careers Support. #J-18808-Ljbffr Jacobs