Senior​/Principal Mechanical Engineer

Position: Senior / Principal Mechanical Engineer
Location: London Colney

Senior Mechanical Design Engineer

Water & Wastewater Infrastructure

Location:

St Albans

Employment Type:

Permanent

The Opportunity

Our client is seeking an experienced Senior Mechanical Design Engineer to join their growing engineering team delivering major water and wastewater infrastructure projects. This is an excellent opportunity for a technically strong engineer with extensive design experience in the water sector to take ownership of complex mechanical design packages, mentor junior engineers, and contribute to the successful delivery of high-profile projects.

The successful candidate will play a key role in the development, coordination, and delivery of mechanical engineering designs, ensuring compliance with industry standards, client requirements, and project objectives.

Key Responsibilities

Produce high-quality mechanical design deliverables that meet safety, quality, and regulatory requirements.
Develop mechanical designs, calculations, drawings, reports, and technical specifications for water and wastewater projects.
Undertake hydraulic design and analysis for a range of treatment and infrastructure schemes.
Lead and mentor CAD technicians, graduate engineers, and junior design staff.
Prepare scopes of work for subcontracted M&E design teams and review their outputs for technical accuracy and compliance.
Liaise with equipment suppliers, manufacturers, contractors, and project stakeholders throughout the design process.
Ensure all designs comply with relevant industry standards, professional guidelines, and company procedures.
Manage and record design changes throughout the project lifecycle.
Estimate design hours and support project planning and resource allocation.
Attend and present at design reviews, client meetings, technical workshops, and project presentations.
Collaborate with multidisciplinary engineering teams to deliver integrated design solutions.

Required Qualifications & Experience

Minimum 10 years' mechanical design experience within the water industry.
Significant experience in hydraulic design and water sector engineering projects.
Awareness and understanding of electrical design principles and control systems.
Degree-qualified or HND-qualified in Mechanical Engineering or a related discipline.
Strong IT skills, including engineering design software and Microsoft Office applications.
Membership of a recognised professional engineering institution and actively working towards professional chartership.

Preferred Qualifications & Experience

Chartered Engineer (CEng) status.
Experience in electrical engineering and/or control systems engineering.
Proven experience across both clean water and wastewater treatment projects.
Good understanding of construction methods, installation practices, and engineering materials.
Strong knowledge of engineering drawing standards and best practices.

Key Skills & Competencies

Technical Skills

Mechanical engineering design
Hydraulic calculations and analysis
Engineering specifications and technical reporting
Design review and quality assurance
Multidisciplinary engineering coordination
Water and wastewater treatment processes

Personal Attributes

Excellent communication and stakeholder management skills
Strong problem-solving and analytical abilities
Results-driven and delivery-focused approach
Ability to lead, mentor, and develop junior team members
Strong attention to detail and commitment to quality
Effective planning, organisation, and time management skills

What Our Client Is Looking For

The ideal candidate will be a proactive and technically capable Senior Mechanical Design Engineer who can lead design activities from concept through to detailed design and delivery. You will have a collaborative approach, strong commercial awareness, and the ability to provide technical leadership while supporting the development of less experienced engineers.

If you are looking to join a forward-thinking engineering organisation delivering essential water infrastructure projects, we would be keen to hear from you