Office Administrative Assistant

Overview

As an Office Administrator, you are an invaluable asset who is critical to the success of the organization. The office runs like a well‑oiled machine because of your hard work and efforts. Technology is second nature to you—you are comfortable using computers and other office equipment to complete administrative and human resources related tasks. Maintaining a relationship with our employees and clients is a breeze because of your exceptional ability to communicate.

You are extremely dependable and put your best effort into all responsibilities. You get the big picture and want to contribute accordingly, and that is why you will have the opportunity for career growth within our company.

• Assist with processing payroll, accounts payable/receivable, and invoicing
• Support new hire processes, job changes, and terminations
• Complete and file HR forms (e.g., employment verifications, I‑9s)
• Assist with benefits processing and leave administration
• Enter vendor invoices and reconcile statements
• Support billing and collections efforts
  
  Help maintain office equipment and supply inventory
• Support general office administration and receptionist duties
• Attend meetings and participate in required trainings
• Other duties as assigned to support learning and office operations

• High school diploma or GED required.
• Associate degree or coursework in business, accounting, or human resources preferred.
• 1 year of ECS administrative experience. This role is designed for individuals looking to grow into an Office Administrator position and will include training across all key job functions.

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 #60 in Engineering News‑Record's Top 500 Design Firms (April 2026), #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:

ECS is an Equal Opportunity Employer.