Principal Mechanical Engineer
Confirmed on the employer's own hiring board on Sep 25, 2026. First seen by Alion on Sep 25, 2026. AECOM scores B on the Alion truth index.
Work with Us. Change the World.
At AECOM, we're delivering a better world. Whether improving your commute, keeping the lights on, providing access to clean water, or transforming skylines, our work helps people and communities thrive. We are the world's trusted infrastructure consulting firm, partnering with clients to solve the worldâs most complex challenges and build legacies for future generations.
There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of over 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world.
We're one global team driven by our common purpose to deliver a better world. Join us.
Our Buildings & Places team based in Sydney are looking for a Principal Mechanical Engineer to support the continued growth of the business. This opportunity presents an excellent opportunity to develop your experience in delivering multi-disciplinary projects across the defence and data-centre space.
What will a day in this role look like:
- Utilise your extensive design experience to facilitate high-quality and cost-effective work on a variety of projects varying in size, scope and sector.
- Lead mechanical designs and delivery for our major client projects including participating in the technical review of projects whilst working collaboratively with the broader team.
- Assist in the mentoring and guidance of junior engineers within the local and national team including performing quality control review of design calculations and drawings.
- Work effectively within our multi-disciplinary engineering teams on major projects including contributing to interdisciplinary review of project deliverables.
Please note, due to the nature of the projects Australian Citizenship is required, with previous or current defence clearance highly regarded.
The following qualifications and experience are highly desired, but if you don’t tick all the boxes, you could still be a perfect fit for this role. Please apply, all applications will be considered.
What are we looking for from you?
- 8-10 year's experience working for a Building Services consultancy or have significant design experience working as a Senior Engineer in the Mechanical Services field.
- Proven knowledge and experience working within a technical design-focussed HVAC/Mechanical Engineering role.
- Demonstrable design experience across defence and data-centre projects.
- A track record in client management skills, project delivery and the ability to manage project priorities whilst communicating with internal and external stakeholders on key project deadlines and deliverables.
- Use your Tertiary Education (BEng in Mechanical Engineering or Building Services Engineering) alongside your understanding of Australian Building Services Projects and Standards to impart your technical knowledge to clients, junior engineers and broader teams on a range of major projects across Australia.
Why you’ll love working with us
- Flexible work arrangements, including alternative start/finish times, job-sharing and hybrid work options
- Purchase up to 6 weeks additional annual leave per year
- Flex public holidays - swap Easter or other holidays for ones that suit you better
- Continuous learning and growth - lunch and learns, professional development courses, financial study assistance, 5 days paid study leave, global career opportunities
Ready to push the limits of what’s possible?
We welcome applications from individuals of all backgrounds, including those with disabilities, additional health or mental health needs, and/or neurodiverse conditions. If you require any adjustments during the hiring process, please let us know.
Applications are reviewed as they come in, and the role may close earlier than expected, so if this opportunity sounds like you, we encourage you to apply as soon as possible.
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At AECOM, we are committed to maintaining a secure and trustworthy recruitment process and take any fraudulent hiring activity seriously. To support this commitment, all newly hired employees are required to attend an in-person Day 1 onboarding at an AECOM office location as a condition of employment.
AECOM acknowledges the Traditional Owners and Custodians of the lands on which we, our clients and our communities live and work around Australia. We pay our respects to their cultures and to their Elders - past, present, and emerging. We are committed to connecting to Country in our work through meaningful engagement with First Nations peoples and businesses. Find out more about our Australian Reconciliation Action Plan here: https://aecom.com/au/our-vision-for-reconciliation/.
At AECOM, we are committed to maintaining a secure and trustworthy recruitment process and take any fraudulent hiring activity seriously. To support this commitment, all newly hired employees are required to attend an in-person Day 1 onboarding at an AECOM office location as a condition of employment.
AECOM acknowledges the Traditional Owners and Custodians of the lands on which we, our clients and our communities live and work around Australia. We pay our respects to their cultures and to their Elders - past, present, and emerging. We are committed to connecting to Country in our work through meaningful engagement with First Nations peoples and businesses. Find out more about our Australian Reconciliation Action Plan here: https://aecom.com/au/our-vision-for-reconciliation/.
About AECOM
AECOM is the world’s trusted infrastructure consulting firm, delivering professional services throughout the project lifecycle - from advisory, planning, design and engineering to program and construction management. On projects spanning transportation, buildings, water, new energy and the environment, our public- and private-sector clients trust us to solve their most complex challenges. Our teams are driven by a common purpose to deliver a better world through our unrivaled technical and digital expertise, a culture of equity, diversity and inclusion, and a commitment to environmental, social and governance priorities. AECOM is a Fortune 500 firm and its Professional Services business had revenue of $16.1 billion in fiscal year 2025. See how we are delivering sustainable legacies for generations to come at aecom.com and @AECOM.
Freedom to Grow in a World of Opportunity
You will have the flexibility you need to do your best work with hybrid work options. Whether you’re working from an AECOM office, remote location or at a client site, you will be working in a dynamic environment where your integrity, entrepreneurial spirit and pioneering mindset are championed.
You will help us foster a culture of equity, diversity and inclusion - a safe and respectful workplace, where we invite everyone to bring their whole selves to work using their unique talents, backgrounds and expertise to create transformational outcomes for our clients.
AECOM provides a wide array of compensation and benefits programs to meet the diverse needs of our employees and their families. We also provide a robust global well-being program. We’re the world’s trusted global infrastructure firm, and we’re in this together - your growth and success are ours too.
Join us, and you’ll get all the benefits of being a part of a global, publicly traded firm - access to industry-leading technology and thinking and transformational work with big impact and work flexibility. As an Equal Opportunity Employer, we believe in each person’s potential, and we’ll help you reach yours.