Job Description

Company Description

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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.

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

Qualifications

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

Additional Information

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.