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Our Vacancy

Senior HVAC Designer

  • Nuclear
  • Permanent /
  • Warrington
  • United Kingdom
  • 23/03/26
  • On site

Join Our Mission to Accelerate the Global Energy Transition 🌍⚡️


At Assystem, we’re on a mission to drive the global energy transition and help create a sustainable, low-carbon future for all. With over 55 years of experience in highly regulated sectors and a global team of 8,000 passionate professionals, we are making a real impact on the world’s energy landscape.


Our team is growing, and we’re looking for a Senior HVAC Designer to be a key player in our innovative, collaborative projects that are shaping the energy future.


Job Description

🌟 Senior HVAC Engineer

📍 Location: Warrington
📄 Type: Permanent / Contract

Are you a skilled HVAC Designer with a background in the nuclear industry? Do you thrive in a collaborative and dynamic environment, where your expertise helps build solutions that drive the energy transition? If so, we want YOU to join our team and help us deliver safe, efficient, and cutting-edge building service solutions!

What You’ll Be Doing:

💨 Member of the Project team responsible for delivering the HVAC design function for the Site Management Projects area.

🤝  Work alongside a small, close-knit team of designers to hit key project milestones and goals.

🗂️  Meet the targets identified in the Schedule.

📋  Ensure that design solution meet safety case requirements and are radiologically and conventionally ALARP for implementation and operation.

🛠️Site surveys of mechanical and building services drawings.

📐Production of design and detail drawings associated with the vent for Alpha ventilation systems, Checking and back draughting of drawings.

✅ Production and modification of drawings for process plant layouts, piping routes, isometrics and as built drawings, Production and modification of Engineering Flow Diagrams (EFDs) to as-built status for the project. 

💡 Production of valve schedules – creating and editing existing valve schedules for the project.

🔍 Production of Ventilation Flow Diagrams (VFDs) to as-built status for the project, Production of Single Line Diagrams (SLDs) to as-built status for the project, Maintaining project records.

📑Competent use of 3D modelling package to share design progress during technical and project meetings.

🔗 Work with integrated design teams, systems engineers, and other project functions to achieve seamless project delivery.

This role is essential for delivering high-quality HVAC solutions, and your expertise will play a pivotal role in shaping the future of energy-efficient infrastructure.

My profile

What We’re Looking For:

🎓Degree in Mechanical Engineering with a minimum of 2 years’ design delivery experience OR other qualification such as HNC and HND, with 5 or more years design delivery experience.

🤝Experience of working within a highly regulated industry, preferably within the nuclear industry.

🌟Recent experience of Nuclear Vent plant design and the decommissioning of redundant plant would be advantageous, but not essential.

📜Experience of ‘Design for Assembly’ within a nuclear facility.  

⚛️Experience in the production and development of nuclear ventilation plant layout.

⏳ Able to carryout site surveys and complete as-built information.

💻Comfortable working under time and cost constraints.

🚀The candidate will need to be able to communicate effectively with team members and the Client.

📝 Competent on 2D and 3D Autodesk CAD Products.

Additional Information:

🔒 Security Clearance: Due to the nature of the work, applicants will need to meet residency criteria for UK security clearance

Diversity & Inclusion: At Assystem, we celebrate diversity and believe that unique perspectives are key to driving innovation. We encourage applications from all backgrounds, ensuring that your skills and talent are what matter most.

Ready to make an impact? Bring your expertise, passion, and drive to Assystem and help us power the future of low-carbon energy. Apply today! 🚀🌱

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

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