Accounting & Administrative Assistant

Accounting & Administrative Assistant – Wauwatosa, WI

Trillium Staffing is now hiring an Accounting & Administrative Assistant in Wauwatosa WI! ($18–$22/hr)

We are seeking an Accounting & Administrative Assistant to support both accounting operations and general office functions. This position is contract-to-hire and offers the opportunity to grow with a fast-paced, organized, and collaborative team.

This role handles bookkeeping tasks, AP/AR support, payroll assistance, documentation management, and coordination across departments. The team is currently transitioning from Sage to Unanet ERP, so flexibility, curiosity, and strong follow-through are essential.

If you’re organized, proactive, and pride yourself on getting things done, this role is for you.

• Maintain daily bookkeeping tasks and ensure accurate financial records.
• Support accounts payable, accounts receivable, and payroll preparation.
• Track expenses, reconcile accounts, and update financial spreadsheets.
• Assist with project setup, billing documentation, and data entry.
• Provide administrative support to accounting, HR, and leadership teams.
• Manage document organization, reminders, filing, and general office needs.
• Follow up on open items and help ensure deadlines are met.
• Occasionally assist with packaging or inventory support as needed.

• Strong multitasking and organizational skills.
• Excellent communication — comfortable asking questions and following up.
• Proactive, dependable, and self‑directed.
• High attention to detail with accurate data‑entry skills.
• Comfortable working independently in a hybrid environment.
• Proficient in Excel and Smartsheet.
• 0–2 years of administrative or accounting experience preferred.
• Familiarity with Sage, Quick Books, or Unanet is a plus.

Apply today!

Trillium has been recruiting and placing professionals for over 30 years. From Fortune 100 companies to small businesses, our philosophy remains the same: to achieve excellence by providing quality employees and an uncompromising level of service. We believe in honesty, integrity, and a simple philosophy of providing value to our customers and our employees. We strive to be unsurpassed in the recruitment and placement of quality and skilled professionals.

Trillium is an Equal Opportunity Employer.