Process Engineer – Plasma & Hydrogen Production

About the role

As a Process Engineer at PLENESYS, you will drive the technical development of our plasma‑based solutions and hydrogen production processes. You will work in a fast‑moving DeepTech startup, collaborating with multidisciplinary teams to bring innovative industrial processes to market.

Key responsibilities

• Design, commission and test plasma equipment and hydrogen production units at client sites.
• Develop P&ID and PFD diagrams, perform pre‑design, sizing, cost studies and thermodynamic simulations.
• Create equipment data sheets, conduct HAZOP/HAZID analyses and produce cause‑effect matrices.
• Prepare 3D layouts, mechanical designs and detailed specifications using CAD tools.
• Lead experimental campaigns, perform quality control, and ensure compliance with industrial standards.
• Write technical reports, calculation notes, and certification documents.
• Interact with suppliers for purchasing and technical exchanges.

Required profile

• Engineer or PhD (5‑8 years of higher education) in process or mechanical engineering.
• Relevant professional experience or internships in similar roles.
• Strong English proficiency and excellent technical writing skills.
• Rigorous, detail‑oriented, autonomous and able to work well in a team.

Required skills

• Knowledge of hydrogen standards.
• Proficiency with CAD software (SolidWorks) and mechanical design.
• Solid background in fluid dynamics, heat transfer and thermodynamics.
• Experience with experimental measurements and industrial standards.
• Instrumentation expertise; gas chromatography is a plus.
• Ability to create P&ID/PFD, perform equipment sizing and conduct HAZOP/HAZID analyses.

What we offer

• Open‑ended (permanent) contract under the French SYNTEC collective agreement.
• Competitive salary based on skills and experience.
• Opportunity to work in a human‑sized, innovative startup environment.
• Potential travel within France and internationally.