Startup Engineer

HYDROTHANE STP B.V. (NL) is looking for a

Process Design Engineer & Start‑Up Advisor (F/M)

Localisation : 's Hertogenbosch , The Netherlands

or

Rueil‑Malmaison, France

Axens Presentation :

Axens group provides a complete range of solutions for the conversion of oil and biomass to cleaner fuels, the production and purification of major petrochemical intermediates, the chemical recycling of plastics, all natural gas treatment and conversion options along with water treatment and carbon capture. The offer includes technologies, equipment, furnaces, modular units, catalysts, adsorbents and related services. Axens is also specialized in Carbon Capture. Axens is ideally positioned to cover the entire value chain, from feasibility study to unit start-up and follow-up throughout the entire unit life cycle. This unique position ensures the highest level of performance with a reduced environmental footprint. Axens global offer is based on highly trained human resources, modern production facilities and an extended global network for industrial, technical supports & commercial services.

Axens combines the friendliness of a company on a human scale and the influence of a multinational environment whose customers are spread over more than 85 countries.

Axens is an IFP Group company.

Its subsidiary, HydroThane STP is a specialist in anaerobic industrial wastewater treatment with more than 35 years of experience and a proven track record across 170+ installations in over 35 countries. Large international companies are among the customers of HydroThane STP technologies. Due to the rapid growth of our company, we are looking for a motivated employee for this position.

HydroThane STP is informal, entrepreneurial and flexible. We enjoy our work and are happy to invest our knowledge and time in your development. We offer a very varied position within a company with a future, where taking responsibility and initiative is encouraged.

Due to the rapid growth of our company, we are looking for a motivated employee for the position of Process Design Engineer & Start-Up Advisor.

Missions :

What will you do?

This position combines process design engineering with commissioning and start‑up advisory activities. You will be assigned to engineering or start‑up tasks depending on project needs and workload.

The Process Engineering activities are dedicated to execution of the projects for our international customers with either limited scope (basic engineering, supply of proprietary equipment, supervision of site activities) or the complete treatment solution (turn-key projects).

The Start-up activities concern advising and supporting our client during equipment installation, commissioning and start-up steps of new units

1. Process Design Engineering

· Simulate process units to establish material and heat balances and deliver unit documentation (PFD, P&ID, MMD).

· Size equipment (pumps, reactors, columns, compressors, drums, etc.).

· Size piping and specify instruments and safety elements of the unit.

· Participate in customer meetings throughout the project lifecycle.

· Occasionally contribute to the development of new technologies and continuous improvement of existing solutions.

2. Start‑Up / Commissioning Advisory

· Ensure that construction and installation activities are carried out in accordance with project requirements and industry standards.

· Prepare and deliver commissioning and start-up procedures and guidelines for customers and project teams.

· Provide on-site technical support during commissioning and start-up phases to ensure safe, efficient, and successful project delivery.

· Troubleshoot operational issues and recommend improvements to support reliable and optimized plant performance.

· Monitor commissioning activities and performance testing to verify that operational objectives are achieved.

· Collaborate with customers, contractors, and internal stakeholders throughout project execution and start-up activities.

· Capture and share lessons learned and field feedback to support continuous improvement across projects.

· Contribute to the development, maintenance, and improvement of standard commissioning and start-up documentation, tools, and best practices.

Knowledge and Required Level :

You hold a Master’s degree (or equivalent) in Bioprocess Engineering, Chemical Engineering, or a related field, combined with 3 to 5 years of experience in industrial process design. You communicate effectively in English, and additional language skills are a plus in this international environment.

Associated Skills :

· Curious and open‑minded; you thrive in international settings and adapt quickly to collaborative, multicultural and small company mindset.

· Flexible with changing schedules and willing to travel regularly

· Rigorous and result‑oriented; You remain composed under pressure and deliver pragmatic solutions, supported by excellent interpersonal skills and collaborative mindset.

· Strong commitment to HSE standards with high vigilance regarding safety and security.

· Excellent writing skills; able to synthesize complex information into clear, concise deliverables.

What We Offer

· International exposure with clients and partners across 15+ countries, offering regular travel throughout Europe and opportunities for global expansion.

· Strong backing from Axens Group, providing financial stability, a global network, and a long-term growth vision.

· Technical excellence at your fingertips, with full support from HydroThane's technology and engineering team for design and operation of industrial units.

· Hybrid working environment, based in ’s-Hertogenbosch (NL) or in Rueil (FR), with up to 2 days of home office per week, in line with company policy.

· A unique growth opportunity to join a dynamic and expanding business where your contribution will have a direct and visible impact.