Senior Mechanical Engineer in London

Job Description

Senior Mechanical Engineer – Design‑Focused – Data Centres – Critical Infrastructure.

Join a team working on some of the UK's most technically challenging data centre and critical environment projects.

Our client is a leading M&E contractor with an annual turnover of around £90 million, delivering high‑profile commercial fit‑out, data centre refurbishment, and critical infrastructure upgrade projects across the UK.

With a strong reputation for technical excellence, an impressive order book, and a genuinely people‑focused culture, they have built a business where staff retention is exceptionally high and long‑term career development is a priority.

Due to continued growth and a significant pipeline of secured work, we are seeking a Senior Mechanical Engineer to join our expanding engineering team.

The Role

As part of a highly skilled technical team, you will take ownership of mechanical design activities from initial concept through to detailed design, commissioning and project delivery.

This role offers a unique opportunity to work on complex refurbishment and upgrade projects within live critical environments, including data centres and mission‑critical facilities.

You will play a key role in ensuring technical excellence throughout the project lifecycle while providing engineering support across the wider business.

Key Responsibilities

• Assist in the assessment of new project opportunities and preparation of submissions.
• Develop and produce all necessary mechanical calculations and design solutions from concept and briefing stage through to detailed design.
• Produce and review technical documentation, specifications, drawings and reports.
• Ensure designs comply with current regulations, industry standards and client requirements.
• Monitor and support construction activities on site, ensuring compliance with design intent and the high‑quality standards expected by the business.
• Lead and manage critical testing and commissioning activities, including:
• Integrated Systems Testing (IST)
• Black Building Testing
• Mechanical commissioning and performance validation
• Provide technical guidance and support to project teams, site teams and wider business stakeholders.
• Collaborate closely with clients, consultants, subcontractors and internal teams throughout project delivery.

About You

• Degree qualified or equivalent in Mechanical Engineering or Building Services Engineering.
• Minimum 5 years’ experience within mechanical building services design.
• Strong understanding of HVAC and mechanical systems within critical environments.
• Experience delivering projects within data centres, critical infrastructure, commercial fit‑out or similar technically demanding sectors.
• Competent in mechanical calculations and industry‑standard design software.
• Knowledge of current British Standards, Building Regulations, CIBSE guidance and industry best practices.
• Experience supporting testing and commissioning activities within mission‑critical facilities would be advantageous.
• Excellent communication and stakeholder management skills.
• Ability to work independently while contributing to a collaborative team environment.

What’s on Offer?

• Opportunity to join a highly respected and financially stable M&E contractor.
• Strong pipeline of secured projects across the data centre and critical infrastructure sectors.
• Exposure to technically challenging refurbishment and upgrade projects within live environments.
• Clear progression opportunities within a growing business.
• Supportive, culture‑driven environment with excellent staff retention.
• Competitive salary and comprehensive benefits package.

Apply today for immediate consideration.

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