Principal Mechanical Engineer, Water Sector

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 Solutions team, with flexibility to be based out of one of our South West, (Exeter, Bristol & Cardiff).

In this role, you’ll 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 700 experts across the UK & Ireland, including 170 specialists across our England & Wales Water Solutions team. Collaborate with top-tier civil, mechanical, electrical, and process engineers to deliver a variety of captivating projects, from small initiatives to large-scale ventures, all the way from concept to completion. Here, you’ll thrive in an inclusive and forward-thinking environment where your contributions are valued.

Enjoy the Perks.

At AECOM you'll enjoy a range of core and personalised benefits designed to support your future and well-being, customised to fit your lifestyle. Take advantage of career development opportunities, our flexible hybrid working model to ensure a work-life balance that suits your lifestyle, technical practice networks, AECOM University, and volunteering days.