LeydenJar Technologies boosts the energy density of li-ion batteries by replacing the traditional graphite anode with a nanoporous, pure silicon anode. This yields cheaper (-20% costs), greener (-85% CO2 footprint) and higher energy density batteries (+70% as compared to state-of-the-art, 1350Wh/L).


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 Intern with a background in Mechanical / Aerospace / Applied Physics to join our innovative and ambitious organization About LeydenJarLeydenJar 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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. About the job As an intern in the equipment team, you will be instrumental in pushing the boundaries of modelling at LeydenJar. You will work towards developing a network modelling tool set for high Knudsen numbers after which you can perform measurements to validate the model. At LeydenJar we believe in validation of claims before arriving at conclusions. To succeed in this role you will need to have a strong background in coding, preferably in Python, you also need to have a good understanding of fluid dynamics &amp; thermodynamics. You will report to the Senior Vacuum System Engineer. Your primary location must be Eindhoven and it is acceptable to work remotely for one day a week. The duration of the internship would be a minimum of 6 months and must be required by your university.  Your tasks include, but are not limited to:<ul><li>Developing a 1D steady state &amp; transient network model</li><li>Conducting a literature survey of experimental datasets to validate available techniques for vacuum modelling</li><li>Validate the models with experiments</li><li>Perform sensitivity studies on the variables</li><li>Share a final report of the findings</li></ul>About you: <ul><li>You are currently in the process of completing your Master’s studies in the Netherlands and are required to complete an internship as part of your studies. </li><li>You have prior experience or classwork in programming, or a strong drive to learn.</li><li>You have fluent English reading and writing skills.</li><li>You have a strong sense of curiosity and enjoy systems building.</li><li>Bonus points for interest in the energy transition and novel battery technologies. </li></ul> 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, 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. 🍹 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?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.

Internship - Modelling of Vacuum Systems

<div>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? </div>We are looking for an energetic Materials Scientist/Engineer to join our innovative and ambitious organization. About LeydenJarLeydenJar is a high-tech company, developing pure silicon anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li></ul><ul><li>improved cycle life to &gt;450</li></ul><ul><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026.<div> </div><div><div>Your mission</div>As a Materials Scientist/Engineer, you will be responsible for designing experiments on our PECVD production tool to develop new morphologies in Leyden-Jar’s Si anodes, and understanding and correlating the morphology parameters to the battery performance. You will be working in the Si Research and Development Team supporting in materials characterization, finding critical to quality parameters, and developing new processes enabling high-performance Si anodes. It is expected that you have good knowledge of thin-film characterization methods, PECVD processes and can communicate your findings to the international team of LeydenJar. Your primary location will be Eindhoven, but you will also be supporting Leiden location. You are willing to travel on incidental base.You report to the Head of Si Research and Development and your skills will complement dynamic team of Materials &amp; Data Scientists and Engineers. You will be working in a dynamic scale-up environment as part of an international, ambitious and diverse team that is determined to make a better world with cleaner energy. You will gain valuable, on-the-job experience in a scale-up multi-national company, where no day is ever the same. In this versatile role for lots of aspects, you will have a chance to develop yourself by being leading and involved in the various projects of this quickly growing company. You will be working on:</div><div>- Designing and executing experiments on our PECVD tools towards new Si morphologies.- Supporting in the development of new metal/alloy foils with external partners.- Thin film characterizations on Si anodes using in-house and external facilities.- Assist in data analysis, in coordination with other team members and data scientists.- Developing new processes on Si anodes after deposition.- Developing PECVD processes to grow Si anodes with process modelling and simulation. - Contributing towards IP generation of the company.</div><div>Who are you? - Medior level or higher, 3+ years of relevant experience in process/metal/battery industry.- Background in metallurgy, materials science, or applied physics (BSc or higher).- Fluent in English language.- Experience in PECVD processes and/or Thin Film Characterization and/or Metallurgy is a plus.- Knowledge of metals and alloys is a plus.- Experience in anode manufacturing is a plus.- Hands-on attitude, with affinity for data analysis, documentation, and presentation.- You are able to multi-task and work independently in a fast-paced environment and act with a sense of urgency.- You show initiative on improvement projects and can lead such projects.- Experience with certification projects is a pre, especially ISO9001/ISO14001/IATF16949.- You communicate clearly and concisely, both orally and in writing. </div>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. <div><div> </div></div><div>Do you want to take on the challenge as an Materials Scientist,? We are looking forward to your application! If you'd like to learn more about LeydenJar amazing team, see below: <a href="https://www.rtlnieuws.nl/nieuws/video/video/5357356/5-minuten-je-telefoon-opladen-met-deze-nederlandse-accu-kan-dat-straks"> </a> 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. </div>

