EC&I Commissioning engineer

Assystem UK Ltd; Bridgwater; On-site; GBP 40,000 - 60,000; Full time

Job summary

A leading nuclear engineering firm in the UK is seeking a Commissioning Engineer to work on major nuclear projects. This full-time role requires site presence and involves hands-on commissioning of safety-classified instrumentation and control systems. Responsibilities include supporting construction readiness, reviewing documentation, and executing testing activities. Ideal candidates will have a relevant degree and strong knowledge of instrumentation principles. Benefits include flexible hours, competitive pension, and 25 days' annual leave.

Benefits

Flexible working hours

Market Leading Pension scheme

25 days' paid annual leave

Professional fees reimbursed

Employee referral scheme

Competitive Sick Pay

Income Protection & 3x Salary Death-in-Service Cover

Free Digital Gym Access

24/7 Employee Support Line

Qualifications

• Strong knowledge of safety-classified instrumentation and control systems.
• Hands-on experience in calibration and commissioning activities.
• Experience in nuclear, power generation, oil & gas or heavy industrial sectors.

Responsibilities

• Support construction and installation readiness for I&C systems.
• Review system documentation and verify instrumentation against design.
• Execute loop checks and functional testing activities.

Skills

Process instrumentation knowledge

Calibration of industrial instrumentation

Commissioning control valves

Understanding of calibration tolerances

Experience with DCS/PLC systems

Education

Degree or HNC or HND in Instrumentation or Control

Job description

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.

Responsibilities

• 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

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

About Assystem

At Assystem, our mission is to accelerate the energy transition worldwide. Our 7,500 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.

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.