Senior Mechanical Design Engineer – Water & Wastewater

Senior Mechanical Design Engineer – Water & Wastewater

Location: Hybrid (minimum 3 days per week in office/site)

Type: Permanent

The Role

An excellent opportunity has arisen for a Senior Mechanical Design Engineer to take a leading role within a growing design team, delivering high–quality mechanical solutions across a range of water and wastewater treatment projects.

You will take technical ownership of mechanical design packages from concept through to completion, ensuring all systems meet regulatory, safety, and client requirements. Working closely with multidisciplinary teams, you will deliver fully integrated solutions while supporting project delivery through design, procurement, installation, and commissioning stages.

This role also offers the opportunity to mentor junior engineers, influence best practice, and drive innovation and continuous improvement across projects.

Key Responsibilities

Lead the design and development of mechanical systems for water and wastewater treatment projects

Take ownership of designs from concept through to detailed design and delivery

Produce and review technical documentation, calculations, and specifications

Collaborate with multidisciplinary teams to ensure integrated design solutions

Conduct and support design reviews, risk assessments, and HAZOPs

Provide technical support during procurement, installation, and commissioning

Ensure compliance with industry standards, HSE requirements, and regulations

Mentor and support junior engineers within the team

Drive innovation, efficiency, and continuous improvement across projects

Experience Required

7–10 years' experience in mechanical design engineering

Ideally within the water or wastewater sector

Proven track record delivering mechanical designs on treatment or process–led projects

Strong knowledge of mechanical equipment such as pumps, pipework, valves, blowers, and filtration systems

Experience supporting commissioning, troubleshooting, and optimisation of systems

Skills & Competencies

Strong leadership and mentoring capabilities

Excellent problem–solving skills with a practical, solution–focused approach

Ability to manage multiple projects while maintaining quality and accuracy

Strong communication skills with the ability to engage stakeholders at all levels

Collaborative approach, working effectively across multidisciplinary teams

Good understanding of mechanical design standards, HSE, and environmental regulations

Qualifications

Degree in Mechanical Engineering or a related discipline

Chartered Engineer (CEng) status or working towards

Proficiency in design software such as AutoCAD, SolidWorks, or similar