About LeydenJar LeydenJar Technologies aims to become world’s innovation leader in advanced battery anodes to energize batteries for progress. High energy density of battery cells is an urgent and unmet need for a wide range of industries from consumer electronics to electric vehicles. By addressing the bottleneck of the battery anode, LeydenJar can improve this by 70% in an industry that can only improve 3% per year. Our pure silicon anode is regarded as the holy grail to achieve in the battery industry. Progress is not only about enabling new products, it also means a more sustainable supply chain, resilience and access to battery technology in geopolitical context and enabling electrification.Our business model is to provide pure silicon anode rolls that fit directly in the battery plants of cell partners, allowing our clients to make step change in their product performance, or to allow new product categories such as e-flight. Our immediate focus in on the consumer electronics industry, with first automotive application development starting in shortly. To produce pure silicon anodes, we have crossed over from semicon thin film technology (plasma deposition) to anode production. This has given us a unique product quality that can last long without the problems associated with silicon as a battery material. To produce this material at scale we have pioneered roll to roll production tools that we will deploy in PlantOne in Eindhoven, expected to open in 2026. We will produce rolls and validate the production tools, allowing us to ramp up to large commercial production in PlantTwo (location to be determined). Ramping up to become a leading player in the battery market is an enormous opportunity, but also daunting development that requires a team of energy dense professional leaders.Are you excited to help shape the future of battery technology and consequently the future of consumer electronics and mobility? Do you have the engineering wit do drive customer success from a technical perspective? Can you not wait to dive into a VC-backed deep tech scale-up with the ambition to change the world?Then hurry up and join our multi-national team of ambitious, innovative and entrepreneurial colleagues!LeydenJar Technologies is scaling rapidly and while doing so we are looking for an Data Engineer to join us in our mission to boost battery technology.About the jobAs a Data Engineer, you are taking the lead regarding the technical design, maintenance and lifecycle management of Data Integration Platform (Data Warehouse) including databases, data pipelines, and Tailor made software applications for our data management system. We are looking for someone who understands database management and interfacing technologies and can automate data collection and data input to realize high quality data using technologies like Python, PySpark, Azure Data Factory, Azure Synapse Analytics, Azure Cosmos database, Azure Data Lake Storage, and Delta Lake architecture.In this role you will be responsible for:Data Pipeline Development<ul><li>Design, build, and maintain scalable ETL pipelines to ensure high data quality, consistency, and availability.</li><li>Optimize workflows and integrate data from diverse internal and external sources.</li></ul>Database Management<ul><li>Design and manage robust data storage solutions, including relational databases, data warehouses, and data lakes.</li><li>Ensure optimal performance, security, and reliability of all data systems.</li></ul>Data Integration &amp; Transformation<ul><li>Develop solutions to unify data from multiple sources into consistent, analysable formats.</li><li>Implement data cleaning, validation, and transformation processes to prepare datasets for reporting and analytics.</li></ul>System Monitoring &amp; Maintenance<ul><li>Proactively monitor and troubleshoot the data infrastructure to minimize disruptions.</li><li>Leverage automation tools to improve system performance and reduce manual workload.</li></ul>Collaboration<ul><li>Partner with the IT manager and stakeholders to understand data needs and deliver effective solutions.</li><li>Document architecture, workflows, and data models for knowledge sharing and long-term maintainability.</li></ul>Data Security &amp; Compliance<ul><li>Enforce data governance policies and ensure compliance with relevant regulations.</li><li>Implement strong security measures to safeguard sensitive data and ensure privacy.</li></ul>Application Management<ul><li>Maintaining tailormade applications throughout their lifecycle (to ensure the application and documentation stay future proof);</li><li>Monitor, maintain and manage application interfaces;</li></ul>About you:<ul><li>You have Bachelor's degree in Information Technology or similar;</li><li>You have minimum 2 years of proven experience in a similar role;</li><li>You are result oriented and a team player;</li><li>You have comprehensive understanding of multi-disciplinary projects;</li><li>You possess excellent business acumen;</li><li>Your communication skills in English, both spoken and written are excellent;</li><li>You have the ability to work in a scaling up, multicultural and dynamic environment.</li></ul>Why LeydenJar?<ul><li>Unleash your potential: Dive into a realm where personal growth meets ownership, with the backing to achieve your career aspirations.</li></ul><ul><li>Pension and Insurance Contributions: LeydenJar will pay a total of 10% (on top and based on your monthly gross salary) for pension and life insurance.</li><li>Holiday: Enjoy 25 days of vacation per year (based on a 40-hour working week) to relax and recharge.</li><li>Wellness Day: Take advantage of 1 wellness day per year to focus on your health and well-being.</li><li>Phone allowance: Receive 15,00 EUR monthly to cover your telephone costs.</li><li>Travel Expense Coverage: We will pay your home-work travel expenses (0,23 EUR per kilometer) or provide an NS Business Card for public transport.</li><li>Online Training Platform: Access a platform for online training to enhance your skills and knowledge.</li><li>Study Leave: Enjoy 5 days of study leave per year to pursue continuous learning and development.</li><li>Diverse and Inclusive Team: Join an international team with 25+ different nationalities, fostering a rich and diverse work environment.</li><li>Internal Events: Participate in several FUN events each year, such as end-of-year celebrations, team-building activities, monthly team lunches, and regular drinks, all designed to keep you productive, healthy, and engaged.</li></ul> Are you ready to take on the challenge as a Data Engineer ?We are looking forward to your application!If you'd like to learn more about LeydenJar amazing team, see below:Studies indicate that female candidates tend to apply only if they meet 100% of the job requirements, whereas male candidates do so at 60%. If you see yourself in this situation and are unsure whether you meet all the criteria, we still encourage you to submit your CV. We would love to hear from you!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.

