Design jobs in United Kingdom

Assystem is a global leader committed to accelerating the energy transition. With 7,850 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.

🚀Join the Fusion and Modular Nuclear Business Unit!🚀Assystem has an exciting opportunity for a ElectricalEngineer to join our expanding Fusion and Modular Nuclear (FMN) business unit. As leaders in the design and development of new technologies, you will have the opportunity to work across multiple cutting-edge projectsdeveloping technical solutions making net-zero power generation a reality.

Providing engineering expertise in the design, analysis and verification of electrical systems used across nuclear facilities. The role supports new build, operational plant upgrades and decommissioning projects. The engineer ensures electrical designs are safe, compliant and integrated effectively with control, protection and mechanical systems throughout the lifecycle.

• 🔌 Develop Electrical System Designs: Design electrical systems, including single-line diagrams, load schedules, cable routing, earthing and bonding arrangements, and equipment specifications.
• 📑 Produce Design Documentation: Create essential design documents such as electrical calculations, protection schemes, coordination studies, panel designs, and installation drawings.
• ⚖️ Apply Nuclear Safety Requirements: Interpret and apply nuclear safety requirements, ensuring electrical systems support reliability, maintainability, and defense in depth.
• ⚡ Undertake Power System Studies: Conduct power system studies including load flow, fault level analysis, discrimination, and arc flash assessments when required.
• 🔧 Select Electrical Equipment: Choose appropriate electrical equipment like LV/MV switchgear, transformers, UPS systems, motors, drives, and distribution components suited for nuclear environments.
• 📏 Ensure Design Compliance: Ensure designs comply with relevant standards such as BS EN 61508, BS 7671, IEC 60364, and nuclear site-specific requirements.
• 🤝 Collaborate Across Teams: Work closely with EC&I, control systems, mechanical, civil, and safety engineers to ensure seamless integration across interfaces.
• 🔧 Support Control Systems: Support the electrical aspects of instrumentation and control systems, including power supplies, segregation, EMC considerations, and environmental qualification.
• 🔍 Engage in Design Reviews: Participate in design reviews, HAZOPs, failure mode assessments, and engineering substantiation activities to optimize safety and performance.
• ⚙️ Provide Support During Manufacturing & Commissioning: Support manufacturing, FAT, SAT, and commissioning phases, resolving electrical design issues and ensuring traceability to requirements.

• 🌟 Over 55 years in nuclear engineering.
• 🏆 Ranked among the top 3 largest nuclear engineering companies.
• 💼 Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• 📚 Ongoing training with numerous career opportunities.
• 📈 70% of our managers are promoted internally!
• 🏠 Hybrid work: 1-2 days remote per week.

• ⚡ Proven electrical engineering experience in regulated, safety-critical sectors—bringing hands-on expertise from industries like nuclear, defence, or energy.
• 🔌 Strong grasp of electrical distribution systems—including protection principles and best-practice installation methods.
• 📐 Skilled in creating core electrical deliverables such as SLDs, cable calculations, equipment specs, and protection settings.
• 🏗️ Familiar with nuclear design expectations—from safety classifications and redundancy to segregation and qualification requirements.
• 📚 Knowledgeable in key UK and international standards, including BS 7671, IEC/BS EN, ENA docs, and more.
• 🤝 Excellent communicator and collaborator—experienced working in multi-disciplinary project environments
• 🖥️ Able to use power system modelling tools like ETAP, Amtech, EasyPower or similar for accurate and efficient analysis.
• 🏭 Experience in nuclear new build, plant life extension, or decommissioning—bringing valuable lifecycle insights.
• 🔋 Understanding of C&I power supply design, including UPS selection and battery sizing for robust system reliability.
• ⚡ Knowledge of EMC, lightning protection, and protective earthing schemes tailored for nuclear environments.
• 🎓 Chartered Engineer status (or working toward it)—showcasing commitment to professional excellence.
• 📦 Experience reviewing vendor packages and conducting technical bid evaluations to support informed procurement decisions.

• BPSS and SC required
• Ability to travel Assystem offices and customer sites within UK.
• To undertake work packages supporting major UK and international Nuclear Clients.

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.

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.