Overview
Job Title: Principal Mechanical Engineer
Location: City, County + Hybrid Working Arrangements
Compensation: £57,300 – £71,600 Depending on experience + Benefits
Role Type: Full time / Permanent
Role ID: SF74422
Employer: Babcock (Devonport Royal Dockyard)
Role
As a Principal Mechanical Engineer, you’ll provide expert technical leadership across the full engineering lifecycle, from concept and design development through to implementation, operation, decommissioning and disposal. You’ll help ensure compliance with regulatory requirements, engineering standards and safety obligations while delivering high-quality solutions that support national defence and critical infrastructure.
Day-to-day, you’ll be required to:
Responsibilities
- Lead and support mechanical engineering design activities throughout the full project lifecycle.
- Specify technical requirements, produce engineering guidance and support tender and commercial activities.
- Provide technical oversight of mechanical services designs, ensuring compliance with regulatory and industry standards.
- Conduct design reviews, validation activities, technical audits, site inspections and stakeholder meetings.
- Mentor junior engineers while providing expert advice to stakeholders across the business.
This role is full time, 35 hours per week and is predominantly office-based but will require site visits across Devonport. Hybrid working arrangements are available, with a minimum of two days per week on site and additional presence as required to support business needs.
Essential Experience
- Extensive knowledge of mechanical engineering systems including steam and condensate, industrial gases, fresh water, demineralised water and domestic water services.
- Experience applying the full engineering design lifecycle across complex projects.
- Strong understanding of relevant regulations, legislation, codes and standards governing mechanical systems design.
- Experience working within nuclear, defence or other highly regulated, high-hazard industries.
- Experience supporting commissioning, performance evaluation and engagement with clients and key stakeholders.
Qualifications
- Level 6 qualification in Mechanical Engineering or a closely related discipline, or a Level 5 qualification with substantial relevant experience.
- Chartered Engineer status or actively working towards Chartered Engineer accreditation.
Security Clearance
The successful candidate must be a sole UK national who is able to achieve and maintain Security Check (SC) security clearance for this role. Many positions within our company are subject to national security clearance and Trade Control restrictions. Details are available at UK GOV.UK.
What We Offer
- Generous holiday allowance
- Matched contribution pension scheme, with life assurance
- Access to a Digital GP, annual health check, and nutritional consultations
- Employee shopping savings portal
- Payment of Professional Fees
- Reservists in the armed forces receive 10 days of special paid leave
- Holiday Trading to buy additional leave or sell up to one week of leave (annual window February–March)
- Be Kind Day: one paid leave day per year for volunteering
About Babcock
We’re Babcock — a global FTSE 100 organisation with over 26,000 people working together to make a difference. We’re committed to building an inclusive culture and offering flexible working where possible. If you have a disability or require reasonable adjustments during the application process, please email careers@babcockinternational.com with the subject header “Reasonable adjustments requirement.”
Closing date: 20/07/2026
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