Mechanical Process Engineer

Company Description



⚡️ About Assystem



Assystem is committed to accelerating the global energy transition. With over 7,500 Switchers across the globe, we combine deep-rooted engineering expertise with digital innovation to help build a sustainable energy future. In the UK, we play a vital role in landmark projects such as Hinkley Point C, Sizewell C, and the development of SMRs, supporting the safe and efficient delivery of nuclear power infrastructure.



Why Join the Community of Switchers?



You’ll be joining one of the top three nuclear engineering companies in the world. Our mission-led approach places you at the heart of the energy transition. At Assystem, you’ll collaborate with industry leaders, contribute to world-class nuclear projects, and gain exposure to some of the most ambitious engineering programmes on the planet.



Job Description



The Job Mission



This role supports the Commissioning & Operations team on one of the UK’s most complex nuclear builds. You’ll help shape and maintain commissioning process frameworks for contractors on site. The role suits someone with mechanical understanding, process-thinking, and attention to detail.



Develop and maintain end-to-end processes from design through to handover

Ensure process compatibility with existing commissioning procedures and industry regulations

Create and update process flow diagrams and supporting technical documentation

Collaborate with internal and external stakeholders to resolve process issues

Champion best practices and continuous improvement in commissioning activities

Support internal reviews, workshops, and stakeholder discussions

Use tools such as MS Visio, Excel, and Word to document clear process steps

Work with engineering teams to align process expectations across disciplines 



Qualifications



Essential Skills and Qualifications



Mechanical Engineering background

Ability to create and interpret process flow diagrams and system schematics

Experience developing or improving technical processes or procedures

Strong MS Office skills, particularly Visio and Excel

Good analytical and structured problem-solving ability✔️ Desired Skills



Experience in highly regulated environments

Familiarity with project risk and quality control principles

Understanding of CDM or Health & Safety frameworks

Basic commercial or contractual awareness

Knowledge of engineering assurance and compliance practices 



Additional Information



Ready to shape the future? Join your future team on-site at one of the most ambitious nuclear power projects in Europe. Be part of a collaborative mission to uphold the highest construction and quality standards.



Benefits include:

Hybrid Working Opportunity

Flexible working hours

️ Pension scheme (8% company / 4% personal)

️ 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 & 3× 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 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