Principal Mechanical Engineer

Job Description

Start here. Grow here.

At AECOM, we boast an impressive and expansive Water Team operating across the globe. With approximately 600 experts sitting in our UK and Ireland Offices, we are constantly evolving to remain at the forefront of innovation, and we’re on the lookout for talented, dedicated and passionate individuals to join us.

Our Water Team in Scotland are delivering a diverse and high-impact portfolio of projects that are shaping sustainable and resilient water systems for generations to come. One of our most recent wins includes Scottish Water’s SR27 Enterprise. AECOM has been named preferred bidder for one of two Primary Designers on this transformational, multi-billion-pound programme. It is the highest value venture ever put into place by Scottish Water and will reshape Scotland’s water and wastewater infrastructure from 2027 to 2033 (with potential to extend for another 6 years).

AECOM will be at the heart of this ground-breaking delivery model, shaping design excellence at scale and working with Scottish Water and our Enterprise Partners to help drive outcomes that deliver value for customers in Scotland and go beyond net zero. This is a major win for AECOM and a powerful endorsement of our expertise, giving us a fantastic opportunity to deliver long-term, meaningful work that has large scale impact for communities across Scotland. This position offers an unparalleled opportunity to support on this programme and work alongside a talented, diverse team committed to innovation and efficiency.

Join our dynamic and multidisciplinary Water Team as a Principal Mechanical Engineer in one of our Scotland offices – whilst also taking advantage of work from home days through our hybrid work approach.

Here's what you'll do:

• Prepare feasibility studies, outline design, detailed design and construction support
• Produce Plant layouts, design drawings and mechanical plant selection including specifications, WIMES Data Sheets, Valve schedules, Equipment Schedules, lifting strategies, hydraulic headloss calculations and P&IDs. For Water Projects
• Liaise and collaborate with our water and other discipline teams including civil, electrical, process and mechanical engineers nationwide
• Visit site to carry surveys and support of liaisons with clients, contractors & suppliers
• Lead and contribute design review meeting such as HAZOPs, HAZIDs, ALMs and SWIFTS
• Act as Mechanical Lead on projects including WwTW, WTW and Infrastructure. Supporting the Project Manager and Design Lead to successfully deliver the Mechanical Scope to programme and budget
• Assist the Project Manager to set realistic programmes and budgets for Mechanical projects
• Be a Line manager for Mechanical Graduate, Engineer and Senior Engineers

Enjoy the Perks.

You’ll thrive in an inclusive and forward-thinking environment where your contributions are valued - and let's not forget the perks! At AECOM, you'll enjoy a range of core benefits designed to support your future and well-being, and flexible benefits you can customise to suit your lifestyle. Take advantage of our technical practice networks, AECOM University, and volunteering days to accelerate your career development, and utilise our flexible hybrid working model to create a healthy work-life balance. We recognise that everyone’s circumstances are different, so we’re more than happy to discuss part-time or flexible working arrangements.

If you're passionate about innovation and turning bold ideas into reality, we want to hear from you. Follow our AECOM Water page on LinkedIn to stay updated on the impactful projects we're working on and see firsthand the difference we're making in the industry! 

Qualifications

Ready to push the limits of what’s possible?

Here’s what we’re looking for:

• A degree (or equivalent) in Mechanical Engineering
• Be a Chartered Engineer with a relevant institution, such as IMechE
• A proven ability to deliver engineering designs, reports, drawings, technical specifications, and calculations with confidence and precision
• Hands-on experience in delivering innovative solutions for water and wastewater engineering projects

We celebrate diversity, including neurodiversity, and believe it enriches our team. We welcome applications from all backgrounds and abilities. If you are an applicant with a disability that requires reasonable accommodation to complete the application process, please contact us at [email protected]. At AECOM, we value everyone's unique contributions and perspectives.

If you meet some of the requirements above or have transferable skills you believe would benefit us, we would be delighted to hear from you!

Additional Information

Interested in the role or curious about life at AECOM? Follow us on LinkedIn, Facebook, Instagram, and YouTube to explore our AECOM voices, employee stories, latest projects, and much more!

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.

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 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, benefits and well-being programs to meet the diverse needs of our employees and their families. 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.

We are a Disability Confident Employer and will offer an interview to applicants who have a disability or long-term condition, who meet the minimum/essential criteria for the role. Please let us know using this email address [email protected]  if you would like to apply through the Disability Confident Interview Scheme.

All your information will be kept confidential according to EEO guidelines.