Senior Mechanical Engineer

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At Spiral Hydrogen you have a chance to do something extraordinary: shape the future of energy.

We started with a big question: what does civilization need to flourish? The answer we came to is: cheap green energy.

We are starting with hydrogen. Our novel electrolyzer design, which achieves 95% electrical efficiency (HHV) and eliminates many costly components, can deliver green hydrogen below gray hydrogen costs.

We just need you to make it happen.

So far, we have validated the core design, protected the IP, and got VC funding. Now we are preparing for a 100 kW pilot. 

We are now looking for a mechanical engineer to own the mechanical design and build of the electrolyzer stack.

What you’ll do

This is a founding role: you'll own the mechanical design and build of the electrolyzer, collaborating with chemical and process engineers. From the first 100 kW system onward, you'll help shape its evolution as the team grows.

In practice, you will:

• Own the mechanical design and physical build of the electrolyzer, from first hardware through iteration and scale-up.
• Build and maintain full 3D CAD assemblies.
• Obsess over sealing, leakage, tolerances, wobble, fatigue, and assembly.
• Design and build test rigs and fixtures that measure performance reliably.
• Select and validate materials for durability and compatibility.
• Be open to continuous learning in a dynamic environment.
• Iterate fast: build → test → break → improve.
• Help define BOMs and work with suppliers to get parts made.
• Spend real time in the workshop and lab.

You’ll often work on problems where nobody knows the right answer yet.

What we’re looking for

Background-wise:

• Substantial experience building electrochemical systems and rotating hardware (roughly 5+ years in industry or equivalent).
• Training in mechanical engineering, aerospace, applied physics, or similar (Master’s or equivalent ability). Skills matter more than credentials.
• Solid materials + electrochemistry intuition. You don’t need to be an electrochemist, but you should understand things like alkaline compatibility, corrosion, and degradation.
• Comfortable with basic electrical work (sensors, wiring, motor interfaces). We don’t plan to hire a dedicated electrical engineer initially, so you should be able to handle straightforward electrical tasks.
• Fluid/CFD intuition is a plus (heavy simulation not required).

You’re likely a great fit if you:

• Default to ownership. You take initiative, don’t wait for instructions, and drive ambiguous problems to completion.
• Learn fast. You pick up new domains quickly and make good trade-offs under pressure.
• Are a strong teammate (and future leader). You communicate clearly, give/receive feedback well, and can coordinate others as the team grows.

Practicalities

• Location: On-site in Delft, Netherlands (office + workshop at YES!Delft)
• Time commitment: Full-time
• Team: Small, technical, founder-led
• Compensation: Competitive salary + equity for early employees
• Start: As soon as possible
• Visa & relocation: If we like you, we’ll make it happen :)

If this sounds exciting, let’s talk!

Apply here: https://forms.gle/YQZvdSu7Rw6ZeQwA9

PS! Know someone who is a good fit? Recommend them to apply! If they pass the work trial, you’ll get a 1,000€ (one thousand euro) bounty.

Figure 1. The office spaces. You’ll be working alongside other deeptech startups the YES!Delft offices.