Principal Mechanical Engineer

Position:
Principal Mechanical Engineer

Location:

Warrington or Abingdon (flexible with location)

Start Date:

ASAP

Hours:

37 hours per week, Monday - Friday

Hybrid: 3 days in the office and 2 days home working

The Mechanical Engineer will work within multidisciplinary engineering teams delivering projects across different lifecycle stages, from FEED through to detailed design, commissioning, and operational support within regulated nuclear environments. You will be involved in mechanical design and technical studies, supporting a range of systems including handling equipment, mechanical transfer systems, and process equipment used in high‑active or controlled environments. Work will also include design development, technical documentation, and support across construction, commissioning, operations, and decommissioning phases.

• Deliver and manage mechanical engineering studies and design work
• Produce and review technical outputs such as calculations, specifications, flow diagrams, P&IDs, layouts, and substantiation notes
• Support design development from concept through to detailed design and commissioning
• Contribute to mechanical handling and process system design (including powder and transfer systems in controlled environments)
• Review supplier documentation and technical submissions
• Liaise with internal teams and technical specialists across disciplines
• Support engineering input across operations, maintenance, and decommissioning activities

• Degree in Mechanical Engineering or related discipline
• 8+ years' experience as a Mechanical Engineer
• Experience delivering mechanical design within nuclear or other highly regulated environments
• Strong understanding of design lifecycle (FEED, detailed design, specification, and delivery)
• Experience with mechanical handling or process systems desirable
• Experience working on Sellafield or Magnox projects beneficial
• Membership of a professional engineering body desirable

• Strong communication skills and ability to work with internal and external stakeholders
• Ability to manage workload and meet deadlines independently
• Interest in supporting and mentoring junior engineers
• Must be eligible to work in the UK and willing to undergo security clearance

We celebrate and support diversity and are committed to ensuring equal opportunities for both employees and applicants.