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About LeydenJar

At LeydenJar Technologies, we’re on a mission to redefine the future of energy storage. Our goal is to become the world’s innovation leader in advanced battery anodes, empowering the next generation of batteries that drive progress.

Why does this matter? Because the world needs higher energy density batteries not just for better consumer electronics, but for electric vehicles, e-flight, and beyond. While the battery industry typically advances by only 3% per year, our breakthrough pure silicon anode technology delivers an improvement of up to 70%, a true game changer. Often called the “holy grail” of the battery industry, our technology unlocks new possibilities for electrification, sustainability, and resilience in global supply chains.

What we do:

• We produce pure silicon anode rolls that fit seamlessly into existing battery cell manufacturing lines, enabling customers to make a quantum leap in performance or create entirely new product categories.
• Our initial focus is on consumer electronics, with automotive applications already in development.
• By leveraging semiconductor thin-film technology (plasma deposition) and scaling it to battery anodes, we’ve overcome the long-standing challenges of silicon in batteries, delivering durability and efficiency at scale.

To meet global demand, we’re scaling up:

• PlantOne in Eindhoven opens in 2026, producing anode rolls and validating our roll-to-roll production tools.
• PlantTwo, our large-scale production facility, will follow, establishing LeydenJar as a key player in the global battery market.

This is an enormous opportunity and an ambitious journey. It requires bold, creative, and diverse minds who share our passion for innovation and sustainability. At LeydenJar, we value different perspectives, inclusive collaboration, and gender equality because we know that diversity fuels breakthrough ideas.

LeydenJar Technologies is scaling rapidly and while doing so we are looking for a System Software (Maintenance) Engineer to join us in Eindhoven in our mission to boost battery technology. You will be part of the equipment department, which is responsible for the development of the new production tool (GEN3D). As the tool, developed together with our integration partner, is nearing completion you will be responsible for a smooth transition to the production department.

Our short term expectation:

• The application utilizes a model driven design, a client-server model. It assumes that you are familiar with Siemens PLC and C# software applications, and that you are willing to learn the concept of the model driven design used.
• You will work closely with (system)engineers, operators and external suppliers to identify and resolve software issues, implement updates, and enhance system functionality.

• You will be responsible for ensuring the stability, performance and reliability of our machine software application.
• As a Software Maintenance Engineer, your primary focus will be on diagnosing and fixing bugs, optimizing code, and ensuring that software systems continue to meet user needs and business goals.
• You will also be involved in monitoring system performance, applying patches, and updating documentation to reflect changes in the software.
• Your contributions will directly impact the user experience and operational efficiency of our software products.

Our long term expectation:

• Maintain Project Documentation
• Maintain the Software Requirements Specifications
• Maintain the knowledge inside Leydenjar to be able to support users after commissioning (training, troubleshooting, additional component development and fixes)
• Collaborate with data scientists and IT department
• Be involved in the future software architecture for the control of the next generation of production machines.

About you:

• You have a bachelor degree in Computer Science or equal level of education
• You have min 5+ years of working experience in software maintenance in a machine development environment in server-client architecture
• You have understanding of Software Development
• You have experience in Data interface technologies: OPC UA , Profinet, RS485
• You posses test driven development mindset
• Experience in commissioning processes e.g. FAT / SAT is an advantage
• Familiarity with safety standards and regulations (ISO IEC) is an advantage
• You have flexible/adaptive mindset (able to adapt to changing circumstances)
• You actively collaborate with colleagues, sharing knowledge and supporting others to achieve common goals
• You are pragmatic (able to set priorities based on limited information and act accordingly)
• You are action oriented and result driven teamplayer
• You have excellent communication skills

Why LeydenJar?

• Unleash Your Potential: Step into a workplace where growth and ownership go hand in hand. We empower every individual regardless of background, gender, or identity to thrive and achieve their career aspirations.
• Pension & Insurance Security: We care about your future. LeydenJar contributes 10% on top of your monthly gross salary toward your pension and life insurance, ensuring long-term security for you and your loved ones.
• Recharge & Refresh: Enjoy 25 vacation days per year (based on full-time hours) because work-life balance is essential for everyone.
• Travel Made Easy: We cover your home-to-work travel costs with €0.23 per kilometer or provide an NS Business Card for hassle-free public transportation.
• Continuous Learning: Access our online learning platform to develop your skills and unlock new opportunities for personal and professional growth.
• Diverse, Inclusive & Equal: Be part of an international team of 20+ nationalities, where everyone’s voice matters, and where diversity, equity, and inclusion are more than values they’re actions.
• Community & Connection: From team-building events and monthly lunches to year-end celebrations and inclusive gatherings, we create spaces where everyone feels welcome and engaged.

Do you want to take on the challenge?

We are looking forward to your application!

If you'd like to learn more about LeydenJar amazing team, see below:

At LeydenJar we value diversity, and we provide equal opportunities to all applicants without regard to race, color, ethnicity, religion, gender, pregnancy/childbirth, age, national origin, sexual orientation, disability, etc. If there are two or more applicants of equal suitability for a certain position, LeydenJar can under circumstances decide to select applicants based on positive discrimination in full compliance with all relevant and applicable law.