Materials Scientist/Engineer - Silicon R&D

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 seeking a dynamic and experienced Business Controller (climate tech) to join our team and drive financial excellence within our organization. The Business Controller will play a pivotal role in overseeing the financial operations of our battery company, ensuring strategic alignment and sustainable growth. About LeydenJarLeydenJar 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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. Your Mission  As a Business Controller you will support the business with your analytical skillset and proactive approach. You will be responsible for: <ol><li>Financial Planning and Analysis:<ul><li>Develop and execute financial planning processes, including budgeting, forecasting, and long-range planning.</li><li>Analyze financial performance metrics and industry trends to provide insights and recommendations for strategic decision-making and the participation of lead finance projects. </li><li>Collaborate with senior management to set financial objectives and develop strategies to achieve them.</li></ul></li><li>Financial Reporting and Compliance:<ul><li>Prepare accurate and timely financial reports, including monthly, quarterly, and annual financial statements. For instance, ESG reporting</li><li>Ensure compliance with accounting standards, regulatory requirements, and internal policies.</li><li>Coordinate external audits and liaise with auditors to facilitate the audit process.</li></ul></li><li>Cost Management and Control:<ul><li>Monitor and analyze costs, expenses, and revenue streams to identify opportunities for cost optimization and efficiency improvements.</li><li>Implement cost control measures and monitor adherence to budgets and financial targets.</li><li>Project , Grand and subsidy control.</li></ul></li><li>Risk Management:<ul><li>Identify financial risks and develop strategies to mitigate them, ensuring the financial stability and resilience of the company.</li><li>Establish and maintain robust internal controls to safeguard assets and ensure the integrity of financial reporting.</li><li>Stay abreast of industry regulations and market developments that may impact the company's financial performance.</li></ul></li><li>Business Partnering:<ul><li>Collaborate with cross-functional teams, including legal, HR, and research and development, to provide financial insights and support strategic initiatives.</li><li>Serve as a trusted advisor to leadership team, providing actionable financial analysis and recommendations to drive business growth.</li><li>Communicate financial information effectively to non-financial stakeholders and contribute to cross-functional projects.</li></ul></li><li>Continuous Improvement:<ul><li>Drive process improvements and operational efficiencies within the finance function.</li><li>Identify opportunities for automation and optimization of financial processes and systems.</li><li>Stay updated on best practices and emerging trends in financial management and implement relevant practices within the organization</li></ul></li><li>Business cases</li><li>Report to the CFO</li></ol>About you:<ul><li>Bachelor's degree in Finance, Accounting, Business Administration, or related field; MBA or CPA preferred.</li><li>Minimum of 5 years of experience in financial management,</li><li>Strong analytical skills and ability to translate complex financial data into actionable insights.</li><li>You have a strong eye for detail</li><li>Excellent communication and interpersonal skills, with the ability to collaborate effectively across all levels of the organization.</li><li>Proficiency in financial software and ERP systems; advanced Excel skills required</li><li>Strategic mindset with a focus on driving results and continuous improvement.</li><li>A great team player and always willingly to learn</li><li>Fluency in English and Dutch verbally as well as in writing.</li></ul>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 Business Controller ?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.

