IT System Administrator (0.8 FTE)

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%ma 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 IT System Administrator to join us for 0.8 FTE (32hrs/week) in our mission to boost battery technology.

About the job

As our IT System Administrator, you will be the cornerstone of our IT operations. You will be responsible for maintaining, securing, and optimizing our entire IT infrastructure, from user devices and cloud services to network and server management. This role requires a hands-on approach in a fast-paced, continuously changing organization where urgency is key. We're looking for someone with a proactive attitude, who is eager to take on challenges beyond the core job description, such as helping out with cybersecurity initiatives or supporting IT projects for our new factory. You are the go-to person for IT support, ensuring our team can work efficiently and securely as we scale.

In this role you will be responsible for:

IT Operations & Infrastructure Management

• Manage and maintain our on-premise and cloud-based infrastructure, including Azure resources, servers, and storage systems.

• Monitor the health and performance of all IT network devices (switches, routers, firewalls, wireless access points) and troubleshoot connectivity issues.

• Perform regular backups of critical data and test restore procedures to ensure business continuity.

• Apply security patches and updates to all network, server, and hardware in a timely manner.

• Monitor network and server utilization to perform capacity planning and performance tuning.

Workspace & User Support

• Provide first-line IT support to all employees, resolving technical issues efficiently.

• Manage the complete lifecycle of user devices (laptops, mobile phones), including configuration, deployment, and implementing security policies via Mobile Device Management (MDM).

• Administer our Microsoft 365 environment, managing user accounts, access control, and Conditional Access Policies.

• Administer SharePoint, including application and item permissions, to structure and monitor resources.

• Manage the full lifecycle of employee hardware and software, including setup for new employees (onboarding) and decommissioning for departing staff (offboarding).

Security & Process Improvement

• Implement and manage endpoint security configurations, including anti-virus, anti-malware, and anti-encryption.

• Conduct vulnerability scanning and coordinate patching to remediate identified security risks.

• Develop and maintain clear documentation for IT systems, network diagrams, standard operating procedures (SOPs), and user guides.

• Develop and conduct training sessions for new employees on IT systems, security best practices, and company policies.

• Track and manage software licenses to ensure compliance and optimize costs.

About you:

• You have successfully completed an MBO or Bachelor's program in IT or a similar area of study.

• 1-2 years of work experience in a System Administrator or similar IT infrastructure role is preferred.

• You have hands-on experience with Microsoft 365 and Azure administration, network management, and endpoint security solutions.

• You are mobile, possess a valid driver's license, and are capable of working at our locations in both Leiden and Eindhoven.

• You are capable of thinking big while doing small, setting future-proof standards that can support our rapid growth.

• Customer Service Orientation – You respond promptly and effectively to user needs, ensuring a positive support experience.

• Teamwork – You collaborate openly with colleagues to solve problems and achieve shared goals.

• Problem Analysis – You identify root causes of technical issues and develop practical, long-term solutions.

• Stress Tolerance – You maintain focus and performance under pressure, especially during system outages or incidents.

• Career and Self Development – You actively seek opportunities to grow technical knowledge and stay current with evolving technologies.

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 (Udemy) 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.

Are you ready to take on the challenge as a IT System Administrator ?

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.