Senior Engineer - Mechanical - South Division

MWH Treatment; Hattersley; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

MWH Treatment is recruiting a Senior Mechanical Engineer to strengthen our Southern Division. You will lead mechanical design across major water and wastewater projects, delivering robust, buildable solutions that meet client requirements and asset performance goals.

Join a team focused on safety, sustainability and innovation, with flexible working options. You will mentor engineers and collaborate with Process, EICA, Civil and Commissioning teams to deliver complex schemes from concept to

Qualifications

• Experience in mechanical design for water/wastewater projects in regulated environments.
• Ability to develop practical, buildable mechanical solutions considering safety and life-cycle costs.
• Experience leading or mentoring engineers within a mechanical discipline.
• Membership of a relevant professional institution is preferred or in progress.

Responsibilities

• Lead mechanical design tasks and packages to meet technical standards, budgets and programmes.
• Develop mechanical designs, equipment specs, plant layouts and documentation for asset performance.
• Produce cost‑effective solutions covering construction, commissioning and operation costs.
• Review outputs to ensure quality and compliance with standards and company policy.
• Coordinate design activities with Process, EICA, Civil, Structural, Digital and Commissioning teams.
• Identify and manage risks and opportunities across the project lifecycle.
• Support selection of equipment such as pumps, pipework, valves and treatment plant components.
• Mentor junior engineers, graduates and apprentices and share knowledge within the team.
• Build strong relationships with clients, discipline leads, project teams, suppliers and site personnel.

Skills

Mechanical design

Water & wastewater

Regulatory standards

Mentoring

Multidisciplinary coordination

Project leadership

Communication of proposals

Education

Bachelor's degree in Mechanical Engineering

HND in related discipline

Chartered or working towards Chartership

Job description

We are looking to strengthen our Engineering team with a Senior Mechanical Engineer to join our Southern Division with flexible working available.

Are you an experienced Senior Mechanical Engineer ready to help shape the successful delivery of complex water and wastewater infrastructure projects? At MWH Treatment, our Mechanical Engineers play a critical role in developing innovative, efficient and reliable mechanical solutions that help deliver safer, smarter and more resilient water services for our customers and communities.

We are looking for a Senior Mechanical Engineer to lead mechanical design activities across major projects, delivering robust, buildable solutions that meet client requirements, regulatory standards and long-term asset performance objectives.

What you'll be doing

• 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.

• EssentialStrong experience in mechanical design within the water, wastewater, utilities or a similarly regulated engineering environment.
• Good understanding of water and sewage treatment processes and the mechanical systems that support them.
• Experience producing and reviewing mechanical calculations, equipment specifications, technical reports, schedules and design documentation.
• Ability to develop practical, economic and buildable mechanical solutions that consider safety, sustainability, operability and whole-life cost.
• Experience coordinating multidisciplinary design teams and supporting project delivery.
• Experience leading, checking or mentoring engineers within a mechanical or related engineering discipline.
• Membership of a relevant professional institution, ideally Chartered or working towards Chartership.
• Relevant Mechanical Engineering degree preferred, or a minimum HND in a related discipline.
• Ability to present technical proposals clearly, confidently and commercially.
• Computer literacy and a full UK driving licence.

Why join us?

At MWH Treatment, mechanical engineering is at the heart of how we design and deliver reliable, sustainable and future-ready water and wastewater infrastructure. You will have the opportunity to influence critical projects from concept through to completion, working with talented multidisciplinary teams to create solutions that make a real difference for customers, communities and the environment. Work on technically varied mechanical challenges across major water and wastewater infrastructure projects. Help deliver safer, smarter and more sustainable infrastructure through innovative mechanical design. Join a collaborative design-and-build environment where mechanical expertise influences key project decisions. Develop your career through mentoring, professional development and exposure to complex multidisciplinary schemes. Be part of a business focused on safety, sustainability, innovation and delivering the best outcomes for customers, communities and the environment.