Principal Mechanical Engineer – Water Infrastructure

About the role

AECOM is expanding its Water Infrastructure team in Melbourne to deliver sustainable water and wastewater solutions across Australia. As a Principal Mechanical Engineer you will lead feasibility studies, detailed designs and construction support for large‑scale water projects, working closely with multidisciplinary teams and clients.

Key responsibilities

• Prepare feasibility studies, outline and detailed designs, and provide construction support for water and wastewater projects.
• Produce plant layouts, design drawings, mechanical plant selections, specifications, valve and equipment schedules, lifting strategies, hydraulic head‑loss calculations and P&IDs.
• Collaborate with civil, electrical, process and other mechanical engineers across national and international offices.
• Conduct site visits, surveys and liaise with clients, contractors and suppliers.
• Participate in design review meetings such as HAZOP, HAZID, ALM and SWIFT.

Required profile

• Degree in Mechanical Engineering (or equivalent).
• Progress toward Chartered status with IMechE or Engineers Australia.
• Proven experience delivering engineering designs, reports, drawings and technical specifications for water and wastewater projects.
• Hands‑on experience with innovative solutions in water treatment and asset management.

Required skills

• Hydraulic modelling and related software, including network hydraulic grid modelling, new connection analysis and transient/surge modelling.
• Plant layout and mechanical design tools for creating P&IDs, valve schedules and equipment schedules.
• Ability to perform hydraulic head‑loss calculations and develop lifting strategies.

What we offer

• Flexible work arrangements – hybrid, alternative start/finish times, part‑time and job‑sharing options.
• Purchase up to six weeks of additional annual leave per year.
• Volunteer and representation leave, and flexible public holidays.
• Inclusive culture with diversity, equity and inclusion initiatives.