Senior Mechanical Design Engineer

About the job

Are you an experienced Mechanical Design Engineer looking to make a real impact on the future of the UK water industry? We’re looking for a Senior or Principal Mechanical Design Engineer to join our in‑house design team, delivering innovative, low‑carbon water treatment solutions across the UK. This is an exciting opportunity to play a key role throughout the full project lifecycle from concept and detailed design through to implementation while helping to develop the next generation of engineers.

• Lead the mechanical design of water treatment projects from concept through to delivery.
• Produce and review high‑quality mechanical design deliverables.
• Ensure designs comply with client specifications, industry standards and regulatory requirements.
• Coordinate design reviews, checking and approval processes.
• Mentor and support junior engineers, helping to build a high‑performing design team.
• Prepare work scope estimates and quotations.
• Champion health & safety, quality and environmental best practice.
• Collaborate with clients, project teams and key stakeholders.
• Manage design changes and support project programme delivery.

• Degree, HND or HNC in Mechanical Engineering (or equivalent).
• Chartered Engineer status (or working towards it) with a recognised professional body.
• Strong mechanical design experience within the municipal water or wastewater sector.
• Experience working within multidisciplinary engineering teams.
• Design management experience.
• Knowledge of programme and financial management.
• Experience across all project phases, including optioneering, FEED, detailed design, construction support and As‑Built documentation.
• The ability to manage multiple projects simultaneously.
• A full UK driving licence.

• Competitive salary based on experience
• Car allowance
• Private healthcare
• 31 days annual leave, increasing to 33 days after two years’ service
• Holiday Buy/Sell Scheme
• Company pension
• Professional membership fees paid
• Cycle to Work Scheme
• EV/Hybrid Car Lease Scheme
• Discounted gym membership
• Employee discount platform
• Structured career development with genuine opportunities for progression
• Access to occupational health services and mental health support

If you’re looking to work on innovative engineering projects that make a lasting environmental impact, we’d love to hear from you. Apply today or get in touch for a confidential conversation.