McMahon Services is looking for a motivated and commercially minded Contracts Administrator to join our Civil & Infrastructure team in Adelaide.

This is a great opportunity for someone with at least two years' experience in construction contract administration who enjoys working closely with project teams, managing contractual requirements and finding practical solutions.

You'll be involved in contract reviews, subcontractor agreements, commercial reporting, contractual notices and claims, supporting the successful delivery of civil and infrastructure projects.

We're particularly interested in candidates who have experience with collaborative head contract procurement models, including ITC, and are confident preparing contractual correspondence and notices.

About McMahon Services

McMahon Services is one of Australia's largest privately owned construction, industrial and environmental services organisations, employing more than 1,300 people across Australia.

Our Civil & Infrastructure team delivers a diverse range of projects, including civil construction, roads, bridges, earthworks and infrastructure works.

With strong self-performing capabilities across our business, we take pride in the projects we deliver and the people behind them.

We offer a supportive environment where employees can develop their skills, take on new challenges and build long-term careers.

About the Role

Reporting to the T2D Commercial Manager, you'll support the effective administration of contracts and commercial processes across our Civil & Infrastructure projects.

Working closely with internal Construction Managers, Project Managers, Finance Managers, Legal and the customer, you'll help manage head contracts, subcontractor agreements, contractual notices, claims and commercial reporting.

The role will also involve preparing upstream and downstream contractual correspondence, supporting collaborative procurement arrangements and assisting with the management of commercial risks throughout project delivery.

What You'll Do

- Interpret executed contracts to verify risk allocation, entitlement and obligations.
- Monitor compliance with contractual obligations, processes and approval requirements.
- Lead commercial progress coordination meetings (internal/customer)
- Track and monitor commercial KPI’s and develop reports
- Administration of collaborative head contract procurement models, including ITC arrangements.
- Draft and manage general contractual notices, both upstream to clients and downstream to subcontractors.
- Prepare cost build-ups and supporting evidence for variations, drawing on site diaries, labour and plant records, subcontractor costs and measured quantities.
- Manage extensions of time (EOTs), variations,



delay costs and latent condition claims.
- Maintain change and claims registers, tracking contractual deadlines, submission status, outstanding assessments and agreed close-out actions.
- Assist with monthly project reporting and commercial meetings.
- Reconcile general ledger costs, payment claims and client assessments at transaction and package level
- Prepare contract summaries and maintain accurate commercial documentation.
- Maintain change and claims registers, tracking contractual deadlines, submission status, outstanding assessments and agreed close-out actions.
- Work closely with Project Managers and Legal teams to identify and manage contractual risks.
- Support monthly project reporting and commercial review meetings.
- Reconcile general ledger costs, payment claims and client assessments at transaction and package level
- Assist with commercial risk management, disputes and claims as required.
- Maintain strong working relationships with clients, subcontractors, suppliers and internal stakeholders.

What You'll Bring

- Experience working with collaborative head contract procurement models, particularly ITC.
- Minimum 5-years working within the construction sector, and 3-years' experience in a Contracts Administrator role.
- Degree qualification in Engineering, Construction Management, Business, Law or a related discipline.
- Sound understanding and exposure to various procurement and delivery models, construction contract forms, commercial processes and project administration.
- Ability to interpret utility and civil construction drawings and quantify changes in scope to support remeasurement and cost assessment.
- Experience drafting general contractual notices and correspondence for both upstream and downstream stakeholders.
- Experience reviewing contracts, managing subcontractor agreements and preparing contractual documentation.
- Strong commercial awareness and attention to detail.
- Excellent written and verbal communication and negotiation skills.
- Ability to manage competing deadlines and work collaboratively with project teams.
- Strong problem-solving and organisational skills.
- Proficiency in Microsoft Office, including MS Project.
- Experience using Pronto or a similar ERP system.
- Practical experience with cost-based progress claims and reconciliation of labour, plant, materials and subcontractor costs.




- Current Driver's Licence.
- A proactive attitude and commitment to safety and continuous improvement.

What Will Set You Apart

- Previous experience working on major or mega infrastructure projects.
- Experience working with construction contractors that primarily self-perform their project delivery.
- Experience preparing upstream contractual notices and progress claims.
- Strong background in civil construction and infrastructure projects.
- Exposure to head contract reviews, collaborative procurement arrangements and subcontract negotiations.
- Exposure to Adjustment Event administration, target outturn cost (TOC) adjustments or cost-reimbursable contract arrangements.
- Experience preparing EOTs, variations, delay claims and other contractual submissions.
- Robust understanding of project commercial reporting and risk management.
- Experience with Aconex, Power BI, SharePoint, Dashpivot or equivalent document control, commercial reporting and site record systems.

- Advanced Excel skills, including XLOOKUP, SUMIFS, PivotTables and reconciliation of large transaction-level cost and claims datasets.

- Experience working closely with Commercial Managers, Project Managers and Legal teams.
- Confidence identifying commercial risks and developing practical solutions.

Why Join McMahon Services?

- Work across diverse civil construction and infrastructure projects.
- Join a supportive and experienced Civil & Infrastructure team.
- Gain exposure to a broad range of commercial and contractual activities.
- Develop your contract management, negotiation and commercial skills.
- Work closely with experienced Project Managers and commercial professionals.
- Genuine long-term career development opportunities.
- Access ongoing learning and development through the MAC Learning Academy.
- Be part of an established Australian-owned business where your contribution is valued.

Ready to Take the Next Step?

If you're an experienced Contracts Administrator looking to broaden your experience and continue developing your commercial career within civil construction and infrastructure, we'd love to hear from you.

Apply today and build your career with McMahon Services.

No recruitment agencies please.

At McMahon Services, we embrace diversity and inclusion as fundamental values. We believe that a diverse workforce fosters innovation, creativity and a deeper understanding of the communities we serve. We are committed to creating an inclusive environment where all employees feel valued, respected and empowered to contribute their unique perspectives and talents. We encourage applications from people of all backgrounds, identities and experiences.

📌 Senior Contract Administrator (Dry Creek)
🏢 Mcmahon Services
📍 Dry Creek