Mechanical Equipment Engineer - Energy...

Job Description

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Job Description

ALTEN UK is seeking a Mechanical Equipment Engineer to join our engineering team at Harwell. In this role, you will support the detailed design, commissioning, and testing of mechanical equipment for active nuclear facilities, ensuring safety, compliance, and operational excellence.

This is a unique opportunity to work on complex, safety-critical systems, including pumps, valves, HVAC systems, pipework, and ancillary plant equipment, supporting post-operational testing and cleanout activities.

Your main responsibilities will be:

• As a Mechanical Equipment Engineer, you will take responsibility for the design, installation, and testing of mechanical plant systems, working collaboratively with multidisciplinary engineering teams. Your main responsibilities will include:
  
• Lead detailed mechanical design activities, producing high-quality drawings, calculations, and specifications.
  
• Support works testing, commissioning, and verification of installed equipment performance.
  
• Troubleshoot and resolve mechanical system issues as they arise.
  
• Interface with electrical, instrumentation, process, and civil engineering teams.
  
• Ensure compliance with nuclear regulations, safety standards, and quality assurance requirements.
  
• Support post-operational activities, including plant cleanout and preparation for maintenance or decommissioning operations.
  
• Contribute to risk assessments, method statements, and safety documentation.
  
• Mentor junior engineers and support team development.
  
  You are…
  
  
• Passionate about mechanical engineering in safety-critical applications
  
• Detail-oriented and methodical in design and verification activities
  
• Confident in communicating with multidisciplinary teams
  
• Able to manage multiple priorities and workstreams independently
  
• Committed to maintaining compliance and safety standards
  
  Qualifications
  
  Qualifications
  
  Experience, skills and qualifications required:
  
  
• Degree in Mechanical Engineering or equivalent professional qualification
  
• 5+ years’ experience in detailed mechanical design, ideally in nuclear, defence, or other regulated safety-critical industries
  
• Hands-on experience with mechanical plant equipment, including pumps, valves, HVAC systems, pipework, and ancillary plant
  
• Familiarity with works testing, commissioning, and post-operational cleanout procedures
  
• Strong understanding of mechanical design standards and industry regulations (e.g., ASME, BS, EN)
  
• Proficiency in CAD/design software (AutoCAD, Inventor, SolidWorks, or equivalent)
  
• Excellent communication skills and experience producing technical documentation
  
• Ability to work both independently and collaboratively in multidisciplinary teams
  
  Desirable:
  
  
• Previous experience in nuclear or regulated environments
  
• Knowledge of plant maintenance, lifecycle management, or decommissioning
  
• Experience delivering projects in hybrid working environments
  
  Additional Information
  
  Why join us?
  
  We foster a community of dually talented individuals who are both entrepreneurs and technology specialists. Our teams embody the spirit of innovation and entrepreneurship, enabling us to develop solutions most efficiently.
  
  Our commitment to sustainable growth is unwavering, and we continuously strive for accelerated transformation and continuous improvement. Through ALTEN labs, mentoring programs, internal universities, and more, we are always pushing boundaries and embracing new possibilities.
  
  We offer incredible opportunities to join inspiring projects in the most innovative companies.
  
  We prioritise your career development with personalised support plans tailored to your own aspirations. We're here to empower you and help you reach your full potential.
  
  Join our passionate team and start building tomorrow, today!
  
  In short you get:
  
  
• A personalised career path and a rewarding management style
  
• A chance to work on the most exciting engineering projects and technologies along with Premium Customers
  
• A huge diversity of engineering projects and industries
  
• A competitive salary
  
• Private Medical & Travel Insurance
  
• Pension Scheme
  
• Cycle-to-work Scheme among many additional benefits
  
• Social atmosphere, regular gatherings, and team buildings
  
  Flexible way of working (role dependent)
  
  This role will require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . Details of this will be discussed with you at interview.