Mechanical Engineering Principal Lead

Capgemini Engineering; West of England; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Open learning platforms

Diversity networks

Disability Confident Employer

Job summary

Capgemini is seeking a Mechanical Engineering Principal Lead / Decarbonisation Lead to drive heat decarbonisation programmes across industrial and infrastructure projects in a Bristol-based hybrid role. You will be the technical authority for low-carbon heating and thermal energy solutions, leading design reviews, modelling, and stakeholder engagement to cut carbon and improve energy efficiency.

You will mentor engineers, manage complex projects across the full lifecycle, and collaborate with

Qualifications

• Significant experience delivering heat decarbonisation, energy optimisation and low-carbon infrastructure projects.
• Proven ability to lead multidisciplinary teams and drive successful project delivery.
• Experience with feasibility studies, energy audits, and detailed design.

Responsibilities

• Lead heat decarbonisation strategies for industrial and manufacturing facilities.
• Oversee the design and delivery of low-carbon heating systems, including ASHPs and LTHW networks.
• Deliver thermal modelling, energy assessments, and feasibility studies to identify decarbonisation opportunities.
• Provide technical leadership for mechanical engineering standards, design reviews, risk assessments, and HAZOPs.
• Collaborate with clients, stakeholders, and multidisciplinary teams to deliver integrated energy solutions.
• Mentor engineers and drive innovation, continuous improvement, and carbon reduction initiatives.

Skills

Heat decarbonisation

Leadership

Stakeholder management

Thermal systems

HVAC

Education

Degree in Mechanical, Thermal, or Energy Engineering

Chartered Engineer (CEng) desirable

Tools

Energy modelling software

HAZOP

Job description

We're looking for a Mechanical Engineering Principal Lead / Decarbonisation Lead to drive heat decarbonisation programmes across industrial and infrastructure projects. As the technical authority, you'll lead the design and delivery of low‑carbon heating and thermal energy solutions, working closely with clients and multidisciplinary teams to improve energy efficiency, reduce carbon emissions, and deliver sustainable engineering outcomes.

• Lead heat decarbonisation strategies for industrial and manufacturing facilities.
• Oversee the design and delivery of low‑carbon heating systems, including ASHPs and LTHW networks.
• Deliver thermal modelling, energy assessments, and feasibility studies to identify decarbonisation opportunities.
• Provide technical leadership for mechanical engineering standards, design reviews, risk assessments, and HAZOPs.
• Collaborate with clients, stakeholders, and multidisciplinary teams to deliver integrated energy solutions.
• Mentor engineers and drive innovation, continuous improvement, and carbon reduction initiatives.

Your profile

You’ll be a degree-qualified Mechanical, Thermal, or Energy Engineer with significant experience delivering heat decarbonisation, energy optimisation, and low‑carbon infrastructure projects. With a strong understanding of the full project lifecycle, from feasibility and energy audits through to detailed design, you’ll bring deep technical expertise in thermal systems, HVAC, heat pumps, and energy performance. You’ll also be a confident leader, capable of managing stakeholders, leading multidisciplinary teams, and driving successful project delivery.

What We're Looking For

• Proven experience delivering large‑scale heat decarbonisation and energy efficiency programmes, including RIBA Stage 3 and 4 design projects.
• Strong knowledge of HVAC, heat pumps, thermal energy storage, heat recovery technologies, thermal modelling, and energy performance analysis.
• Experience leading design reviews, HAZOP studies, and engineering risk management activities.
• Degree qualified in a relevant engineering discipline, with Chartered Engineer (CEng) status desirable.
• Excellent stakeholder management, leadership, mentoring, and communication skills.

Make it real - what does it mean for you?

• Open access to digital learning platforms
• Active employee networks promoting diversity, equity and inclusion like OutFront, CapAbility or Women@Capgemini

Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government’s Disability Confident scheme. As part of our commitment to inclusive recruitment, we will offer an interview to all candidates who

• Declare they have a disability, and
• Meet the minimum essential criteria for the role.
• Please opt in during the application process.

Capgemini. Make it real.

Need to know

• All roles will require a level of security clearance; BPSS OR Security Clearance OR Developed Vetting.
• You can bring your whole self to work. At Capgemini building an inclusive future is part of everyday life and will be part of your working reality. We have built a representative and welcoming environment, for everyone.
• The role will be Bristol based - 2/3 days a week in office

About Capgemini

Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organisations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of over 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2025 global revenues of €22.5 billion.