via indeed · 5 June 2026 ·1 day ago

Senior Mechanical Engineer

Mechanical Engineering Jobs
London
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Senior Mechanical Engineer – Design–Focused – Data Centres – Critical Infrastructure

Are you a design–focused Senior Mechanical Engineer looking to work 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 circa 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, they are seeking a Senior Mechanical Engineer to join their expanding engineering team.

The Role

Working 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 fee 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.
If you are a technically strong Mechanical Engineer looking to take the next step in your career with a business that genuinely invests in its people and delivers some of the UK's most exciting critical infrastructure projects, we would love to hear from you.

Apply today for immediate consideration.

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