Senior Building Services Engineer (Mechanical)
Company: ASSYSTEM
Role summary
Senior Building Services Engineer (Mechanical) is a role at ASSYSTEM in Bristol, England, United Kingdom (hybrid). Posted 2026-10-15. Experience level: 5-10.
- Job title
- Senior Building Services Engineer (Mechanical)
- Company
- ASSYSTEM
- Location
- Bristol, England, United Kingdom
- Work arrangement
- hybrid
- Category
- Trades & Construction
- Experience level
- 5-10
- Date posted
- 2026-10-15
This is a fantastic opportunity to join a leading global engineering company focused on accelerating the energy transition. If you're an experienced Mechanical Building Services Engineer looking to make a real impact in the nuclear sector, this full-time role offers significant professional growth and the chance to work with cutting-edge digital technologies.
Job description
Company Description
⚡️💡 About Assystem
At Assystem, our mission is to accelerate the energy transition worldwide. Our 8,000 Switchers blend historical engineering expertise with cutting-edge digital technologies to drive this change. Join us in revolutionizing the energy sector and making a significant global impact.
🤝 Why Join the Community of Switchers?
Be part of one of the top three largest nuclear engineering companies globally. At Assystem, you'll contribute to groundbreaking projects that push the boundaries of innovation and engineering excellence. Join a community committed to driving forward the future of energy.
Job Description
Business Unit Overview:
The Nuclear New Build (NNB) project team is leading an ambitious programme to build 2 European Pressurised Water Reactors (EPRs) at Hinkley Point in Somerset.
As a Mechanical Building Services Engineer, you will be integrated in the Ancillary Works Team, which is responsible for managing the design of all permanent ancillary buildings and you will oversee the MEP designs by both external consultants and contractors to ensure they meet NNB’s requirements.
The buildings are in varying states of maturity; ranging from concept to in construction. The main focus will be buildings whicha are part way thorugh MEP installation, and four of which are in advanced stages of design.
This team is also responsible for delivering the full design of these buildings, including the civil and structural design, mechanical systems and electrical services within these buildings, together with coordinating other systems which may be present. The team is composed of building lead/technical specialists, specialized in technical core discipline such as architectural, civil/structure, nuclear safety, mechanical and electrical design.
Key Responsibilities will be:
Supporting the specification for new buildings:
Supporting the preparation technical specifications for the consultants and contractors developing the design of the building.
Contributing to the bidders’ technical assessment.
Liaising with stakeholders involved in the specification, procurement, design, construction, use, maintenance and decommissioning of the building services.
Supporting the design of Building Services:
Surveillance of subcontracted design activities with the support of external consultants when required.
Supporting design reviews as part of the staged delivery.
Analysing and resolve any technical design issues presented by consultants and contractors, challenge their proposals.
Supporting the management of technical interfaces with the team.
Supporting the management of design changes and non-conformances occurring during the design.
Supporting construction, installation and commissioning of building services:
Supporting the assessment of changes proposed during construction
Engage with NNB Commissioning Teams and understanding NNB requirements to ensure commissioning proposals from the Contractor are suitable
General requirements:
Applying QA processes, procedures and tools to manage the design activities (NNB arrangements, interface specifications with the Responsible Designer)
Raising alerts to the building leads/building services lead where necessary.
Providing expert support to the project as a smart customer through effective engagement with Procurement, Design Authority, Engineering, MEH and Commissioning.
Commissiong Requirements:
Being the Point of Contact for the team for NNB Commissioning-related topics. Specifically, coordinating the Team’s responses to the NNB Commissioning sequence of work
Qualifications
Skills and Qualifications:
Mechanical or Electrical Engineering degree
Experience in project co-ordination, with experience of design management.
Experience in Nuclear Industry or other highly regulated industries.
Knowledge of building regulations
Knowledge of data centres is desirable.
Accuracy, tenacity, diplomacy, results-oriented, leadership
Acknowledged organisational skills and attention to detail
Ability to work independently and be proactive.
Excellent communication/interpersonal skills/team working essential.
Discretion, ability to maintain confidentiality when dealing with sensitive information
Fluent in English; French is desirable
Additional Information
🌟 Why Apply?
Join Assystem and become a key player in delivering critical nuclear projects that shape the future of energy. Embrace this opportunity to excel in a dynamic environment where your expertise and leadership will drive global innovation.
🌟 Your Benefits Package
🏠 Hybrid Working – Flexibility to work from home and the office
🏖️ 25 Days Annual Leave + Bank Holidays
🔄 Buy & Sell Holiday – Make your time off work for you
💰 8% Company Pension Contributions
🛡️ Income Protection & 3x Salary Death-in-Service Cover
🤒 Competitive Sick Pay – Support when you need it
🏥 Healthcare Cash Plan – Claim back on dental, optical & more
💪 Free Digital Gym Access – Expert-led fitness classes
🎁 Exclusive Discounts – Restaurants, days out & top brands
📞 24/7 Employee Support Line – Mental health, financial & legal help
🚴 Cycle to Work Scheme – Save money & go green
💉 Free Flu Jabs & Eye Test Vouchers
🧾 Paid Professional Membership Fees
❤️ Volunteer Days – Make a difference on company time
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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