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 Water Solutions team in London, St Albans, Croydon, or Basingstoke. In this role, you’ll support the delivery of Southern Water's £3.7 billion capital delivery programme, working on projects ranging from small rural sites to multi-million-pound schemes, covering both water and wastewater (Infrastructure and Non-Infrastructure). The frameworks run for seven and five years, respectively, with the option to extend for an additional 5 years. You’ll have the opportunity to contribute to two major frameworks as part of this investment: Strategic Delivery Partner (SDP) Framework: Supporting our Tier 1 Contractor on Lot 1 (non-infrastructure water projects) and Lot 2 (non-infrastructure wastewater projects). Low Complexity Delivery Route Lot 2 (Wastewater Infrastructure) Framework and Strategic Delivery Partner (SDP) Lot 3 Infrastructure Framework: Partnering exclusively with a Tier 1 contractor to deliver sustainable, high-quality water and wastewater solutions. Working flexibly from Southern UK locations, you’ll visit client sites in and around Brighton 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. By joining AECOM, you’ll be provided with a comprehensive benefit package, including competitive pay, highly rated healthcare, a company pension, and a Sharesave scheme 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. AECOM’s digital strategy is driving the adoption of global digital solutions internally in our design process, to improve quality and consistency and streamline activities. You will help shape these digital offerings and use them on projects, including BIM, Projectwise, intelligent P&ID’s and AECOM’s own tools developed in-house, such as our pumping station generator. 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.