Principal Mechanical Engineer,Water Sector

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.

Are you ready to shape the future of water infrastructure? We’re looking for a Principal Mechanical Engineer to join our growing Water team, with opportunities to be based across our South East offices - Basingstoke, Croydon, London Aldgate and St Albans. In this role, you’ll play a key part in delivering major UK water utility investment programmes, supporting the design and delivery of projects that range from small rural sites to multi-million-pound infrastructure and non-infrastructure schemes.

You will support the delivery of several high-value capital programmes, including:

• South West Water – Framework for Engineering Consultancy Services: Lot 3 - Multi-Discipline Engineering Design
• Wessex Water – Capital Delivery Partner Framework Agreement: Lot 2 - Design Consultant
• Severn Trent Water – Lot 1 Major Projects Framework: Supporting AMP8 delivery plan valued at a TotEx of £14.9 billion
• Severn Trent D&B Projects – Supporting Tier 1 contractors on major non-infrastructure wastewater schemes
• Southern Water Strategic Delivery Partner (SDP) Frameworks: Lot 1: Non-infrastructure water projects; Lot 2: Non-infrastructure wastewater projects
• Southern Water Low Complexity and Infrastructure Frameworks: Lot 2: Wastewater Infrastructure; Lot 3: Infrastructure Framework – Partnering exclusively with Tier 1 contractors to deliver efficient and sustainable water and wastewater solutions

Working flexibly, you’ll visit client sites and collaborate with teams across multi-year frameworks. As part of our thriving business, you’ll take on rewarding multi-disciplinary projects from inception to delivery, creating innovative solutions that enhance the environment and improve 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.

Become part of our dynamic Water business, which boasts over 600 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.

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.

Here’s what we’re looking for:

• A degree in Mechanical Engineering with Chartered Engineer status (or working towards it) through a recognised institution like IMechE.
• Proven expertise in producing, reviewing, and approving engineering reports, designs, drawings, and specifications.
• A problem-solver at heart, confident in taking ownership of challenging technical issues and seeing them through to resolution.
• Leadership potential, able to manage direct reports, inspire technical excellence, and support the growth of fellow engineers.
• Exceptional client and stakeholder engagement skills, with experience in team leadership, mentoring, and line management.
• Experience in the water and/or wastewater industry.

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!