Senior Process Engineer

Assystem UK Ltd; Bagstone; Hybrid; GBP 60,000 - 90,000; Full time

Benefits offered by this job

Holiday bonuses

Hybrid work 3 days remote

Job summary

Assystem UK Ltd is seeking a Senior Process Engineer to support the design of complex thermal and fluid systems for the SMR project in the UK. You will generate analyses and calculations for Turbine Island designs and contribute to an internal centre of excellence for analysis methodology.

The role involves coordinating with suppliers, reviewing PFDs and P&IDs, and ensuring safety and regulatory compliance across FEED to EPC delivery in a regulated nuclear environment. Hybrid work available.

Qualifications

• Experience in nuclear or regulated industries such as thermal power.
• Technical knowledge of steam turbines, condensers, feedwater heaters, pumps and piping.
• Experience from FEED to detailed design and EPC delivery.
• Procurement specs development and supplier liaison experience.
• Strong communication with internal and external stakeholders.
• Familiarity with UK HSE regulations, safety systems and HAZOP.

Responsibilities

• Ensure supplier deliverables meet requirements and challenge designs.
• Create and review PFDs, P&ID, layout drawings and sizing calculations.
• Develop and review functional and design requirements.
• Integrate Turbine Island design into the power plant.
• Serve as the go-to expert for Turbine Island interfaces.
• Support design reviews, HAZID/HAZOP, and safety compliance.
• Collaborate with safety teams on licensing and permitting.

Skills

Nuclear sector experience

Steam turbines knowledge

Piping systems knowledge

Procurement liaison

Stakeholder communication

Job description

Senior Process Engineer

Date: 2026-10-18

Location: Gloucestershire, Gloucestershire, GB, BS37 7NE

Work Type: Any

Company: Assystem

Application Deadline: 2026-11-17T10:00:15.69

Company Description

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description

Join the Fusion and Modular Nuclear Business Unit! The Process Engineer will support the design of complex thermal and fluid systems for the SMR project. This exciting new build project embraces innovation to deliver a commercial product. The role will provide analysis and calculation support across Turbine Island systems and will contribute to an internal centre of excellence for analysis and calculation methodology. Along with the cross-cutting lead, you will generate static and transient flow and thermal analyses using various software tools and methods to demonstrate the system performance.

Your mission:

• Intelligent Customer: Ensure supplier deliverables meet requirements, challenging designs where necessary.
• Design Development: Create and review Process Flow Diagrams, Piping & Instrumentation Diagrams, Layout Drawings, Component Sizing Calculations, and decision-making processes.
• Systems Engineering: Develop and review functional and design requirements.
• Integration: Seamlessly integrate Turbine Island design into the broader power plant.
• Technical Support: Serve as the go-to expert for Turbine Island interface and stakeholder activities.
• Safety & Compliance: Support Design Reviews, HAZID/HAZOP studies, and ensure adherence to H&S Policies.
• Liaison: Work with safety teams on nuclear safety licensing and environmental permitting.

Why Join the Community of Switchers?

• 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: 3 days remote per week.

Qualifications

• Experience: Background in the nuclear sector or regulated industries like thermal power generation, oil and gas.
• Technical Expertise: Knowledge of steam turbines, condensers, feedwater heaters, pumps, and piping systems.
• Project Delivery: Experience from FEED to detailed design and EPC delivery.
• Procurement & Supplier Liaison: Skilled in developing procurement specs and working with suppliers.
• Communication: Excellent skills for interacting with internal and external stakeholders.
• Safety Knowledge: Familiarity with UK Health and Safety regulations, safety systems, and HAZOP.
• Codes & Standards: Understanding of ASME, European, and UK standards.
• Systems Engineering: Experience or awareness desirable.

Additional Information

• Security: BPSS and SC required.
• Travel Ready: Ability to travel to Assystem offices and customer sites within the UK.
• Global Impact: Support major UK and international Nuclear Clients with key work packages.

Ready to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation!

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.

Summary

• Type: Full-time
• Function: Engineering
• Experience level: Mid-Senior Level
• Industry: Management Consulting