Business Controller ﻿(climate tech)

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 energetic Werkstudent / Working Finance Student (w/m) to help building our innovative and ambitious organization.  About LeydenJarLeydenJar 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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. Finance support We are looking for a super-driven and eager colleague to take our efforts to the next level. You will assist in general finance activities and deliver support to the team with projects. You report directly to the Financial Controller.  You will be responsible for: <ul><li>Manage accounts receivables/payables</li><li>Manage additional invoices and credit notes</li><li>Reviewing declarations of service providers</li><li>Preparing Management presentations</li><li>Report on Finance KPIs</li><li>General administrative tasks related to accounting &amp; finance</li></ul>About you:<ul><li>Bachelor's degree in Finance or currently enroll in University or HBO studying (Accounting or finance)</li><li>Working experience min of 0-1 year in a similar field </li><li>Available parttime ( 1 or 2 days a week max)</li><li>You have a strong eye for detail</li><li>Excellent communication and interpersonal skills, with the ability to collaborate effectively across all levels of the organization.</li><li>Proficiency in financial software and advanced Excel skills required.</li><li>A great team player and always willingly to learn</li><li>Proficiency in Dutch and English both oral and written. </li></ul>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 Werkstudent / Working Finance Student  ?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.

Werkstudent / Working Finance Student (climate tech)

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  Data analyst/ Data Systems Intern to join our innovative and ambitious organization. About LeydenJarLeydenJar 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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. About the job As a Data Analyst/Data Systems Internin the Si R&amp;D Team, you will be responsible for completing end-to-end projects in data management, ingestion, visualization and analysis. Specifically, you will work closely with stakeholders in the Quality Control and Battery teams to define requirements, ensure orderly data collection, and implement dashboards in PowerBI to fulfill our internal users’ needs. You will report to the Senior Data Scientist. Your primary location can be in Leiden or Eindhoven and it is acceptable to work remotely for one day a week. The duration of the internship would be a minimum of 6 months and must be required by your university. Potential projects include designing and building an end-to-end system to manage product specifications and display production results, and completing a data pipeline to preprocess and visualize battery performance metrics. Relevant technologies include Azure cloud tooling (Azure Synapse, Data Factory), Python, Excel, and PowerBI. About you: <ul><li>You are currently in the process of completing your Bachelor’s or Master’s studies in the Netherlands and are required to complete an internship as part of your studies. </li><li>You have prior experience or classwork in programming and/or data analysis, or a strong drive to learn.</li><li>You have fluent English reading and writing skills.</li><li>You have a strong sense of curiosity and enjoy identifying the root cause of problems.</li><li>Bonus points for interest in the energy transition and novel battery technologies. </li></ul>What can you expect from us ?  <ul><li>Unique experience in a rapidly scaling VC-backed start-up environment.</li></ul><ul><li>Chance to work on potentially world-changing technology that can be a game changer to a range of industries and a key enabler for the energy transition.</li></ul><ul><li>Great colleagues; at LeydenJar you will be part of a multi-national, ambitious, innovative and entrepreneurial team/20+ different nationalities!</li></ul> 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, 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. 🍹 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 Data Analyst/Data Systems Intern ?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.

Data Analyst/Data Systems Internship

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 B2B Product Marketing Internship to join our innovative and ambitious organization. To start on 01-04-2024.  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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;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 B2B Product Marketing  Intern to support our team.  You are eager to learn and excited to work with us to make better batteries. You will work close together with technicians, battery engineers,  production process engineers and other departments . You will report to Business Developer.  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:<ul><li>Conduct market research to identify trends, competitive landscape, and customer needs in the battery industry. </li><li>Analyze data to provide insights for product development and marketing strategies.</li><li>Assist in the development of new battery products by collaborating with cross-functional teams including engineering, manufacturing, and sales. Provide input on product features, specifications, and pricing based on market research and customer feedback.</li><li>Support the creation and execution of marketing campaigns to promote our battery products. This includes content creation for social media, website, and marketing materials</li><li>Assist in managing digital marketing channels such as email marketing,  advertising, and social media ads</li><li>Engage with customers through various channels to gather feedback, address inquiries, and build relationships. </li><li>If necessary, we may require you to perform activities normally undertaken by others or to take on additional activities.</li></ul>About You: <ul><li>Currently enrolled in a Bachelor’s or Master’s degree program in Marketing, Business, Engineering, or related field.</li><li>Strong analytical skills with the ability to gather, analyze, and interpret data.</li><li>Excellent written and verbal communication skills.</li><li>Proficiency in Microsoft Office suite and familiarity with digital marketing tools/platforms.</li><li>Ability to work independently as well as collaboratively in a fast-paced environment.</li><li>You are eligible to complete your internship in the Netherlands. </li></ul> 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:  There's fresh fruit every Monday ⏰ Work your way: Embrace the freedom of flexible hours and hybrid working. 🍹 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 B2B Product Marketing Intern?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.

