Process Engineer - Battery Laser Welding

About Stark

Stark builds the world’s most powerful electric motorcycles. From the VARG MX to the road-legal VARG EX & SM, our bikes have won world championships and are engineered to outperform anything with a combustion engine. We’re based in Sant Boi, Barcelona, growing fast (77% year‑on‑year), and building a team that will take us even further. If you want to work on a product that people are genuinely obsessed with, this is it. Stark will become the global market leader in premium motorcycles. Building premium motorcycles requires innovation and we need your help to make us succeed in building the backend for our AI systems. Our mission is to lead the way towards a sustainable motorcycle industry, by reducing plastic and CO₂ pollution. This will be achieved by building sustainable products that are superior to traditional technology in terms of Performance, Emotion and Design.

The Role

As expert in joining processes, you’ll be at the forefront of the creation of next‑generation electric motorcycles, batteries & associated products. You’ll be responsible for developing the whole joining processes from prototypes to series production in batteries including process qualification, validation and testing. Moreover you will train and qualify inline quality measurement systems, define tools and set requirements for the welding materials and geometry. You will therefore assist Stark’s R&D through advice on internal validation processes & design improvements for series production. You will be part of the growing team for “Production Process Development” and report to the Team leader and CTO as well. You’ll need to have hands‑on experience, developing complex assembly processes and the ability to thrive in a fast‑paced, evolving, and highly innovative environment.

What You’ll Do

• Be the technical lead of developing joining technologies (focus bonding/laser welding)


• Install and develop new bonding/laser welding processes


• Develop a robust process window for bonding/laser welding in series production for possible variations in the process Install and train online quality measurement systems to control the process in series production


• Set requirements for parts (materials/geometry) and tools (for welding)


• Define specifications for machines, tools and facilities


• Plan and assure that targets are achieved on time within the expected quality & costs.


• Conceptualize, bring‑up, prototype, test and deliver production welding processes, R&D and in‑line validation processes.


• Review and approve documentation including drawings, schematics, and detailed procedures.


• Ensure internal validation of the overall systems.


• Support testing and analyses in other areas of engineering or development.


• Support the transition to the manufacturing line.

What You Will Bring To Stark

• Mechanical Engineering degree or similar.


• Deep experiences in joining technologies with focus on bonding and laser welding


• Experiences in teaching automated welding machines with different materials & geometries


• Experiences in designing tools for welding and setting requirements for the parts and tools


• Strong analytical & problem‑solving skills


• Comfortable in a fast‑paced, ever‑evolving, highly innovative environment (startups or high‑tech companies).


• You have high standards for yourself and everyone you work with.


• Constantly looking for ways to innovate, improving your products performance, quality, and cost.


• Outstanding communication and interpersonal skills, fluent English is a must.

Why work with us?

• The chance to work on a product people are genuinely passionate about


• A fast‑growing company with real momentum


• A creative, international team based in Barcelona


• Competitive salary and benefits package


• Direct access to riders, race teams, and the product — this is not a remote‑from‑the‑product role


• Subsidized lunch in our in‑house restaurant


• Free access to our in‑house gym (including weekends!)


• 30 days of paid vacation

At Stark, we don’t just accept difference—we celebrate it, we support it, and we thrive on it for the benefit of our employees, our products, and our community. We are committed to creating an inclusive environment where everyone, regardless of gender identity, sexual orientation, race, religion, age, neurodiversity, or disability, feels a true sense of belonging. We believe that diverse teams make better decisions and that a culture of equity is a prerequisite for innovation.

Accessibility: If you require any reasonable adjustments during the application or interview process (such as assistive technology, extra time, or a specific format), please let us know at We encourage applications from underrepresented groups and are excited to see how your unique perspective can help us grow.

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