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Production Process Engineer (Battery)

Leiden, Zuid-Holland, NetherlandsBattery lab

Job description

Do you want to contribute to a more sustainable world? Are you excited to help shape the future of battery technology and consequently the future of consumer electronics and mobility? Can you not wait to dive into a VC-backed deep tech scale-up with the ambition to change the world?


We are looking for an enthusiastic Production Process Engineer to join our innovative and ambitious organization.


About LeydenJar

LeydenJar is a high-tech company, developing pure silicone anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:

  • boost Li-ion battery energy density by 70% by using 10x thinner anodes
  • improved cycle life to >450
  • achieved fast charging to 60% in under 10 min!

We are currently still in an R&D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026.

We are looking for a dedicated Production Process Engineer to support our pre-pilot battery cell manufacturing operations, someone who enjoys working with high-tech equipment and can ensure that manufacturing processes are carried out precisely and efficiently.

You are eager to learn and excited to work with us to make better batteries. You will work close together with technicians, battery engineers and production process engineers. You will report to Head of Battery, whilst being functionally aligned with the Production Department. You will be part of a young, international, ambitious and diverse team that is determined to make a better world with cleaner energy. 

It is a full-time position and working from home is not possible. You will mainly be working in Leiden, and may occasionally work in Eindhoven.

You will be responsible for:

  • Primary responsibility of battery cell production in Leiden
  • Process engineering - continuous improvement of process and production flows to get most efficient throughput, highest quality and utmost safety.
  • Lab operations - professionalize documentation and lab operations by ensuring up-to-date SOPs, maintenance schedules, stock management/forecasting, risk assessments etc.
  • Support and collaborate with battery engineers on execution of battery research & development projects
  • Support to the Anode Production in Eindhoven, and Quality Control / Quality Assurance department
  • Record and reporting on key performance indicators (KPIs) for battery cell production
  • Optimal plan making and scheduling with technicians, engineers, and stakeholders.

Job requirements

About you:

  • You have a bachelor degree in chemical engineering or mechanical engineering or applied science or comparable education.
  • You have 3+ years working experience in a production environment as production engineer, production manager or process engineer.
  • Experience in a battery cell production environment is a big plus. 
  • You have a high quality production mindset, which you are able to transfer to others.
  • You possess affinity to large, high-tech machines and you are comfortable in taking responsibility to fix practical problems and finish the job on your own.
  • You are relentless in pursuing quality, but adaptable to changing circumstances because you understand that working in a scale-up means that many things happen and plans can change quickly when needed.
  • You communicate clearly and directly up and down the chain, bridging interests and concerns of stakeholders, signalling problems quickly, and finding solutions. You enjoy listening and talking to people and bring a smile to work. You are a morale-booster in the lab.
  • You have demonstrable experience with Six Sigma and are comfortable with analyzing data to make data-driven decisions.
  • You are fluent in English


Why LeydenJar?

🌟 Unleash your potential: Dive into a realm where personal growth meets ownership, with the backing to achieve your career aspirations.

💼 Benefits beyond the basics: Enjoy a treasure trove of perks, from a comprehensive pension plan to travel reimbursement, insurance coverage, and even a mental health platform. And yes, there's fresh fruit every Monday because why not?

⏰ Work your way: Embrace the freedom of flexible hours and hybrid working, complemented by a generous 25 vacation days annually.

🍹 Thirsty for Fun: Join us every first Thursday for 'Thirsty Thursday,' where we unwind and share good vibes in a laid-back setting!

🎉 Fun with a purpose: Dive into our calendar of internal events, mixing business with pleasure, and fuel your personal development with exclusive trainings and courses.


Are you ready to take on the challenge as a Production Process Engineer?

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.

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