B2B Product Marketing  Internship

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 LeydenJarLeydenJar 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:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;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: <ul> <li>Primary responsibility of battery cell production in Leiden</li><li>Process engineering - continuous improvement of process and production flows to get most efficient throughput, highest quality and utmost safety.</li><li>Lab operations - professionalize documentation and lab operations by ensuring up-to-date SOPs, maintenance schedules, stock management/forecasting, risk assessments etc.</li><li>Support and collaborate with battery engineers on execution of battery research &amp; development projects</li><li>Support to the Anode Production in Eindhoven, and Quality Control / Quality Assurance department </li><li>Record and reporting on key performance indicators (KPIs) for battery cell production </li><li>Optimal plan making and scheduling with technicians, engineers, and stakeholders. </li></ul>About you:<ul><li>You have a bachelor degree in chemical engineering or mechanical engineering or applied science or comparable education.</li><li>You have 3+ years working experience in a production environment as production engineer, production manager or process engineer.</li><li>Experience in a battery cell production environment is a big plus. </li><li>You have a high quality production mindset, which you are able to transfer to others. </li><li>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.</li><li>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.</li><li>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.</li><li>You have demonstrable experience with Six Sigma and are comfortable with analyzing data to make data-driven decisions. </li><li>You are fluent in English</li></ul> 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.

Production Process Engineer (Battery)

<div>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? </div>We are looking for an energetic Senior Battery Scientist to join our innovative and ambitious organization. About LeydenJarLeydenJar is a high-tech company, developing pure silicon anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:<ul><li>Boost Li-ion battery energy density by 70% by using 10x thinner anodes</li></ul><ul><li>Improved cycle life to &gt;450</li></ul><ul><li>Achieved fast charging to 60% in under 10 min!</li></ul>We are currently moving out of the R&amp;D phase, and beginning the scaled-up production of anode foil. LeydenJar Plant One will open in 2026.<div> </div><div><div>Your mission </div>As Senior Battery Scientist, you will lead projects and manage small teams towards rapid battery performance improvement using LeydenJar's unique 100% silicon anode. Your primary location will be Leiden. You are willing to travel on incidental base.You will report to Head of Battery. You will work especially closely together with the Battery R&amp;D team, the Battery Production Team, the Si R&amp;D team, the Data Science Team, the Product Management Team and the CTO.In this versatile role for lots of aspects, you will have a chance to develop yourself by leading and supporting the various projects of this fast-growing company. </div><div>You will be working on:<ul><li>Leading a small team of highly-skilled scientists to accelerate materials development and characterization, and deepen fundamental understanding of Leydenjar's 100% silicon anodes. </li><li>Project management and technical lead/advisor roles on short-term and long-term projects towards various customer application areas and improvement of cell performance metrics. </li><li>Characterization and optimization of cell chemistries including anode, cathode, electrolyte, and separator. Cell design and cell production process development. Liasing and managing relationships with new suppliers for lithium ion cell components. </li><li>Conducting thorough failure mode/mechanism analysis using state-of-the-art methods, and developing new insightful methods (chemical, electrochemical, mechanical). </li><li>Providing insights regarding anode properties and their impacts on cell performance metrics, guiding future development. </li><li>Developing and optimizing formation protocols with demonstrable impact on cell performance metrics.</li><li>Supporting application engineers by providing guidelines of chemical and mechanical cell designs for specific cell performance requirements.</li></ul></div><div>About you: <ul><li>You have at least 5 years' of industry experience after completing your MSc, or 3 years of industry experience after completing your PhD. Industry experience should be within the field of batteries or electrochemistry and related fields.</li><li>You have an exceptional understanding of lithium-ion technologies and electrochemistry. You have a well-developed understanding of cell failure mechanisms as impacted by materials design and processes.</li><li>Experience with silicon anodes or lithium metal anodes is a plus.</li><li>You have experience with pouch cell manufacture, formation processes and battery cell testing conditions. </li><li>You have experience of using state-of-the-art instrumental analysis and electrochemical testing to elucidate failure modes and failure mechanisms in battery materials.</li><li>You are excited to mix your working day between desk work and experimental lab work. You understand that 'getting your hands dirty' is sometimes the fastest way to understand new processes and gain deep insights.</li><li>You have demonstrable experience of leading successful technical projects, coordinating multiple parties towards ambitious targets with tight deadlines.</li><li>You have demonstrable experience of line management of master's-/PhD-level scientists. Providing coaching and guidance towards fulfilment of personal objectives and career development.</li><li>You are able to multi-task and work independently in a fast-paced environment and act with a sense of urgency. You are able to rapidly generate solutions to problems and move quickly to validate those ideas.</li><li>You communicate clearly and concisely, both orally and in writing. You question everything and answer with data. </li><li>You have a strong customer focus.</li><li>Experience with Six Sigma is a plus.</li><li>You are fluent in English. </li></ul> </div>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. <div><div> </div></div><div>Do you want to take on the challenge as Senior Battery Scientist? We are looking forward to your application! If you'd like to learn more about LeydenJar amazing team, see below: <a href="https://www.rtlnieuws.nl/nieuws/video/video/5357356/5-minuten-je-telefoon-opladen-met-deze-nederlandse-accu-kan-dat-straks"> </a> 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. </div>

