Accounts Payable Officer

Firmus Technologies
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.
At Firmus, we are unique in our approach. We design, build, and operate a new class of digital infrastructure – the AI Factory. Through our model-to-grid technology approach, we have pushed the boundaries of multi-generational liquid cooling systems, energy management, AI software orchestration, and construction. For our customers, this approach allows us to make every watt count and deliver low-cost AI tokens globally.
Firmus AI Cloud
Our large-scale GPU cloud platform, Firmus AI Cloud, is purpose-built to deliver energy-efficient AI compute at scale to customers.
It empowers developers, enterprises, educational institutions, and government users to train and deploy AI models with unmatched efficiency and cost savings. With an ever-growing suite of services and applications, we are committed to delivering a cloud experience that is market-leading, proprietary, and built to scale.
Why Firmus?
As an NVIDIA Cloud and Engineering partner in Asia Pacific, you will gain skills, experience, and exposure across the AI industry and be part of shaping what this industry looks like for decades to come.
We are founder-led, not a big corporate. Decisions happen fast, our leaders are accessible, and there's minimum bureaucracy between you and the work. Ownership comes early. Whatever your role, you will have a direct line to outcomes, helping shape how the business grows as we scale nationally across a long-term, large-scale roadmap.
Work alongside founders and experts in AI infrastructure, energy systems and next-generation compute.
What we build here has impact beyond the business. Our AI Factories are designed to operate as assets to the energy grid to actively strengthen the communities and regions they operate in rather than drawing from them.
Considering applying? You don't need a perfect background to join our team. If you're driven and curious, there's a path for you. We back our people to grow into new domains and take on challenges beyond their previous experience.
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.
You will work closely with suppliers, Procurement, project teams and Finance to resolve issues.
You will maintain clean AP records and support efficient month-end close.
You will bring strong attention to detail, sound judgement and a continuous improvement mindset to help strengthen controls and simplify day-to-day AP processes
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
Strong communication skills
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.
Join us in our mission to revolutionise the AI industry through sustainable practices and cutting-edge engineering. Apply now to be part of shaping the future of sustainable AI infrastructure.