Senior Mechanical Design Engineer

Dalkia UK; Greater London; On-site; GBP 45,000 - 70,000; Full time

Job summary

Dalkia UK is seeking a highly experienced Mechanical Design Engineer to deliver innovative decarbonisation and energy infrastructure projects across hospitals, universities and industrial sites. You will develop mechanical designs from concept to detailed design, produce specifications and schematics, and coordinate with internal teams and external consultants throughout the project lifecycle.

Joining our growing design team means supporting low‑carbon solutions, energy efficiency and net‑zero

Qualifications

• Degree in Mechanical or Electrical Engineering.
• 3–5+ years in building services, energy, infrastructure or M&E.
• Experience with HVAC, steam, heating, chilled water and domestic water systems.
• Knowledge of heat pumps, boilers, CHP and chillers.
• Ability to produce schematics and concept layouts using AutoCAD.
• Understanding commissioning and engineering documentation.
• Strong communication and problem‑solving skills.
• Experience working in live operational environments is advantageous.

Responsibilities

• Develop mechanical designs from concept to detailed design.
• Produce and review specifications, schematics and technical documentation.
• Coordinate designs with internal engineering teams and external consultants.
• Support the delivery of low‑carbon and energy efficiency projects.
• Ensure designs are practical, buildable and compliant with relevant standards.
• Participate in site surveys, inspections and client meetings.
• Support construction, commissioning and handover activities.
• Identify and help mitigate technical and operational risks.
• Work collaboratively with project, electrical and controls engineers to deliver integrated solutions.

Skills

HVAC systems

Problem solving

Communication

Live environments

Education

Bachelor's degree in Mechanical or Electrical Engineering

Tools

AutoCAD

Job description

About Dalkia UK

At Dalkia, we're driven by a shared purpose: tackling climate change and building a better, more sustainable future. We bring together talented people who share knowledge, challenge each other and grow together.

About Dalkia UK

At Dalkia, we're driven by a shared purpose: tackling climate change and building a better, more sustainable future. We bring together talented people who share knowledge, challenge each other and grow together.

Backed by EDF, Britain's biggest generator of low carbon electricity, we're a people-first culture. With 5,000+ employees and £600m+ turnover, we combine the strength of a major group with a great culture, innovative mindset and inclusive values making Dalkia a great place to work and grow your career.

Mechanical Design Engineer

Design innovative energy and decarbonisation solutions. Deliver projects that make a real impact.

We're looking for a highly experienced, talented engineer to join our growing design team, delivering innovative decarbonisation and energy infrastructure projects across complex, live operational environments such as hospitals, universities, and industrial sites. This is an opportunity to work on cutting‑edge energy technologies while helping organisations achieve ambitious net‑zero goals.

From large‑scale energy centres and heat pumps to district heating, chilled water systems and plant rooms, you'll play a key role in developing high‑quality engineering solutions that improve performance, resilience and sustainability.

This is an exciting opportunity to work on a diverse portfolio of projects involving energy centres, heat pumps, CHP, steam and hot water systems, chilled water systems, BMS, standby generation and other critical infrastructure. You'll be involved throughout the project lifecycle, from concept development and detailed design through to construction support and commissioning.

What you'll be doing:

• Developing mechanical designs from concept through to detailed design
• Producing and reviewing specifications, schematics and technical documentation
• Coordinating designs with internal engineering teams and external consultants
• Supporting the delivery of low‑carbon and energy efficiency projects
• Ensuring designs are practical, buildable and compliant with relevant standards
• Participating in site surveys, inspections and client meetings
• Supporting construction, commissioning and handover activities
• Identifying and helping to mitigate technical and operational risks
• Working collaboratively with project, electrical and controls engineers to deliver integrated solutions

What we're looking for:

• Degree qualified in Mechanical or Electrical Engineering
• 3–5+ years' experience within building services, energy, infrastructure or M&E environments
• Experience with HVAC, steam, heating, chilled water and domestic water systems
• Knowledge of major plant including heat pumps, boilers, CHP and chillers
• Ability to produce engineering schematics and concept layouts using AutoCAD
• Understanding of commissioning, testing and engineering documentation
• Strong communication and problem‑solving skills
• Experience working within live operational environments would be advantageous

Why join us?

This is an opportunity to work on challenging projects that directly contribute to sustainability, energy efficiency and Net Zero goals. You'll gain exposure to a wide range of technologies and work alongside experienced engineers in a collaborative and supportive environment where professional development is encouraged.

If you're passionate about engineering, sustainability and delivering practical solutions to complex challenges, we'd love to hear from you.

Our Values

People First – It starts with health, safety and wellbeing

Better Together – A collaborative team

Trusted Partners – Dedicated to our clients' success

Taking Responsibility – Making a positive difference

Equity, Diversity & Inclusion

We're committed to an inclusive and fair recruitment process. If you need any adjustments please let us know, in confidence, our team is here to support you.