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
Only candidates based in UK and eligible to work in UK are allowed