HR Officer

Job description

About Leyden Jar

At Leyden Jar 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:

• Plant One in Eindhoven opens in , producing anode rolls and validating our roll-to-roll production tools.

• Plant Two
  , our large-scale production facility, will follow, establishing Leyden Jar 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 Leyden Jar, we value different perspectives, inclusive collaboration, and gender equality because we know that diversity fuels breakthrough ideas.

We are looking for a temporary HR Officer to support our team for a period of 7 months. In this role, you will be responsible for managing day-to-day HR operations and supporting the HR Manager across a wide range of activities. You will play a key role in facilitating recruitment, onboarding, and the performance management cycle, ensuring a smooth and positive employee experience.

This is a great opportunity to gain valuable, hands‑on experience within a fast-growing, international scale‑up environment where no two days are ever the same.

In your role you will be:

• Assist in daily HR operations and employee administration tasks.

• Provide administrative support on performance management inflow and outflow.

• Partner with Heads of Departments to facilitate recruitment.

• Review the Applicant Tracking System daily to find high‑quality candidates.

• Implement recruitment, selection, and guidance of employees.

• Provide vacancy texts, manage, and update them on various channels.

• Select candidates, organize interviews with managers, and participate as needed.

• Act as a point of contact during recruitment and selection procedures.

• Draw up individual standard employment contracts.

• Coordinate and provide support for new hire on‑boarding and relocation, if needed.

• Take care of the exit process at the request of the employee, including conducting exit interviews.

• Monitor the implementation of the Gatekeeper Improvement Act and maintain contacts with the Occupational Health and Safety Service.

• Monitor and analyze the organization’s absenteeism figures and propose solutions to the HR Manager.

• Maintain a network of training and education providers and keep up with market developments.

• Select possible training and education providers that match the set learning objectives and present these to the HR Manager.

• Monitor the progress and quality of the offered training courses.

• Promote and support Leyden Jar fun initiatives and positive culture.

Who are you?

• A completed education MBO or similar level in HR or related field

• Min 3+ years of experience in an HR support role

• Experience with HR (ATS, payroll)…