Mechanical Design Engineer jobs in United Kingdom

Location: Plymouth, Devon + Hybrid Working Arrangements

Compensation: £51,941 + Benefits

Role Type: Full time / Permanent

Role ID: SF70560

At Babcock we’re working to create a safe and secure world, together, and if you join us, you can play your part as a Senior Mechanical Engineer - Building Services or Devonport Royal Dockyard site.

As a Senior Mechanical Engineer - Building Services, you’ll have a role that’s out of the ordinary. It’s purposeful work in defence, aerospace and engineering where your expertise helps protect people and capability, while accelerating your development on high‑profile programmes such as the 10 Dock improvements at Devonport.

Day-to-day, you’ll lead mechanical building services design across complex dock and facility projects—from requirements capture and concept, through detailed design, implementation and close‑out, to through‑life support and decommissioning. You’ll deliver designs and substantiation that meet licence conditions, legislation and codes, ensuring our infrastructure remains safe, reliable and mission‑ready.

• Lead mechanical building services design (heating, ventilation and air conditioning, steam and condensate, industrial gases, domestic and demineralised water) and produce calculations, specifications and technical notes.
• Guide optioneering and design reviews (including HAZOPs), providing technical advice as a subject matter expert and maintaining design intent across Babcock‑owned systems.
• Manage workloads, supervise engineers, and ensure quality, configuration control and compliance with relevant standards and legislation.
• Coordinate with CAD teams to develop models/drawings, conduct site surveys and monitor works, representing Mechanical Services Technical Authority.
• Support project delivery—estimating, tender responses and technical analysis—while reporting progress and changes of scope.

This role is full time, 35 hours per week and provides hybrid working arrangements.

• Experience in design consultancy or contractor design environments, including leading small teams of engineers.
• Strong computer literacy with industry‑standard digital tools (e.g., Hevacomp) and the mechanical services design lifecycle.
• Deep understanding of mechanical engineering principles for building services systems (steam and condensate, HVAC, gases, water services).
• Detailed knowledge of applicable regulations, legislation and technical standards.
• Proven quality assurance, documentation and stakeholder coordination across complex facilities.

• Degree (or equivalent) in Building Services Engineering, Mechanical Engineering or related subject; or NVQ Level 5 in an engineering discipline.

The successful candidate must be able to achieve and maintain Security Check (SC) security clearance for this role.

Many of the positions within our company are subject to national security clearance and Trade Control restrictions. This means that your eligibility for certain roles may be affected by your place of birth, nationality, current or former citizenship, and any residency you hold or have held. Further details are available at United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk).

• Generous holiday allowance
• Matched contribution pension scheme, with life assurance
• Access to a Digital GP, annual health check, and nutritional consultations through Aviva DigiCare+
• Employee share scheme
• Employee shopping savings portal
• Payment of Professional Fees
• Reservists in the armed forces receive 10-days special paid leave
• Holiday Trading is a benefit that allows UK Babcock employees to buy additional leave or to sell up to one working week of annual leave from their annual entitlement. This Window opens February through to March annually.
• ‘Be Kind Day’ enables employees to take one working day's paid leave a year (or equivalent hours) to undertake volunteering work with their chosen organisation or registered charity
• Excellent development opportunities and benefits package including an employee assistance programme supporting physical, mental and financial wellbeing.

For over a century Babcock has helped to defend nations, protect communities and build a better world. To continue, we must adapt, advance and be a sustainable business with a shared goal.

We are a disability confident committed employer. If you have a disability or need any reasonable adjustments during the application and selection stages, please email careers@babcockinternational.com with the subject header ‘Reasonable adjustments requirement’. We’re committed to building an inclusive culture where everyone’s free to thrive. We are happy to talk about flexible working – please ask about alternative patterns of work at interview.

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