Senior HVAC Site Engineer

️ About Assystem

Assystem is a global leader in engineering, dedicated to accelerating the energy transition. In the UK, we’re powering progress on landmark projects like Hinkley Point C, Sizewell C, and next-generation Small Modular Reactors (SMRs). Our 7,500+ Switchers blend deep engineering know-how with cutting-edge digital tools to help build a low-carbon world—faster, cleaner, and smarter.

Why Join the Community of Switchers?

Becoming a Switcher means joining one of the top three nuclear engineering companies in the world. You’ll work on technically complex projects that shape the UK’s energy future while gaining opportunities to grow your expertise in a fast-paced, collaborative environment.

Job Description

The Job Role:

This is a site role based on Hinkley Point C in Bridgwater, with relocation support available if required.

As a Senior HVAC Site Engineer, you will play a pivotal role in the construction phase of a landmark energy project. Your future team will rely on your leadership to ensure HVAC systems are delivered to the highest safety and quality standards, from planning through to installation and commissioning readiness.

• Lead the delivery of HVAC construction work packages across assigned project areas
• Coordinate with contractors, supervisors, and client representatives to resolve site queries
• Oversee installation activities to ensure compliance with design and safety requirements
• Ensure construction documentation is accurate, complete, and submitted on time
• Drive planning of safe access and support surveying requirements on-site
• Monitor progress, identify risks, and escalate issues to maintain delivery schedules
• Promote and embed a positive health, safety, and environmental culture on-site
• Support the implementation of permitting and authorisation systems for construction activities

My profile

• Degree or trade qualification in HVAC or Mechanical Engineering
• Professional accreditation in construction, project management, or engineering
• CCNSG Safety Passport and IOSH or NEBOSH qualification
• Proven track record in HVAC installation and construction delivery on large projects
• Ability to lead and coordinate multidisciplinary site teams
• Strong understanding of construction documentation and site processes
• Knowledge of regulatory compliance within safety-critical industries
• Experience driving safe and efficient project delivery in complex environments
• Experience delivering HVAC systems on major energy, industrial, or infrastructure projects
• Knowledge of UK nuclear or other highly regulated project environments
• Familiarity with digital permitting and document control systems
• Surveying or access planning experience in a construction setting
• Strong problem-solving skills with adaptability in dynamic site environments
• Strong problem-solving mindset with adaptability in fast-changing environments

Ready to lead the way on one of the UK’s biggest clean energy builds?
Join a team where your skills will help power the future. Bring your mechanical expertise—and we’ll provide the platform to make your mark.

Benefits include:
Hybrid Working Opportunity
Flexible working hours
️ Pension scheme (8% company contribution / 4% personal contribution)
️ 25 days’ paid annual leave + bank holidays + option to buy or sell days
Professional fees reimbursed
Employee referral scheme
Competitive Sick Pay – Support when you need it
Income Protection & 3x Salary Death-in-Service Cover
Free Digital Gym Access – Expert-led fitness classes
24/7 Employee Support Line – Mental health, financial & legal help

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.

Are you a prospective or recent graduate?

Assystem offers you the opportunity to join our Switch to Grow UK Graduate Scheme, where you’ll gain hands on experience in engineering, digital services, and project management by working on some of the world’s most critical energy projects.

Be part of the challenge of the century; accelerating the switch to low carbon energy!

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