Senior Administrative Assistant

Position Overview

The Senior Administrative Assistant provides high-level administrative and operational support to leadership, with a strong focus on expense management, payroll coordination, and travel logistics. This role requires exceptional organization, attention to detail, and the ability to manage multiple priorities in a fast-paced environment while maintaining confidentiality and professionalism.

Key Responsibilities

Expense Management

• Prepare, review, and reconcile employee expense reports for accuracy and policy compliance

• Track corporate expenses and assist with budgeting and reporting

• Partner with finance to resolve discrepancies and ensure timely processing

Payroll Support

• Assist with payroll preparation, including collecting and verifying timesheets and employee data

• Coordinate with HR and payroll vendors to ensure timely and accurate payroll processing

• Maintain and update employee records related to compensation and deductions

Travel Coordination

• Arrange domestic and international travel, including flights, accommodations, transportation, and itineraries

• Manage calendar scheduling around travel and business priorities

• Handle travel-related changes, cancellations, and expense tracking

Administrative & Operational Support

• Provide day-to-day administrative support to leadership and/or departments

• Manage calendars, meetings, and communications

• Maintain organized filing systems and ensure document accuracy

• Support cross-functional coordination across departments

• Handle confidential information with discretion

Qualifications

• 3+ years of administrative experience, preferably in a Senior or executive support role

• Experience supporting expense reporting, payroll processes, and travel coordination

• Strong proficiency in Microsoft Office (Excel, Outlook, Word) and expense/HRIS systems

• Excellent organizational, multitasking, and time management skills

• Strong attention to detail and problem-solving abilities

• Effective communication and interpersonal skills

• Ability to work independently and handle sensitive information with discretion

Job Type & Location

This is a Contract to Hire position based out of New Berlin, WI.

Pay and Benefits

The pay range for this position is $27.00 - $30.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: Medical, dental & vision Critical Illness, Accident, and Hospital 401(k) Retirement Plan Pre-tax and Roth post-tax contributions available Life Insurance (Voluntary Life & AD&D for the employee and dependents) Short and long-term disability Health Spending Account (HSA) Transportation benefits Employee Assistance Program Time Off/Leave (PTO, Vacation or Sick Leave)

Workplace Type

This is a fully onsite position in New Berlin,WI.

Application Deadline

This position is anticipated to close on Jun 16, 2026.

About Aston Carter

Aston Carter provides world-class corporate talent solutions to thousands of clients across the globe. Specialized in accounting, finance, human resources, talent acquisition, procurement, supply chain and select administrative professions, we extend the capabilities of industry-leading companies. We draw on our deep recruiting expertise and expansive network to meet the evolving needs of our clients and talent community with agility and excellence. With offices across the U.S., Canada, Asia Pacific and Europe, Aston Carter serves many of the Fortune 500. We are proud to be a ClearlyRated Best of Staffing double diamond winner for both client and talent service.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

If you would like to request a reasonable accommodation, such as the modification or adjustment of the job application process or interviewing process due to a disability, please email ... (%...) for other accommodation options.

San Francisco Fair Chance Ordinance: Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI): We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.