Managing Director
Joep Coenen
Process systems, safety, project delivery and integrated energy systems.
About Hystream
Independent by choice. Integrated by nature.
Hystream develops and integrates practical hydrogen and energy systems for B2B customers, with a deliberate focus on projects that can be realised and operated successfully.
How we think
Projects only work when the whole system works.
Technology, economics, safety, regulation and people are interconnected. Hystream brings these dimensions together, while keeping technology and supplier choices open.
Independent
No single technology or supplier dependency.
Integrated
Business case, subsidies, engineering, permitting, safety and commissioning in one team.
Safe by design
Safety and compliance from the start, not as a final check.
Commercially minded
Technical choices are continuously tested against CAPEX, OPEX, funding and offtake.
Collaborative
If you can share, you can multiply.
Human Energy
We follow the energy in the system - and in the people around it.
Our team
Different backgrounds. One focus: making projects work.
The team combines project development, engineering, safety, business development, stakeholder management, marketing, finance and operations.
Business Developer
Allard Friedrich
Chemical engineering, hydrogen production, policy and business development.
HR, Office & Finance Manager
Astrid IJssennagger
Organisation, finance, project support and keeping Hystream connected.
Project Engineer
Werner Kastelein
Hydrogen engineering with practical experience from Forze Hydrogen Racing.
Business Developer
John Scholtz
Programme management, sustainable energy and stakeholder alignment.
Project Engineer
Mariëtte de Groen
Chemical engineering, COâ‚‚ conversion and pilot-plant development.
Project Engineer
Seymour Overdevest
Engineering and project execution focused on practical results.
Project Engineer
Lucas den Boef
Chemical engineering and practical support for safe energy-system development.
Online Marketeer
Britt van Hal
Marketing, content creation and clear communication around complex projects.
Office Assistant
Petri Koop-Dekkers
Structure, coordination and practical support across the organisation.
Intern
Reda Boudadi
Chemical technology, process thinking and technical problem solving.
Intern
Sebastiaan Matthews
Supporting practical project work and contributing fresh technical insight.
Intern
Thijmen Ploos van Amstel
Mechanical engineering with hands-on design and build experience.
Our 4S principles
Safe • Simple • Standard • Solid
Four practical principles that guide how we design, select, integrate and operate systems.
Safe
Safety and environmental performance come first. We use proven technology, recognised standards and identify, quantify and mitigate risks from the start.
Simple
Minimal complexity. We strip a design back to its core and only add components or partners when they add clear value.
Standard
We prefer proven, scalable technology and recognised standards. Standardisation improves repeatability, flexibility and maintainability.
Solid
Reliability protects users and project economics. We design for availability and maintainability so systems keep performing in operation.
Careers
Think different. Act now.
We regularly look for engineers, working students and interns who want to realise practical energy and hydrogen projects.