Accounts Payable Officer in Sydney

Firmus Technologies is a global leader pioneering the development and operation of efficient AI infrastructure across Asia Pacific. Founded in Australia in 2019, our mission is to create the most efficient AI infrastructure by combining cutting-edge technology with a steadfast commitment to sustainability.

Role Summary

The AP Officer will support the accurate, timely and well-controlled processing of supplier invoices and payments as Firmus scales its AI infrastructure and construction activities across multiple entities and projects. Reporting to the Finance Systems & Automation Lead, this is a hands-on role responsible for high-volume Accounts Payable processing, with a strong focus on purchase order compliance, coding accuracy, invoice matching and the correct allocation of costs across projects, assets and cost centres.

Key Responsibilities:

• End-to-end Accounts Payable processing in a high-volume environment
• Processing large volumes of supplier invoices across multiple entities and projects
• Reviewing and validating purchase orders, approvals, coding, and invoice matching to ensure accuracy
• Processing high-value capital expenditure (CapEx) and asset-related invoices for construction projects
• Ensuring accurate allocation of costs across projects, assets, and cost centres
• Managing supplier prepayments and ensuring correct allocation against invoices
• Handling multi-currency invoices and payments
• Reviewing and processing employee expense claims to ensure accuracy and compliance
• Investigating invoice discrepancies and resolving AP issues with suppliers, procurement, and project teams
• Working within complex approval workflows and ensuring coding accuracy
• Assisting with month-end AP close activities, accruals, and reconciliation support
• Ensuring compliance with internal controls, company policies, and audit requirements

What Success Looks Like:

• Invoices and expenses are processed accurately and within agreed timelines, with minimal backlog.
• Purchase order matching, coding and cost allocations are consistently accurate across entities, projects, assets and cost centres.
• CapEx and asset-related expenditure is processed correctly, supporting reliable project and financial reporting.
• Supplier and stakeholder queries are resolved promptly, with minimal aged exceptions and rework.
• Month-end AP activities, reconciliations and accrual support are completed accurately and on schedule.
• AP processes remain audit-ready, with opportunities to improve efficiency, controls and automation proactively identified.

Skills & Experience

Required Skills

• Strong attention to detail and ability to manage competing deadlines in a fast-paced environment
• Ability to work collaboratively with procurement, project managers, and finance stakeholders
• Problem solving skills, and a continuous improvement mindset

Preferred Experience

• Proven experience in high-volume invoice processing environments
• Experience processing CapEx or asset-related invoices
• Experience supporting construction, infrastructure, engineering, or data centre projects highly regarded
• Multi-entity and multi-currency environment experience
• Intercompany transaction experience
• Strong understanding of purchase orders, invoice matching, and approval workflows
• Understanding of how AP transactions impact the General Ledger
• Understanding of posting periods, accruals, and month-end controls

Location & Reporting

Location: Sydney, Australia
Reporting to: Finance Systems and Automation Lead
Employment Basis: Permanent full-time

Diversity

At Firmus, we are committed to building a diverse and inclusive workplace. We encourage applications from candidates of all backgrounds who are passionate about creating a more sustainable future through innovative engineering solutions.