Senior Mechanical Engineer - HVAC

️ 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 Mission
This role supports the mechanical engineering delivery on one of the UK’s most ambitious nuclear programmes. You’ll ensure construction readiness, lead technical coordination, and drive engineering compliance.

This is a hybrid role, with 3 days on-site at Hinkley Point C in Bridgwater. You’ll need to be within commutable distance—or be open to relocating, with financial support available to help with the move.

Key responsibilities include:

• Lead and mentor a team delivering mechanical construction work scopes
• Define activity boundaries with subject matter experts and client teams
• Own and update workpack documentation in line with project requirements
• Drive timely delivery of documentation to support safe construction
• Promote a proactive approach to health, safety, and environmental excellence
• Ensure engineering works comply with nuclear site licence conditions
• Coordinate site surveys and access routing for construction start-up
• Support work authorisation and permitting systems across the project

My profile

Essential Skills and Qualifications

• Minimum HNC/HND in Mechanical Engineering
• Recognised accreditation in project, construction, or engineering disciplines
• Experience delivering projects in regulated sectors
• Strong team leadership across disciplines and functions
• Working knowledge of mechanical documentation and control systems
• Familiarity with work authorisation and permit systems
• Experience preparing mechanical workpacks on major infrastructure sites
• Insight into Hinkley Point C or similar nuclear build projects
• Background in site survey coordination and planning access routes
• Strong problem-solving approach and flexibility on evolving projects

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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