Mechanical Engineer - HVAC

This role supports mechanical engineering delivery on a high-profile nuclear infrastructure programme. You'll help ensure engineering standards are met and construction activities stay on track. Your future team will guide you as you develop your expertise in a critical project environment.

• Assist in preparing and maintaining construction workpacks and documentation
• Coordinate with subject experts to define technical scopes
• Support surveys, inspections, and access planning for site works
• Ensure compliance with relevant safety and engineering standards
• Track and prioritise documentation to support ongoing construction
• Contribute to permit and work authorisation processes
• Liaise with wider teams across mechanical, electrical and HVAC systems

• Degree in mechanical engineering
• Exposure to construction or installation projects in regulated environments
• Strong communication and coordination skills
• Ability to work collaboratively across multidisciplinary teams

• CCNSG Safety Passport plus IOSH or NEBOSH certificate
• Experience with mechanical workpacks or construction readiness
• Familiarity with large infrastructure or energy projects
• Knowledge of permit systems or work authorisation procedures
• Hands‑on involvement in site surveys or field engineering tasks

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. 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.

• 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