Principal Mechanical Design Engineer - Data Centres
Location: South London
About the Role
We are looking for an experienced Principal Mechanical Design Engineer to lead the design and delivery of large-scale, mission-critical data centre projects. This is a senior leadership opportunity for someone with strong technical expertise in cooling systems, resilience design, and high-performance building services within critical environments.
You will play a key role in developing innovative, efficient, and resilient mechanical systems for hyperscale and colocation data centres, working closely with multidisciplinary teams and high-profile clients.
Key Responsibilities
* Lead the mechanical design of major data centre projects from concept through to delivery
* Design and oversee cooling strategies including chilled water systems, CRAH/CRAC units, direct/indirect air cooling, and liquid cooling solutions
* Develop resilient systems aligned with Tier classifications (N+1, 2N, etc.)
* Provide technical leadership across engineering teams and mentor junior engineers
* Work closely with electrical, structural, and architectural teams to ensure integrated design solutions
* Engage directly with clients, contractors, and stakeholders
* Lead design reviews, ensure compliance with industry standards, and drive best practice
* Champion sustainability, energy efficiency, and low PUE design strategies
Key Requirements
* Degree qualified in Mechanical Engineering or Building Services Engineering
* Chartered Engineer (CEng) or working towards chartership
* Significant experience delivering data centre or mission-critical projects
* Strong knowledge of:
o Chilled water systems and plant design
o Airflow management and thermal modelling
o Cooling technologies for high-density environments
o Mechanical resilience strategies for critical infrastructure
* Familiarity with industry tools (e.g., IES, Hevacomp, Revit, CFD modelling tools)
* Excellent leadership, communication, and client-facing skills
Desirable Experience
* Experience working on hyperscale or colocation data centres
* Exposure to liquid cooling or emerging cooling technologies
* International project experience
* Knowledge of sustainability frameworks and carbon reduction strategies
What's on Offer
* Opportunity to lead cutting-edge data centre projects at scale
* A collaborative, innovative engineering environment
* Clear progression to Associate / Director level
* Competitive salary and benefits package
* Flexible and hybrid working
Apply Now
If you are a driven mechanical engineer with a passion for delivering high-performance critical infrastructure, we'd love to hear from you.
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