Senior Battery Scientist/Engineer

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? About LeydenJarLeydenJar is a high-tech company, developing pure silicon anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. Are you eligible to complete your internship in the Netherlands? Let us know what you can bring to our company! 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.You recognize yourself in our values:  Dare to pioneerCreating a battery from a failed innovation from a completely different industry is daring. Daring to go for a 70% higher energy density instead of the yearly 3% is pioneering. Using new materials is pioneering. Building an international team is daring. Although LeydenJar is modest, there’s no denying its bravery. It is an important part of the DNA of LeydenJar. When faced with two identical options, employees are motivated to go for the most pioneering and daring option in order to innovate even more. Question everything - answer with data.LeydenJar is always challenging the status quo. That is how LeydenJar was founded, and that is how we keep pushing the limits. Everybody is invited to think along, there are no rules or dogmas. We bring suggested solutions and a willingness to discuss solutions, with no wrong answers. We share and respond to feedback with the best interest of our colleagues in mind and assume the same noble intent of our colleagues when they share and respond to feedback. We do, however, request solid answers, and back up our answers with data and research. Own setbacks and successWe are open about and stand united in obstacles, challenges and breakthroughs.We celebrate our successes, and we share and celebrate our failures with equal energy.We commit to overcoming the highest mountains, together. Prioritize actionWe are a young, fast-growing company with a can-do mentality.We prioritize action over no action.Taking action has brought us where we are now. Empower optimistic future We know why we’re here: the future is exciting, there are so many amazing innovations that can improve our world and make our lives more fun. The next generation batteries will not be possible without our technology. It will be unsafe, low in energy or not scalable. Without our technology, the most important electrifications will not be possible. We focus on the positive, we strive for positive change.

Looking for internship possibilities?

