Principal Mechanical Engineer, Water Sector

Overview

As Principal Mechanical Engineer, you will help shape large-scale water infrastructure across the UK by delivering multi‑billion pound capital programmes. You will lead mechanical design for water and wastewater systems within a multidisciplinary team, from feasibility through delivery, ensuring high technical quality and strong client relationships. You’ll influence frameworks and projects across South West and Wales, collaborating with global centres to provide innovative MEICA solutions. This role offers impact across communities and the environment, with opportunities to grow within a leading, global infrastructure firm.

Pay / Benefits

• flexible hybrid working
• career development opportunities
• AECOM University
• volunteering days
• personalised benefits
• supportive inclusive environment

Responsibilities

• Develop feasibility studies, outline and detailed designs, and provide construction support
• Create design drawings, select mechanical plant, and prepare technical specifications
• Collaborate with 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 targets
• Design mechanical installations for water and wastewater systems (pumps, screens, valves, odour control)
• Conduct site surveys and liaise with clients, contractors, and suppliers
• Produce layouts, technical specifications, datasheets, and P&IDs
• Collaborate with Enterprise Capabilities centres in India, South Africa and Romania

Key requirements

• A degree in Mechanical Engineering (or equivalent)
• Chartered Engineer status (or working towards)
• Proven expertise in pump station design, piping design, valve selection, hydraulics, and producing/approving engineering reports, designs, drawings, and specifications
• Experience in the water and/or wastewater industry

• Collaboration with multidisciplinary teams
• Client relationship management
• Communication and stakeholder management
• Pump station design
• Piping design
• Valve selection

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