Senior Site Administrator - Payroll & Invoicing Support

Monadelphous; Mackay Regional; On-site; AUD 90,000 - 130,000; Full time

Job summary

Monadelphous is seeking a Senior Site Administrator to join the Mackay Operations team on a permanent, full-time basis. The role is based from our Mackay office and will provide site-based support during shutdowns and outages as required, with local duties and roster flexibility.

The successful candidate will handle invoicing, procurement, cost tracking, payroll for 40+ staff, and admin support to the site manager.

Qualifications

• Experience in site administration and support
• Strong communication and problem-solving skills
• High attention to detail and customer service focus
• Ability to work with diverse teams and adapt to rosters

Responsibilities

• Weekly invoicing and client claims
• Procurement and purchase order management
• Cost tracking and variance analysis
• Credit card reconciliation
• Daily timesheet entry and weekly payroll for 40+ employees
• Admin support to site manager and project team
• Travel and medical bookings
• Assist with site compliance and onboarding

Skills

Invoicing

Procurement

Cost tracking

Payroll

Administration

Communication

Detail-oriented

Job description

Monadelphous is seeking a Senior Site Administrator to join the Mackay Operations team on a permanent, full-time basis. The role is based from our Mackay office and will provide site-based support during shutdowns and outages as required, with local duties and roster flexibility.

The successful candidate will handle invoicing, procurement, cost tracking, payroll for 40+ staff, and admin support to the site manager.