Principal Mechanical Designer

Job Title: Principal Mechanical Design Engineer

Location: Crawley and London, with flexible working options (40% office attendance encouraged but adaptable based on personal circumstances and geographical location).

Who are we recruiting for?

We are recruiting on behalf of an award-winning, innovative cleantech company dedicated to enabling the transition to a zero-carbon future. The organisation is recognised for its cutting-edge solar thermal technologies that decarbonise heat and hot water, significantly reducing climate change impacts. Their growth is fuelled by a successful Series B fundraise, providing exciting opportunities for passionate professionals.

What will you be doing?

As a Principal Mechanical Design Engineer, you will:

• Lead the design of renewable heating systems using unique solar technology and complementary low-carbon technologies.
• Manage and grow a talented team of engineers to deliver design projects from conception to completion.
• Prepare costed designs, including P&ID designs, solar array layouts, component sizing, structural analysis, and construction planning.
• Uphold health and safety standards, signing off designs where necessary.
• Collaborate with internal teams, external engineers, and clients to develop reliable, economical systems.
• Provide technical support to the commercial team, assist in tendering processes, and engage with construction partners for costings.
• Present designs and proposals to clients, partners, and stakeholders.
• Contribute to product and software improvement initiatives for enhanced system performance.

Are you the ideal candidate?

The ideal candidate is:

• A qualified mechanical, HVAC, or building-services engineer with over 10 years of M&E design engineering experience.
• Educated with a relevant engineering degree or equivalent qualification.
• Confident in delivering and signing off designs up to RIBA Stage 4 and beyond.
• Proficient in engineering drawing and design tools (e.g., AutoCAD).
• Experienced in HVAC, building services, and renewable technologies (solar preferred but not essential).
• Knowledgeable about relevant standards and regulations for commercial and industrial systems.
• Skilled in client interaction, multi-disciplinary collaboration, and construction processes.

What's in it for you?

• Competitive salary: £60,000 to £70,000 per annum.
• Employee share options.
• Discretionary bonus scheme.
• 25 days of holiday plus a day off on your birthday.
• Enhanced company maternity/paternity pay.
• Paid time off for volunteering.
• Private health insurance.
• Employee Assistance Programme.
• Salary sacrifice schemes for additional benefits.
• Opportunities to work with high-profile clients and a team passionate about sustainability.

Who are we?

Executive Integrity is a global executive search and recruitment consultancy for a more sustainable world with a focus on talent within the Maritime and Renewable Energy sectors. We give a proportion of all our profits to Renewable World, a charity that develops affordable and innovative renewable energy solutions to poverty-stricken communities.