Office Administrative Manager

ECS Ltd•Walnut Creek, CA

14d•$30 - $37

About The Position

ECS Group of Companies (ECS) was founded in 1988 with the goal to raise the standards of professional engineering consulting. Today, we are a leader in geotechnical, construction materials, environmental and facilities consulting services. We are employee-owned with more than 3,000 employees in 100+ offices and testing facilities coast to coast. ECS is currently ranked #66 in Engineering News-Record’s Top 500 Design Firms (April 2025), #148 in Engineering News-Record’s Top 200 Environmental Firms (October 2025) and #50 in Zweig Group’s Hot Firm List (May 2025). For additional information about ECS, visit: www.ecslimited.com. ECS is an Equal Opportunity Employer. To learn more, click here.

Requirements

High school diploma or GED and relevant certification (SHRM-CP or PHR) required. Bachelor’s degree (HR related) preferred.
Minimum 4 years of HR and payroll experience with an HR degree
6 years of HR and payroll experience without an HR degree.
If driving for, or on behalf of, any ECS subsidiary, a valid driver’s license is required.

Nice To Haves

Bachelor’s degree (HR related) preferred.

Responsibilities

Manage all administrative functions of the office include maintaining accounting, human resources, payroll and other duties as assigned.
Manage HR and Accounting at the office level.
Process payroll, accounts payable, accounts receivable.
Process new hire, termination, and employment verification paperwork.
Track immigration status.
Process benefits (including new enrollments, open enrollment and update as required).
Assist with warning reports and disciplinary actions.
Assist employees with processing leave of absence and short-term disability claims.
Assist with other HR issues as needed.
Enter vendor invoices into the accounting system accurately and timely.
Reconcile vendor statements and resolve discrepancies.
Generate and send invoices to customers in accordance with contract terms.
Monitor outstanding invoices and ensure accurate records are maintained.
Follow up on past-due accounts via phone and email.
Work with customers to resolve billing issues.
Maintain accurate records of collection efforts and provide reports on aging receivables.
Oversee building and equipment maintenance.
Maintain and update certificates of insurance.
Responsible for ordering and support for computers, phones, and other devices.
Support administrative management of the office.
Track and update professional licenses.
Support Management Group with special projects, reports, meetings, and training.
Attend and participate with monthly management group meetings.
Other duties as assigned.