In-Office Administrative Assistant — Payroll & Invoicing Pro

MISTRAS Group, Inc.; Houma (LA); On-site; USD 35,000 - 42,000; Full time

Benefits offered by this job

Health benefits

Paid time off

Company paid training

Per diem for travel jobs

401K with company match

Job summary

MISTRAS Group in Houma, LA is seeking an Administrative Assistant to support day-to-day operations of the lab. The role focuses on document handling, scheduling, invoicing, and general admin duties, with in-office, Monday–Friday work.

Ideal candidates have at least 3 years of Administrative Assistant experience, strong MS Office skills, and the ability to manage multiple tasks with confidentiality and professionalism in a fast-paced environment. Experience with payroll and invoicing is a plus.

Qualifications

• 3+ years of administrative experience.
• Knowledge of payroll, expenses, POs, payables, month-end reports.
• Professional, organized, and able to take initiative.
• Strong communication and time management.
• Proficiency with Microsoft Office.
• IFS & Dayforce experience preferred.

Responsibilities

• Enter timesheets into payroll system and handle accounts payable and client invoicing.
• Provide administrative support to multiple managers.
• Support client communications via email and phone.
• Prepare documents in Word/PowerPoint/Excel/PDF as required.
• Maintain and update client files and assist in record retrieval.
• Scan, email, and file documents; ensure confidentiality.

Skills

Administrative exp

Payroll

Communication

MS Office

Time management

Education

High School Diploma

Tools

Microsoft Office

Job description

MISTRAS Group in Houma, LA is seeking an Administrative Assistant to support day-to-day operations of the lab. The role focuses on document handling, scheduling, invoicing, and general admin duties, with in-office, Monday–Friday work.

Ideal candidates have at least 3 years of Administrative Assistant experience, strong MS Office skills, and the ability to manage multiple tasks with confidentiality and professionalism in a fast-paced environment. Experience with payroll and invoicing is a plus.