⚡️💡 About Assystem
At Assystem, our mission is to accelerate the energy transition worldwide. Our 8,000 Switchers combine long-standing engineering expertise with project delivery and digital capability to support complex, safety-critical infrastructure. In the UK, we are embedded in landmark programmes including Hinkley Point C, Sizewell C and future Small Modular Reactor developments. We support projects from construction through commissioning and into operation, helping deliver safe, low-carbon energy for generations.
🤝 Why Join the Community of Switchers?
You will be joining one of the three largest nuclear engineering companies in the world, trusted on the most demanding regulated programmes globally. Assystem offers long-term project stability, exposure to full lifecycle delivery, and the opportunity to deepen your commissioning expertise within a strong technical community. Your future team works collaboratively, sharing knowledge and maintaining the highest standards of safety and quality.
🚀 The Job Role
This is a full time role with site presence required, considering candidates within commuting distance or open to supported relocation. The role operates at the construction to commissioning interface on a major nuclear project. You will deliver hands-on commissioning of safety-classified instrumentation and control systems through to handover.
🔧 Support construction and installation readiness for safety-classified I&C systems
📐 Review P&IDs, loop diagrams, datasheets, wiring and system documentation
🔍 Verify as-built instrumentation, cabling, tubing and impulse lines against approved design
🧪 Carry out and support inspection, calibration and loop readiness activities
📋 Identify defects, incomplete works and deviations under configuration control
⚙️ Execute loop checks, point-to-point testing and functional testing activities
🧠 Interface with DCS, PLC and protection systems validating alarms and safety functions
🛠️ Support commissioning of pneumatic, hydraulic and motor-operated final elements
📈 Track commissioning progress and report system status to the Commissioning Manager
Required Skills and Qualifications
🎓 Degree or HNC or HND in Instrumentation, Control or related discipline
📏 Strong knowledge of process instrumentation and measurement principles
🧪 Hands-on experience calibrating industrial or safety-related instrumentation
🔌 Experience interfacing field instrumentation with DCS or PLC systems
🛠️ Experience supporting commissioning of control valves and final elements
📐 Understanding of calibration tolerances, acceptance criteria and traceability
📋 Familiarity with commissioning work control, permits and quality processes
🏭 Experience in nuclear, power generation, oil & gas or heavy industrial environments
🌟 Why Apply?
This role offers hands-on involvement in commissioning safety-critical I&C systems on one of the UK’s most significant nuclear programmes. You will build deep commissioning capability, work alongside experienced specialists, and strengthen your long-term career within a global engineering organisation delivering nationally important infrastructure.
Benefits include:
🏡 Hybrid Working Opportunity
🕒 Flexible working hours
🛡️ Market Leading 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.
Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition. We see ourselves as an activist in the development of nuclear energy, convinced that it is an essential part of the fight against climate change.
8,000 switchers, spread in 13 countries in Europe, Asia, Africa and the Middle East are working every day to make the energy switch by accelerating the development of nuclear and renewable energies, power grids, clean hydrogen projects and low-carbon transport.
We design and supervise major projects through our engineering activities and accelerate our customers' digital transformation. We also develop new solutions to build faster and improve the performance of complex infrastructures.
59 years of experience have made Assystem a key partner of the world's largest industrial groups: CEA, EDF, ENEC, Enedis, Engie, Framatome, ITER, K.A. CARE, Naval Group, NICDC, Orano, RATP, Rolls Royce, Royal Commission, Sellafield, SNCF...
Assystem is ranked in the Top 3 companies in the nuclear energy sector.
