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Mott MacDonald • Sydney, AU

Principal Mechanical Engineer

Employment type:  Full time
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Job Description

Brilliant people trusted to do brilliant things

Mott MacDonald is a vibrant and forward-thinking engineering, management, and development consultancy. Working together as a global team we plan, design, deliver and maintain the transport, energy, water, buildings, and wider infrastructure that is integral to people’s daily lives. We value excellence in every dimension of our business and continuously seek opportunities to improve what we do and how we do it.

We employ brilliant people who combine their diverse skills and experiences to achieve brilliant things. Whether you want to specialise or broaden your experience, you'll be supported by global specialists eager to share their expertise. With numerous opportunities to learn and grow, the possibilities are as diverse as our people. Working as a connected global team, we deliver impactful projects that shape the future.

Your Opportunity

Due to exciting upcoming projects, we have an exciting opportunity for a Principal Mechanical Engineer to be part of our Buildings services team in Sydney. You will be joining a diverse team of people who are passionate about what they do, with a proven track record of guiding our projects and clients, and leading the delivery across large reputed infrastructure projects.

You will:

  • Leading mechanical design packages from concept through detailed design and construction support.

  • Making independent engineering decisions on complex technical issues and project challenges.

  • Reviewing and approving calculations, specifications, schedules, reports and design documentation.

  • Managing project deliverables to agreed programme, budget and quality requirements.

  • Acting as the primary mechanical engineering interface with clients and project stakeholders.

  • Representing the business at client, design and construction coordination meetings.

  • Coordinating local, interstate and global design resources to deliver efficient project outcomes.

  • Undertaking site inspections, construction-phase services and technical issue resolution.

  • Providing technical governance and peer review for mechanical engineering deliverables.

  • Contributing to recruitment, workforce planning and capability development initiatives.

  • Supporting strategic planning, technical practice development and knowledge-sharing activities across the Building Services business.

  • Delivering proposals, fee estimates and technical inputs for pursuits and bids.

  • Promoting innovation, sustainability and digital engineering practices in project delivery.

About you

Desirable Experience and qualifications

  • Degree in Mechanical Engineering or equivalent.

  • Chartered Engineer status (CPEng) or demonstrable pathway towards chartership preferred.

  • Significant experience in mechanical building services design within a consulting environment.

  • Experience delivering complex projects across sectors such as aviation, health, education, commercial, life sciences or major infrastructure-related buildings.

  • Strong understanding of NCC, Australian Standards, energy efficiency requirements, smoke control and ventilation design principles.

  • Experience with Revit/BIM-enabled design delivery and mechanical engineering analysis tools.

Key Skills

  • Curious, experimental, and proactive mindset towards digital innovation.

  • Collaborative working style with multidisciplinary engineering teams.

  • Strong communication skills, able to explain technical workflows to non-technical users.

  • Comfortable working in an iterative, prototype-driven environment.

Our company, values, and benefits

Mott MacDonald celebrates diversity and inclusion, offering a supportive work environment that values work-life balance, diversity, inclusion, and equity. We welcome diverse applicants, including First Nations People, people with disabilities, members of the LGBTQIA+ community, and people of all genders, neurodiversity, cultural backgrounds, age groups, and those with intersectional identities.

We offer a range of diverse benefits and facilities to make this a great place to be, including:

  • Agile working environment, supporting our people to work flexibly

  • Discretionary Group and Personal Performance Bonuses for eligible employees

  • Employee resource groups including the Inclusive Network for Women, Corporate Social Responsibility and more

  • Annual Health Checks and ongoing professional development


You've got this!

We endorse a diverse and inclusive workplace, and look to provide suitable opportunities for employees . Please apply if you are interested !

#LI-JS1

Apply now

Company benefits

Accrued annual leave
Adoption leave – 26 weeks full pay
Annual bonus
Annual pay rises
Bank holiday swaps
Bike parking
Book swaps
Buddy scheme
Buy or sell annual leave
Carer’s leave – up to 5 days, two of which are paid
Compassionate leave
Critical Illness Insurance
Cycle to work scheme
Dental coverage
Employee assistance programme
Employee discounts
Enhanced maternity leave – 26 weeks full pay
Enhanced paternity leave – 2 weeks
Enhanced pension match/contribution – matched up to 7%
Enhanced sick pay
Ergonomic workstations
Eye Care Support – Eyecare vouchers
Faith rooms
Fully stocked snack cupboard
Further education support
Health assessment
In house training
Income protection
L&D budget
Learning platform
Life assurance
Life insurance – 4 x salary
Lunch and learns
Meditation space
Meditation space
Mentoring
Modern office
On-site shower
On-site yoga classes
Open to part time work for some roles
Open to part-time employees
Pregnancy loss leave
Pregnancy support
Private booths
Private GP service – Private Medical care for all UK staff
Professional subscriptions – We pay for your primary professional annual subscription
Referral bonus
Religious celebration leave
Reservist leave – 10 days leave
Returnship
Salary sacrifice
Share options
Shared parental leave – We match up to 24 weeks full pay
Study support
Tax-free childcare
Teambuilding days
Theme park discounts
Travel loan
Women’s health leave
Menopause support
Women’s health support
Collaboration spaces

Working at Mott MacDonald

Company employees:

18,000 worldwide

Gender diversity (m:f:n-b):

0:35:65

Hiring in countries

Australia

Bulgaria

Canada

Colombia

Czechia

Germany

Hong Kong

India

Ireland

Italy

Japan

Malaysia

New Zealand

Awards & Accreditations

Best Employee Wellbeing

Top 5 - Best Employee Wellbeing

Flexa awards 2026
Best Career Progression

Top 10 - Best Career Progression

Flexa awards 2026
2nd - Best Career Progression

2nd - Best Career Progression

Flexa awards 2025
3rd - Most Family Friendly Company

3rd - Most Family Friendly Company

Flexa awards 2025
Most Flexible Company

Top 5 - Most Flexible Company

Flexa awards 2025
Best Work-Life Balance

Top 5 - Best Work-Life Balance

Flexa awards 2025
Best Workplace Culture

Best Workplace Culture

Flexa awards 2025

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Office Locations

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    Sydney, NSW, AU

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    Lead Mechanical Engineer

    Adelaide, SA, AU; Sydney, AU; Docklands, VIC, AU

  • Mott MacDonald

    Mechanical Engineer

    Christchurch, NZ; Auckland, NZ

  • Mott MacDonald

    Mechanical Engineer

    Auckland, NZ; Christchurch, NZ