Assystem

About the Company

Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition. We see ourselves as an activist in the development of nuclear energy, convinced that it is an essential part of the fight against climate change.

7,500 switchers, spread in 12 countries in Europe, Asia, Africa and the Middle East are working every day to make the energy switch by accelerating the development of nuclear and renewable energies, power grids, clean hydrogen projects and low-carbon transport.

We design and supervise major projects through our engineering activities and accelerate our customers' digital transformation. We also develop new solutions to build faster and improve the performance of complex infrastructures.

55 years of experience have made Assystem a key partner of the world's largest industrial groups: CEA, EDF, ENEC, Enedis, Engie, Framatome, ITER, K.A. CARE, Naval Group, NICDC, Orano, RATP, Rolls Royce, Royal Commission, Sellafield, SGP, SNCF...

Assystem is ranked in the Top 3 companies in the nuclear energy sector.

Listed Jobs

Company Name

Assystem

Job Title

Ingénieur développement software IA - Stage H/F

Job Description

**Job Title** AI Software Development Engineer Intern (H/F) **Role Summary** Develop and integrate AI‑driven applications for nuclear site calculators. Produce requirements documents, design software in Python, work with databases and LLM/NLP technologies, deploy solutions onto existing platforms, and conduct validation and qualification testing under guidance of the development team. **Expectations** - Deliver well‑documented specifications, designs, and user manuals. - Collaborate closely with the development team and maintain clear, concise communication. - Follow established processes (Mantis, SVN, DevOps) and adhere to quality and safety standards. - Provide regular technical updates to the supervising engineer. **Key Responsibilities** 1. Draft specification documents, design documents, and technical manuals. 2. Develop Python applications, interface with SQL databases, and implement LLM or NLP components. 3. Deploy and integrate solutions into the company’s industrial platforms. 4. Design and execute validation and qualification test cases. 5. Maintain version control using SVN and track tasks via Mantis. 6. Participate in daily technical meetings and receive ongoing mentorship from senior developers. **Required Skills** - Proficiency in Python programming. - Experience with SQL and relational databases. - Familiarity with LLM/NLP techniques or frameworks. - Basic knowledge of DevOps practices (CI/CD pipelines). - Version‑control competency (SVN, Git). - Strong written and verbal communication. - Excellent documentation and teamwork abilities. **Required Education & Certifications** - Engineering or Master’s degree (or equivalent) in Computer Science, Software Engineering, Electrical Engineering, or related field. - Relevant certifications (e.g., Python, SQL, DevOps) are a plus but not mandatory.

Montigny-le-bretonneux, France

On site

18-12-2025

Company Name

Assystem

Job Title

Technicien Méthodes Mécanique H/F

Job Description

**Job Title:** Mechanical Methods Technician **Role Summary** Contribute to nuclear energy projects by developing and maintaining maintenance methods to ensure safety, quality, and operational efficiency. **Expectations** - Minimum 2 years' experience in mechanical maintenance, preferably in nuclear environments. - Strong technical expertise in method development and compliance with regulatory standards. **Key Responsibilities** - Analyze technical specifications and action plans to design intervention methods and associated documentation. - Develop and update maintenance procedures, work instructions, and risk assessments for nuclear site operations. - Implement GMAO (EAM/ECM) systems to manage maintenance documents and regulatory requirements. - Integrate field feedback (REX) and national program modifications into maintenance frameworks. - Collaborate with engineers and subject matter experts to ensure procedural accuracy and compliance. **Required Skills** - Technical proficiency in mechanical systems and maintenance process optimization. - Mastery of GMAO software (EAM/ECM) for maintenance management. - Strong analytical skills for problem-solving in complex regulatory environments. - Attention to detail and organizational abilities for documentation accuracy. - Effective communication and teamwork for cross-functional coordination. **Required Education & Certifications** - Bachelor’s degree in mechanical engineering or equivalent technical qualification (Bac to Bac+3). - Relevant industry certifications in maintenance methodologies or nuclear safety (preferred, but not mandatory with sufficient experience).

Saint-valery-en-caux, France

On site

Junior

06-01-2026

Company Name

Assystem

Job Title

Développeur front-end H/F

Job Description

**Job Title:** Front‑End Developer (m/f) **Role Summary:** Design, develop, and maintain modern web front‑end applications for a high‑impact industrial project in the low‑carbon energy sector. Build a front‑end stack from scratch, ensure code quality and architectural consistency, and collaborate with back‑end, UX/UI, and product teams in an Agile (Scrum) environment. **Expectations:** - Deliver clean, robust, and maintainable TypeScript/JavaScript code. - Follow best‑practice architectural patterns and coding standards. - Contribute to continuous improvement, technical documentation, and technology scouting. - Work proactively to resolve issues and support production‑level applications. **Key Responsibilities:** - Architect and bootstrap a new front‑end stack (TypeScript + Angular or equivalent). - Implement feature development and UI components according to specifications. - Ensure code readability, test coverage (unit tests), and maintainability. - Perform code reviews and participate in process improvement initiatives. - Maintain and evolve existing applications (bug fixes, enhancements). - Collaborate with back‑end, UX/UI designers, and product owners/managers. - Produce clear design documentation and data‑model schematics. - Stay updated on emerging front‑end technologies and propose enhancements. **Required Skills:** - Proficient in JavaScript and TypeScript; ability to write clean, testable code. - Strong experience with a modern front‑end framework (Angular, React, or Vue.js) and its ecosystem. - Solid understanding of front‑end architecture principles and best practices. - Familiarity with relational databases (PostgreSQL, Aurora) and data modeling. - Experience with NoSQL databases, especially DynamoDB. - Comfortable working in Agile/Scrum environments. - Good technical writing skills for design documentation. - Strong analytical and problem‑solving abilities. - Knowledge of cloud platforms (AWS) is a plus. **Required Education & Certifications:** - Bachelor’s degree in Computer Science, Software Engineering, or a related field (or equivalent professional experience). - Relevant certifications (e.g., AWS Certified Developer, Scrum Master) are advantageous but not mandatory.

Lyon, France

On site

15-01-2026

Company Name

Assystem

Job Title

Ingénieur Surêté H/F

Job Description

**Job title**: Nuclear Safety Engineer (Male/Female) **Role Summary** Execute safety engineering activities for nuclear equipment and installation modifications. Manage safety documentation, risk analyses, and compliance with regulatory standards (article 26, FEMDAM). Coordinate technical reviews, present findings to expert panels, and ensure conformity of safety evidence throughout the modification lifecycle. **Expectations** - Deliver accurate safety dossiers within set deadlines - Maintain clear, concise communication with multidisciplinary teams - Uphold strict adherence to safety and regulatory requirements - Exhibit analytical, critical, and synthetic thinking **Key Responsibilities** - Prepare and monitor safety file packages supporting modification requests - Conduct on‑site inspections of proposed equipment and installation changes - Develop risk analyses for work and modification activities, assessing impacts on safety reference documents - Present safety dossiers to expert committees and manage follow‑up actions - Specify safety requirements and evaluate conformity of evidence documents (work plans, test reports, etc.) - Track and verify that Safety Integrity Requirements (EIP) are met during modifications **Required Skills** - Proficiency in French and English (technical writing and verbal communication) - Strong analytical, critical‑thinking, and synthesis capabilities - Ability to collaborate effectively in cross‑functional teams - Demonstrated capacity to meet scheduling commitments and respond to changing priorities **Required Education & Certifications** - Graduate of a recognized engineering school or Grande École - Preferable professional experience or internship in the nuclear sector (public or private)

Valence, France

Remote

23-01-2026