Job Title: Senior Mechanical Engineer
Location: Harwell, Oxfordshire + Hybrid Working Arrangements
Compensation: Attractive Salary + Benefits
Role Type: Full time / Permanent
Role ID: SF
Shape the Future of Nuclear Innovation
At Cavendish Nuclear we’re working to create a safe and secure world, together, and if you join us, you can play your part as aSenior Mechanical Engineer at Harwell, near Didcot, Oxfordshire.
The role
As a Senior Mechanical Engineer, you’ll have a role that is out of the ordinary. You’ll be at the forefront of designing and delivering innovative solutions for one of the UK’s most critical nuclear decommissioning projects. Your work will directly contribute to the safe clean-out of legacy waste storage facilities, paving the way for future building decommissioning.
Day-to-day, you will
1. Lead and support plant and equipment trial activities, recommending and reviewing design updates.
2. Contribute to design reviews and ensure coordination and functionality across projects.
3. Prepare and produce drawings for basic, detail, and production design in line with ISO standards.
4. Provide technical assistance and guidance to the wider Cavendish Nuclear team.
5. Resolve technical and delivery issues, keeping project managers fully informed.
You’ll work37 hours per week, Monday to Friday, based at Harwell, Oxfordshire. Hybrid working patterns are available (three days on-site, two days remote).
Essential experience of the Senior Mechanical Engineer:
6. Practical experience in plant or laboratory trials, including writing and implementing Risk Assessments and Method Statements.
7. Detailed design for manufacture experience.
Qualifications for the Senior Mechanical Engineer:
8. Engineering degree (or equivalent) in a relevant discipline, with significant demonstrable experience.
Security Clearance
The successful candidate must be able to achieve and maintain Standard (BPSS) / Security Check (SC) security clearance for this role. Further details are available at United Kingdom Security Vetting: clearance levels - GOV.UK (
What we offer
9. Generous holiday allowance
10. Matched contribution pension scheme, with life assurance
11. Access to a Digital GP, annual health check, and nutritional consultations through Aviva DigiCare+
12. Employee share scheme
13. Employee shopping savings portal
14. Payment of Professional Fees
15. Reservists in the armed forces receive 10-days special paid leave
16. Holiday Trading is a benefit that allows UK Cavendish 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.
17. ‘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
18. Excellent development opportunities and benefits package including an employee assistance programme supporting physical, mental and financial wellbeing.
Cavendish Nuclear
As a leader within the UK nuclear industry, Cavendish Nuclear, part of