Senior Principal Mechanical Engineer

Senior / Principal Mechanical Engineer (Water)

Working Location

Hemel Hempstead

Permanent

About the Role

If you are a mechanical engineer ready to step into a more senior position, this is an opportunity to take ownership of design delivery while supporting wider project and team development.

The role sits within an engineering team working across long-term water programmes, playing a key part in delivering high-quality mechanical design across a range of projects.

Why This Role Stands Out

• Step into a senior role with real design ownership
• Work across clean and wastewater projects
• Opportunity to support and guide junior team members
• Exposure to full project lifecycle and supplier engagement
• Strong pipeline of AMP work secured

Key Responsibilities

• Delivering mechanical design outputs in line with safety and quality requirements
• Producing calculations, drawings, and technical documentation
• Leading coordination with CAD technicians and supporting their development
• Managing interfaces with subcontract design teams (including M&E)
• Preparing scopes and reviewing third-party design outputs
• Engaging with suppliers, reviewing tenders, and supporting equipment selection
• Producing reports, specifications, and design investigations
• Ensuring compliance with relevant standards and engineering practices
• Managing design changes and ensuring accurate documentation
• Supporting estimation and planning of design activities
• Attending and presenting at technical and client meetings

Requirements

• Experience in mechanical design within the UK water sector
• Exposure to both clean water and wastewater projects (infrastructure and non-infrastructure)
• Experience with hydraulic design and associated calculations
• Knowledge of programmes such as UMON or similar upgrade schemes
• Understanding of construction methods and engineering drawing practices
• Chartered Engineer status, or working towards chartership
• Strong technical, communication, and problem-solving skills
• Experience supporting or mentoring junior engineers and technicians
• Degree, HND, or equivalent experience