Principal Mechanical Engineer

JR United Kingdom; City Of London; Hybrid; GBP 65,000 - 85,000; Full time

Job summary

A leading engineering consultancy in London seeks a Principal Mechanical Engineer to drive innovation and lead diverse projects in building services. This role offers competitive remuneration alongside a profit share, bonus, and a strong mentorship culture. The company promotes a transparent salary structure and supports wellbeing initiatives, making it an ideal environment for ambitious engineers.

Benefits

Transparent Salary Structure

Profit Share + Bonus

You Own Your IP

Inclusive & Social Culture

Wellbeing Support

Continuous Growth Mentoring

Qualifications

• Experienced Senior or Principal Mechanical Engineer.
• Ideally with experience in consultancy.
• Ambitious, self-driven, and passionate about mentoring.

Responsibilities

• Leading mechanical design across various projects.
• Managing major projects from early stage to site delivery.
• Supporting and mentoring other engineers.

Skills

Leadership

Communication

Innovation

Tools

Revit

H2X

Bluebeam

Job description

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Principal Mechanical Engineer, london (city of london)

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Client:

Human Capital Solutions UK

Location:

london (city of london), United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

3

Posted:

26.06.2025

Expiry Date:

10.08.2025

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Job Description:

Principal Mechanical Engineer – To £75k + Profit Share + Bonus + Hybrid working

This isn’t your standard MEP and Sustainability consultancy.

Founded by two Chartered Engineers who were frustrated with the corporate grind, they have scaled steadily and created something unique. A bold, inclusive and forward-thinking business that empowers engineers to innovate, own their ideas, and grow fast.

Due to growth they are now looking for a Principal Mechanical Engineer for their London studio.

Someone who can lead projects, and inspire technically, commercially, and culturally.

What You’ll Be Doing:

• Leading mechanical design across a variety of commercial office fit-outs, schools, theatres, residential, hotels, and major decarbonisation schemes.
• Managing major projects from early stage through to delivery on site (RIBA Stages 2–6).
• Supporting and mentoring engineers from Graduate to Senior level.
• Collaborating closely with their Electrical, PH and Sustainability teams to deliver considered, coordinated design solutions.
• Driving innovation, everything from developing new tools to workflow improvements, with full IP ownership and support.
• Using Revit, H2X and Bluebeam to develop and review technical content.

Who you are

• An experienced Senior or Principal Mechanical Engineer, ideally with experience in consultancy.
• Ambitious, self-driven, and passionate about mentoring others.
• Strategic in your thinking, consistent in your project delivery.
• A strong communicator who builds trust quickly.
• Eager to shape not just projects, but the company’s future.

What make them different?

• Transparent Salary Structure – no smoke and mirrors; fair and open across the team.
• Profit Share + Bonus – regular reviews in June and December.
• You Own Your IP – any tool, plugin, or product you develop? You keep it, they will back it, you benefit.
• Inclusive & Social Culture – They do proper team days out, and have a genuinely supportive vibe.
• Wellbeing Support – Monthly contribution towards an healthy activity of your choice.
• Continuous Growth – Mentoring from the two Directors, constant CPD, and exposure to cutting-edge decarbonisation and sustainability work.

This isn’t just a step up from Senior to Principal.

It’s a chance to shape the culture, direction, and legacy of a growing Building Services Consultancy.

If you want your ideas to count, your projects to challenge you, and your team to back you, this is it.