Senior Mechanical Engineer – Water & Wastewater (Flexible)

MWH Treatment; Hattersley; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

MWH Treatment is seeking a Senior Mechanical Engineer to lead mechanical design for major water and wastewater projects in the Northern Region. You will develop buildable concepts, manage specifications and liaise with process, EICA, civil, structural and commissioning teams.

The role emphasizes mentoring junior engineers, delivering safe, sustainable and cost-effective solutions, and ensuring compliance with regulatory standards and client requirements.

Qualifications

• Strong experience in mechanical design within the water, wastewater, utilities or a similarly regulated engineering environment.
• Experience producing and reviewing mechanical calculations, equipment specifications, technical reports, schedules and design documentation.
• Membership of a relevant professional institution, ideally Chartered or working towards Chartership.

Responsibilities

• Lead mechanical design tasks and packages to agreed technical standards, budgets and programmes.
• Develop mechanical designs, equipment specifications, plant layouts and technical documentation that support safe, efficient and reliable asset performance.
• Produce cost-effective mechanical solutions that consider construction, commissioning, operational and whole-life costs.
• Review and assure mechanical design outputs within your area of authority, ensuring quality and compliance with company and industry standards.
• Coordinate mechanical design activities with Process, EICA, Civil, Structural, Digital and Commissioning teams to support integrated project delivery.
• Identify and manage technical risks, design issues and opportunities for optimisation throughout the project lifecycle.
• Support the design and selection of mechanical equipment, including pumps, pipework, valves, treatment plant equipment and associated systems.
• Mentor junior engineers, graduates and apprentices, sharing knowledge and supporting technical development across the team.
• Build strong working relationships with clients, discipline leads, project teams, suppliers and site teams.

Skills

Mechanical design

Project leadership

Mentoring

Multidisciplinary coordination

UK driving licence

Present proposals

Education

Mechanical Engineering degree

HND in related discipline

Job description

MWH Treatment is seeking a Senior Mechanical Engineer to lead mechanical design for major water and wastewater projects in the Northern Region. You will develop buildable concepts, manage specifications and liaise with process, EICA, civil, structural and commissioning teams.

The role emphasizes mentoring junior engineers, delivering safe, sustainable and cost-effective solutions, and ensuring compliance with regulatory standards and client requirements.