Senior Stress Engineer

Our Vacancy# Senior Stress Engineer
* Nuclear* Permanent /
* Warrington* United Kingdom
* 22/11/25
* On site
* Share##Assystem is a global leader committed to accelerating the energy transition. With 7,750 employees across 12 countries, we tackle the monumental task of switching to low-carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top-notch engineering, project management, and digital solutions.##

Job Description
** Join the Fusion and Modular Nuclear Business Unit!
** Assystem are expanding our Stress capability and are looking for enthusiastic Stress Engineers to join us and contribute to the delivery of essential projects within the nuclear sector. In this role, you’ll apply your expertise in Finite Element Analysis (FEA) to perform detailed assessments of nuclear components, ensuring compliance with design codes such as ASME III and RCC-M. You’ll be involved in project planning, delivery, and reporting, and will communicate regularly with internal and external stakeholders, including client technical leads.

This role offers the opportunity to work both within client teams and from our Assystem offices, providing a variety of project experiences.
** Your mission:**
* ** Desire to learn**:
Working with our experienced team you will be supported in developing skills and competencies on a range of projects and customers.
* ** Technical aptitude**:
You will be responsible for planning, undertaking and reporting simulation and assessment projects using a range of tools, for example ANSYS or Abaqus FEA software, and calculations using MathCAD.
* ** Digital first:
** Familiarity with typical engineering and data management software such as document control, Product Lifecycle Management, MS Office, TEAMS etc.
* ** Collaborative**:
Working as part of a team you will be required to collaborate and communicate as part of a team, and be comfortable to work independently where appropriate.
* ** Delivery focused:
** Driven to achieve milestones and produce high quality outputs to time and cost budgets.
* ** Commercially aware:
** Understanding of the commercial context of project delivery including achieving milestones, management of requirements compliance, change and technical risk.
* ** Organised & Communicative:
** Able to organise and plan effectively, and excellent communication skills.
* ** Report writing:
** Ability to write high-quality, clear, concise and accurate technical reports.
* 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: 1-2 days remote per week.
** Essential:
** Nuclear industry experience (defence) preferable, but transferable skills from other disciplines accepted   Demonstrable expertise in fatigue, fracture, thermal, and structural stress assessments using finite element analysis Finite Element analysis in ABAQUS (explicit/implicit)   ABAQUS/CAE or equivalent  (desirable)   Code assessment to ASME B&PVC and R6; RCC-M a plus   Knowledge of structural integrity & defect tolerance assessments   Python scripting in ABAQUS environment desirable   CRACKEN or alternative fracture assessment experience Highly desirable   Fatigue crack growth & initiation experience desirable   Familiar with Gated review process
** Desirable / Preferred:
*** Previous experience in similar roles in the nuclear or fusion industry.
* Hands-on experience of 3D modelling in CAD software such as Autodesk Inventor, Catia or Solid Works.
* Experience of fluid-modelling such as CFD, or dynamic modelling such as LS-Dyna or Radioss.
** Attributes:
***
* Additional Requirements:

*** BPSS and SC required.
* Ability to travel Assystem offices and customer sites within UK.
* To undertake work packages supporting major UK and international Nuclear Clients.
** Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared…