Demo

Office Administrator

ECS Group of Companies
Brookfield, WI Full Time
POSTED ON 4/25/2026
AVAILABLE BEFORE 10/21/2026
Resposibilities

  • Perform accounting, human resources and other administrative duties with supervision.
  • Process payroll, accounts payable, accounts receivable and invoicing.
  • Track and document the petty cash/corporate credit card accounts by writing checks, requesting replenishments, reconciling bank and internal accounting balances.
  • Process new hire, job changes, pay rate changes, and terminations
  • Complete various human resource related forms, such as employment verification paperwork.
  • Track immigration status and updating I-9s as required.
  • Process benefits (including new enrollments, open enrollment and update as required).
  • Assist with warning reports.
  • Process leave of absence and short-term disability claims.
  • Assist with other HR issues as needed.
  • Maintain and update certificates of insurance.
  • 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.
  • Responsible for computer network support.
  • Support receptionists and administrative management of the office.
  • Other duties as assigned.

Qualifications

  • High school diploma or GED. Bachelor's degree (HR related) preferred.
  • Minimum 2 years of experience of HR and payroll experience with an HR degree
    • 4 years of HR and payroll experience without an HR degree.
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: www.ecslimited.com.

ECS is an Equal Opportunity Employer. To learn more, click here.

Salary.com Estimation for Office Administrator in Brookfield, WI
$49,293 to $61,396
If your compensation planning software is too rigid to deploy winning incentive strategies, it’s time to find an adaptable solution. Compensation Planning
Enhance your organization's compensation strategy with salary data sets that HR and team managers can use to pay your staff right. Surveys & Data Sets

What is the career path for a Office Administrator?

Sign up to receive alerts about other jobs on the Office Administrator career path by checking the boxes next to the positions that interest you.
Income Estimation: 
$49,359 - $62,131
Income Estimation: 
$59,158 - $74,794
Employees: Get a Salary Increase
View Core, Job Family, and Industry Job Skills and Competency Data for more than 15,000 Job Titles Skills Library

Job openings at ECS Group of Companies

  • ECS Group of Companies Louisville, KY
  • Observing and documenting field activities related to the construction process Sampling, testing, and inspecting soils, aggregates, concrete, grout, masonr... more
  • 1 Day Ago

  • ECS Group of Companies Memphis, TN
  • Observing and documenting field activities related to the construction process Sampling, testing, and inspecting soils, aggregates, concrete, grout, masonr... more
  • 1 Day Ago

  • ECS Group of Companies Monroeville, PA
  • No experience necessary, paid training is provided, and we pay your certification fees! ECS Limited is offering a unique opportunity for a talented Constru... more
  • 1 Day Ago

  • ECS Group of Companies Tampa, FL
  • The primary responsibility for this position is to assist with scheduling operations, including communicating with contractors and technicians on a daily b... more
  • 1 Day Ago


Not the job you're looking for? Here are some other Office Administrator jobs in the Brookfield, WI area that may be a better fit.

  • Helping Hands Personal Care LLC Waukesha, WI
  • Job Summary We are seeking a dynamic and highly organized Office Administrator to join our team! In this vital role, you will be the backbone of our daily ... more
  • 18 Days Ago

  • Aspen Homes, Inc. Milwaukee, WI
  • Office Administrator – Aspen Homes, Inc. Location: Pewaukee • Job Type: Full-Time Aspen Homes, Inc. is a well-established custom home builder known for qua... more
  • 20 Days Ago

AI Assistant is available now!

Feel free to start your new journey!