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Principal Mechanical Engineer, Water & Wastewater; Hybrid

Remote / Online - Candidates ideally in
City of Edinburgh, Edinburgh, City of Edinburgh Area, EH1, Scotland, UK
Listing for: AECOM
Full Time, Remote/Work from Home position
Listed on 2026-05-28
Job specializations:
  • Engineering
    Environmental Engineer, Water Engineer, Civil Engineering, Water Management
Salary/Wage Range or Industry Benchmark: 125000 - 150000 GBP Yearly GBP 125000.00 150000.00 YEAR
Job Description & How to Apply Below
Position: Principal Mechanical Engineer, Water & Wastewater (Hybrid)
Location: City of Edinburgh

Company Description

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 world’s most complex challenges and build legacies for future generations.

There has never been a better time to be h 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.

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…
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