Lead Mechanical Engineer Energy Storage Systems

Location: Amsterdam, NL Team: Engineering Travel: 20%

Moonwatt is looking for a Lead Mechanical Design Engineer to join our Energy Storage Systems (ESS) team as we accelerate the deployment of cutting-edge sodium-ion battery technology. This role is central to the design and development of utility-scale energy storage systems, with a strong focus on battery module and pack design which is a critical and non-negotiable requirement for this position.

What You'll Do

• Own the mechanical design of Moonwatt's high-voltage ESS, from concept to production, including prototyping, testing, and manufacturing support.
• Lead the mechanical architecture and packaging of batteries, ensuring optimal thermal performance, structural integrity, and manufacturability.
• Develop 3D CAD models (SolidWorks or equivalent), perform detailed FEA analyses (for seismic, shipping, and compliance), and simulate thermal management strategies.
• Define and manage mechanical and thermal requirements at both the component and system levels.
• Collaborate across disciplines (electrical, controls, logistics, and manufacturing), and interface with external partners, suppliers, and contract manufacturers.
• Work in a fast-paced, hands-on environment that values rapid prototyping, iteration, and practical validation.
• Support a culture of initiative, ownership, and teamwork where no task is too big or too small.

Must-Have Qualifications

• Master's degree in Mechanical Engineering or a related field.
• 5+ years of experience in mechanical design, with a proven track record in battery module and/or pack design (this is a core requirement).
• Deep knowledge of mechanical and thermal engineering principles.
• Expertise in commercial CAD and PLM tools; experience with FEA and thermal simulation techniques.
• Experience designing and manufacturing medium to high-volume mechanical or electro-mechanical products.
• Hands-on experience with prototyping, testing, and system validation.
• Passion for clean energy, sustainability, and innovation.
• Willingness and ability to travel up to 20%.

Preferred (but not required)

• Experience with high-voltage power converters, or electrical enclosures.
• Familiarity with battery modeling, performance testing, and lifecycle analysis.

If you're an experienced mechanical engineer with a strong background in battery module and or pack design, and you're excited to shape the future of energy storage, we'd love to hear from you.