Site Administrator: Payroll, Invoicing & Mon-Fri Ops

Monadelphous; Mount Thorley; On-site; AUD 65,000 - 85,000; Full time

Benefits offered by this job

Permanent full-time

Mon–Fri roster

Safety and wellbeing focus

Career development opportunities

Job summary

Monadelphous is seeking an experienced Site Administrator to join our NSW Operations team on a permanent full-time basis. Based on site in the Upper Hunter, the role covers daily timesheets, payroll, invoicing and PO management for 40+ staff, with a Monday–Friday roster and local operations.

The successful candidate will be highly organised, detail‑oriented and able to work independently to meet deadlines, maintain accurate records and support day-to-day site operations.

Qualifications

• Experience with timesheets, payroll administration, invoicing and purchase orders.
• Strong attention to detail and accuracy.
• Excellent organisational skills with the ability to prioritise deadlines.
• Proficiency in Microsoft Office, particularly Excel.

Responsibilities

• Prepare, entry and manage daily timesheets and payroll for 40+ employees.
• Prepare and submit client claims and invoicing; raise and track purchase orders.
• Monitor project costs and variances; manage records.
• Maintain accurate records and complete administrative tasks on time.
• Liaise with supervisors, managers and clients to ensure timely information.
• Provide high-quality administrative support to the site operations team.

Skills

Timesheets

Payroll

Invoicing

Purchase orders

Excel

Organisation

Communication

Independence

Tools

Microsoft Office

Job description

Monadelphous is seeking an experienced Site Administrator to join our NSW Operations team on a permanent full-time basis. Based on site in the Upper Hunter, the role covers daily timesheets, payroll, invoicing and PO management for 40+ staff, with a Monday–Friday roster and local operations.

The successful candidate will be highly organised, detail‑oriented and able to work independently to meet deadlines, maintain accurate records and support day-to-day site operations.