Senior Contract Administrator

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About Us
McMahon Services is a privately owned, national leader in civil construction, demolition, environmental and infrastructure services. Our Civil & Infrastructure (C&I) stream is delivering major works across Australia – and we're growing.

We are now seeking an experienced Senior Contract Administrator to join our team in Adelaide. This is not your standard CA role – you won't be assigned to just one project. Instead, you'll have the opportunity to take commercial ownership across multiple concurrent projects, each at different stages of the lifecycle. You'll be a key part of our commercial team and pivotal to project success.

The Opportunity
Reporting to the Commercial & Finance Manager, this role is ideal for a high-performing, commercially driven professional who thrives in a fast-paced environment. You will manage and support the contract administration for a portfolio of civil and infrastructure projects.

This role requires a strong ability to prioritise competing demands, build strong working relationships with operational teams and subcontractors, and provide independent commercial oversight across multiple sites.

Key Responsibilities

Manage contract administration across a diverse portfolio of projects

Prepare and administer head contracts and subcontracts in collaboration with project teams

Oversee procurement processes, including scopes of work and contract execution

Lead the administration of variations, claims, delays, extensions of time and progress payments

Drive accountability in monthly reports, support forecasting and track project financial performance

Ensure contractual compliance and proactively manage commercial risk

Work closely with Project Managers to drive commercial outcomes

Act as a mentor and technical lead for the Contract Administrators

About You

Tertiary qualification in Construction Management, Law, Engineering or similar

Minimum 8 years' experience in a contracts or commercial role within civil or infrastructure sectors

Demonstrate technical and persuasive writing skills, with the ability to draft and review contract documentation, variation claims and commercial correspondence clearly and effectively

Proven experience managing multiple projects concurrently

Strong knowledge of Australian Standard and bespoke contract

Excellent communication and interpersonal skills

High level of organisation, initiative and attention to detail

Strong ability to build rapport and influence outcomes across multiple stakeholder groups

What We Offer

A dynamic role with variety – no two days or projects are the same

Exposure to diverse and high-value projects across the civil & infrastructure sector

Supportive team culture and experienced leadership

Competitive remuneration and long-term development opportunities

A chance to make a real impact within a growing national business

Apply Now
If you're a confident commercial professional ready to step into a role with variety, responsibility and autonomy, we want to hear from you.

Apply via SEEK with your CV and a brief cover letter.

Learn more about us at

Salary match Number of applicants Skills match

Your application will include the following questions:Which of the following statements best describes your right to work in Australia? How many years' experience do you have as a contracts administrator? Which of the following types of infrastructure project do you have experience with? How many years' experience do you have in the construction industry? What's your expected annual base salary? How much notice are you required to give your current employer? Do you hold a Construction Induction Safety certificate (White Card)?

McMahon Services is an industry leading, privately owned industrial, construction and environmental services provider.

Established in 1990 by brothers David and Andrew McMahon, McMahon Services has grown from a team of 12 into a truly national business.

Our family business heritage and culture of innovation set us apart, fostering a commitment to developing leading edge approaches across the whole organisation that surpass industry standards.

With offices in South Australia, Queensland, Western Australia, New South Wales, Victoria and the Northern Territory, we employ more than 500 staff and deliver projects from city centres to remote locations

McMahon Services has delivered some of Australia's most difficult and significant construction services projects.

We go to where our clients need us to be, with a proven ability to undertake work in remote locations, coupled with an exceptional emergency response capability. Our immediate response means we are on-site ready to plan and take action when needed.

Our diversity and can-do attitude are our core strengths. We apply our knowledge, resources and experienced teams to work across a broad range of disciplines and sectors, providing our clients with the expertise and hands-on skills to meet their specific needs.As a multi-disciplinary, full service provider, we use our own direct wage staff and boast a $70 million network of modern company-owned plant and equipment.

We were awarded Federal Safety Accreditation in 2009 – the first multi-disciplinary construction services company in Australia to achieve this recognition.

We look forward to the future and tackling new challenges with the same enthusiasm, dedication and excellence that has been true of all of our operations to date.

Our core values stem from our beginnings as a small family business and remain unchanged.

Our people are central to what we do

Our greatest asset is our people. It is through the hard work of our teams across the business that McMahon Services has continued to grow and extend the boundaries of performance. Our business is rich in tradition, with many of our staff being second generation employees.

We strive for innovation

Innovation and surpassing industry standards is what we strive for. We approach each project with safe, cost effective and value adding solutions. McMahon Services has been recognised by the industry and our peers for innovation and best practice, and we will continue to reach for new heights.

We have an unbeatable can-do attitude

We are determined to exceed client expectation with every project we undertake, no matter the size. We go the distance and to where our clients need us to be. We have built our business on tackling the tough jobs.

We are safety focused and our business is underpinned by a strong safety culture – team mates looking after team mates. Our objective is to continually improve our safety performance to ensure a zero harm environment for our works, stakeholders and the wider community.

We have a family business heritage

We respect where we have come from and all those involved in the ongoing journey from clients to partners, subcontractors, suppliers and staff.

Source: this is an extract from the company's own website.

McMahon Services is an industry leading, privately owned industrial, construction and environmental services provider.

Established in 1990 by brothers David and Andrew McMahon, McMahon Services has grown from a team of 12 into a truly national business.

Our family business heritage and culture of innovation set us apart, fostering a commitment to developing leading edge approaches across the whole organisation that surpass industry standards.

With offices in South Australia, Queensland, Western Australia, New South Wales, Victoria and the Northern Territory, we employ more than 500 staff and deliver projects from city centres to remote locations

McMahon Services has delivered some of Australia's most difficult and significant construction services projects.

We go to where our clients need us to be, with a proven ability to undertake work in remote locations, coupled with an exceptional emergency response capability. Our immediate response means we are on-site ready to plan and take action when needed.

Our diversity and can-do attitude are our core strengths. We apply our knowledge, resources and experienced teams to work across a broad range of disciplines and sectors, providing our clients with the expertise and hands-on skills to meet their specific needs.As a multi-disciplinary, full service provider, we use our own direct wage staff and boast a $70 million network of modern company-owned plant and equipment.

We were awarded Federal Safety Accreditation in 2009 – the first multi-disciplinary construction services company in Australia to achieve this recognition.

We look forward to the future and tackling new challenges with the same enthusiasm, dedication and excellence that has been true of all of our operations to date.

Our core values stem from our beginnings as a small family business and remain unchanged.

Our people are central to what we do

Our greatest asset is our people. It is through the hard work of our teams across the business that McMahon Services has continued to grow and extend the boundaries of performance. Our business is rich in tradition, with many of our staff being second generation employees.

We strive for innovation

Innovation and surpassing industry standards is what we strive for. We approach each project with safe, cost effective and value adding solutions. McMahon Services has been recognised by the industry and our peers for innovation and best practice, and we will continue to reach for new heights.

We have an unbeatable can-do attitude

We are determined to exceed client expectation with every project we undertake, no matter the size. We go the distance and to where our clients need us to be. We have built our business on tackling the tough jobs.

We are safety focused and our business is underpinned by a strong safety culture – team mates looking after team mates. Our objective is to continually improve our safety performance to ensure a zero harm environment for our works, stakeholders and the wider community.

We have a family business heritage

We respect where we have come from and all those involved in the ongoing journey from clients to partners, subcontractors, suppliers and staff.

Source: this is an extract from the company's own website.

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What can I earn as a Contracts Administrator