Senior Engineer - Process - UK Wide

MWH Treatment Limited; Hattersley; Hybrid; GBP 65,000 - 90,000; Full time

Job summary

MWH Treatment Limited is seeking a Senior Process Engineer for a UK-based role with flexible working. You will lead process design across major water and wastewater projects, delivering robust and buildable solutions that meet regulatory standards and long-term performance goals.

You will collaborate with multi-disciplinary teams, support optioneering and design development, and mentor junior engineers while delivering safe, sustainable infrastructure for customers and communities.

Qualifications

• Strong experience in process design within water and wastewater.
• Ability to produce process calculations, flow diagrams and design reports.
• Experience supporting optioneering, feasibility and detailed design.
• Chartered status or working towards Chartership preferred.
• Ability to present technical proposals clearly and commercially.

Responsibilities

• Lead process design tasks to agreed technical standards, budgets and programmes.
• Develop process calculations, philosophies, plant layouts and design documentation.
• Support optioneering, process selection and technical decision-making across schemes.
• Review and assure outputs within your area of authority.
• Coordinate design with mechanical, civil, digital, hydraulic and commissioning teams.
• Identify process risks and opportunities for optimisation across lifecycle.
• Mentor junior engineers, graduates and apprentices.
• Build strong client relationships and engage with suppliers and site teams.

Skills

Process design

Water treatment

Regulatory standards

Optioneering

Mentoring

Client coordination

Team collaboration

Leadership

Whole-life cost

Education

Engineering degree

Chartered engineer (or pursuing)

Process/environmental/water degree

Job description

We are looking to strengthen our Engineering team with a Senior Process Engineer based at a suitable location within the UK, with flexible working available.

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

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

Key Responsibilities:

• Lead process design tasks and packages to agreed technical standards, budgets and programmes.
• Develop process calculations, treatment philosophies, plant layouts and design documentation that support efficient and reliable asset performance.
• Support optioneering, process selection, design development and technical decision-making across water and wastewater treatment schemes.
• Review and assure process design outputs within your area of authority.
• Coordinate process design with mechanical, EICA, civil, digital, hydraulic and commissioning teams to support integrated project delivery.
• Identify process risks, treatment performance requirements and opportunities for optimisation across design, construction, commissioning and operation.
• Mentor junior engineers, graduates and apprentices, sharing specialist process knowledge across the team.
• Build strong working relationships with clients, discipline leads, project teams, suppliers and site teams.

Essential:

• Strong experience in process design within water, wastewater, process, utilities or a similarly regulated engineering environment.
• Good understanding of water and sewage treatment principles, including process selection, treatment performance and regulatory requirements.
• Ability to produce and review process calculations, process flow diagrams, design philosophies, specifications and technical reports.
• Experience supporting optioneering, feasibility, outline design, detailed design, commissioning support or performance optimisation.
• Ability to produce practical, economic and buildable process solutions that consider whole-life cost, safety, carbon and operational performance.
• Experience leading, checking or mentoring engineers within a process or related engineering discipline.
• Membership of a professional institution, ideally Chartered or working towards Chartership.
• Relevant engineering qualification, ideally a process, chemical, environmental, civil or water engineering degree, or minimum HND in a relevant discipline.
• Ability to present technical proposals clearly, confidently and commercially.
• Computer literacy and a full UK driving licence.

Why join us?

At MWH Treatment, process engineering is at the heart of how we design and deliver reliable, sustainable and future-ready water and wastewater treatment solutions. You will have the opportunity to influence critical infrastructure projects from early concept through to delivery, working with talented multidisciplinary teams to create treatment solutions that make a real difference for customers, communities and the environment. Work on technically varied process challenges across major water and wastewater treatment projects.Help deliver safer, smarter and more sustainable infrastructure through innovative treatment design.Join a collaborative design-and-build environment where process 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 doing the right thing for customers, communities and the environment.