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 On-call Laboratory Technician to join our innovative and ambitious organization. About LeydenJarLeydenJar is a high-tech company, developing pure silicon anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:<ul><li>Boost lithium-ion battery energy density by 70% by using 10x thinner anodes</li><li>Improved cycle life of cells &gt;450 cycles</li><li>Achieved fast charging to 60% in under 10 min!</li></ul>We are currently exiting R&amp;D phase, and are moving towards commercial production of anode foil. LeydenJar Plant One will open in 2026. We are looking for a dedicated Laboratory Technician to support our pre-pilot battery cell manufacturing operations, someone who enjoys working with high-tech equipment and working with their hands, and can ensure that manufacturing processes are carried out precisely and efficiently. You will be part of a young, international and ambitious team that is determined to make an impact towards a better world with cleaner energy. You will be responsible for:<ul> <li>Production of battery cells in the lab; </li><li>Logging/processing data from the production builds;</li><li>Executing tests of battery cells using electrical equipment;</li> <li>Working according to lab planning and carrying out tasks to remain on schedule;</li><li>Maintenance of assigned machinery;</li> <li>Ensuring that the lab is a clean and safe environment, by adhering to all Health, Safety and Security guidelines and procedures;</li> <li>Stock-taking and ordering materials;</li> <li>Continuous improvement of procedures and safety in the lab.</li></ul><ul></ul>What we expect from you:<ul> <li>You are detailed and thorough;</li> <li>You like being hands-on and don’t enjoy sitting behind a desk all day;</li> <li>You have a positive attitude and are full of energy. You are a driving part of our Lab in Leiden, and you want to make it run even better and safer;</li> <li>You carry out plans as agreed, but you are flexible to change as required;</li></ul>And the following qualifications:<ul><li>Applied science/College (MBO/HBO) degree in a technical discipline;</li> <li>Good communication skills in English;</li> <li>Experience in a chemical / mechanical and / or electrical lab is a plus;</li> <li>Experience with some coding (Python) is a plus;</li> <li>Experience with HSE implementation in a lab/workshop environment;</li> <li>Capability of CAD drawing is a plus;</li> <li>Good skills in MS Excel / Word / PowerPoint, and fine with learning new IT apps;</li><li>You are an EU citizen (so you can freely work in The Netherlands) or you are in possession of a valid residence permit to work in The Netherlands.</li></ul> 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?🍹 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 Laboratory Technician?We are looking forward to your application!If you'd like to learn more about LeydenJar's 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.

Laboratory Technician (battery R&D) Leiden

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? About LeydenJarLeydenJar is a high-tech company, developing pure silicon anodes for a lithium-ion battery that will change the world. We are proud that, here at LeydenJar, we:<ul><li>boost Li-ion battery energy density by 70% by using 10x thinner anodes</li><li>improved cycle life to &gt;450</li><li>achieved fast charging to 60% in under 10 min!</li></ul>We are currently still in an R&amp;D phase, but we are ready to start the actual production of anode foil. LeydenJar Plant One will open in 2026. Interested to work for LeydenJar? Let us know what you can bring to our company! 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.You recognize yourself in our values:  Dare to pioneerCreating a battery from a failed innovation from a completely different industry is daring. Daring to go for a 70% higher energy density instead of the yearly 3% is pioneering. Using new materials is pioneering. Building an international team is daring. Although LeydenJar is modest, there’s no denying its bravery. It is an important part of the DNA of LeydenJar. When faced with two identical options, employees are motivated to go for the most pioneering and daring option in order to innovate even more. Question everything - answer with data.LeydenJar is always challenging the status quo. That is how LeydenJar was founded, and that is how we keep pushing the limits. Everybody is invited to think along, there are no rules or dogmas. We bring suggested solutions and a willingness to discuss solutions, with no wrong answers. We share and respond to feedback with the best interest of our colleagues in mind and assume the same noble intent of our colleagues when they share and respond to feedback. We do, however, request solid answers, and back up our answers with data and research. Own setbacks and successWe are open about and stand united in obstacles, challenges and breakthroughs.We celebrate our successes, and we share and celebrate our failures with equal energy.We commit to overcoming the highest mountains, together. Prioritize actionWe are a young, fast-growing company with a can-do mentality.We prioritize action over no action.Taking action has brought us where we are now. Empower optimistic future We know why we’re here: the future is exciting, there are so many amazing innovations that can improve our world and make our lives more fun. The next generation batteries will not be possible without our technology. It will be unsafe, low in energy or not scalable. Without our technology, the most important electrifications will not be possible. We focus on the positive, we strive for positive change.

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