Senior HVAC Site Engineer

OverviewAssystem 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.

The Job RoleThis 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.

Responsibilities

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

Qualifications

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

Additional InformationReady 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

25 days’ paid annual leave + bank holidays + option to buy or sell days

Competitive Sick Pay – Support when you need it

Free Digital Gym Access – Expert-led fitness classes

24/7 Employee Support Line – Mental health, financial and 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 ..... full job details .....