Principal Mechanical Engineer, Water Sector

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.

Are you ready to shape the future of water infrastructure?

We’re looking for a Principal Mechanical Engineer to join our growing South West and Wales water team, with flexibility to be based out of one of our South West offices (Exeter, Bristol & Cardiff).You will play a key part in delivering multi-billion-pound capital programmes across the UK water sector, contributing to projects ranging from small rural sites to complex, multi-million-pound infrastructure and non-infrastructure schemes in both water and wastewater.

These long-term frameworks extend through AMP8 and AMP9, offering security, variety, and the opportunity to make a real impact in shaping sustainable water solutions.

You will contribute to several major frameworks, including:

Key Programmes You’ll Support:

South West Water – Engineering Consultancy Services Framework:
Lot 3 – Multi-Discipline Engineering Design Wessex Water – Capital Delivery Partner Framework:
Lot 2 – Design Consultants Southern Water – 3.7 billion Capital Delivery Programme:
Strategic Delivery Partner (SDP) Frameworks:
Supporting Tier 1 Contractors on:
Lot 1:
Non-infrastructure water projects & Lot 2:
Non-infrastructure wastewater projects

Low Complexity Delivery Route & SDP Lot 3 Infrastructure Frameworks:
Partnering exclusively with Tier 1 Contractors to deliver high-quality wastewater infrastructure projects.

With flexible working from our locations, you’ll collaborate across multi-disciplinary teams to deliver innovative and sustainable solutions. As part of AECOM, you’ll engage in impactful projects from inception through to delivery, enhancing the environment and supporting communities.

Here's what you'll do:

Develop feasibility studies, outline and detailed designs, and provide construction support.

Create design drawings, select mechanical plant, and prepare technical specifications.

Collaborate with multidisciplinary teams, including civil, electrical, process, and mechanical engineers.

Ensure high technical quality, contribute to bids, and maintain client relationships.

Manage project budgets, schedules, and deliverables to meet agreed targets.

Design mechanical installations for water and wastewater systems, including pumps, screens, valves, and odour control.

Conduct site surveys and liaise with clients, contractors, and suppliers.

Produce layouts, technical specifications, datasheets, and P&IDs for system designs.

As well as providing innovative and industry leading MEICA solutions to Clients, the team also collaborates with a wide variety of disciplines from other offices in delivering projects, including a close working relationship with our Enterprise Capabilities centres in India, South Africa and Romania.

Come grow with us.

Become part of our dynamic Water business, which boasts around 600 experts across the UK & Ireland.  Collaborate with top-tier engineers and consultants to deliver a variety of captivating projects, from small initiatives to large-scale ventures, all the way from concept to completion. At AECOM, you’ll thrive in an inclusive and forward-thinking environment where your contributions are valued.

Let's not forget the perks! You'll enjoy a range of core and personalised benefits…