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).


Data Engineer

About LeydenJar LeydenJar Technologies aims to become world’s innovation leader in advanced battery anodes to energize batteries for progress. High energy density of battery cells is an urgent and unmet need for a wide range of industries from consumer electronics to electric vehicles. By addressing the bottleneck of the battery anode, LeydenJar can improve this by 70% in an industry that can only improve 3% per year. Our pure silicon anode is regarded as the holy grail to achieve in the battery industry. Progress is not only about enabling new products, it also means a more sustainable supply chain, resilience and access to battery technology in geopolitical context and enabling electrification.Our business model is to provide pure silicon anode rolls that fit directly in the battery plants of cell partners, allowing our clients to make step change in their product performance, or to allow new product categories such as e-flight. Our immediate focus in on the consumer electronics industry, with first automotive application development starting in shortly. To produce pure silicon anodes, we have crossed over from semicon thin film technology (plasma deposition) to anode production. This has given us a unique product quality that can last long without the problems associated with silicon as a battery material. To produce this material at scale we have pioneered roll to roll production tools that we will deploy in PlantOne in Eindhoven, expected to open in 2026. We will produce rolls and validate the production tools, allowing us to ramp up to large commercial production in PlantTwo (location to be determined). Ramping up to become a leading player in the battery market is an enormous opportunity, but also daunting development that requires a team of energy dense professional leaders.Are you excited to help shape the future of battery technology and consequently the future of consumer electronics and mobility? Do you have the engineering wit do drive customer success from a technical perspective? Can you not wait to dive into a VC-backed deep tech scale-up with the ambition to change the world?Then hurry up and join our multi-national team of ambitious, innovative and entrepreneurial colleagues!LeydenJar Technologies is scaling rapidly and while doing so we are looking for an Data Engineer to join us in our mission to boost battery technology.About the jobAs a Data Engineer, you are taking the lead regarding the technical design, maintenance and lifecycle management of Data Integration Platform (Data Warehouse) including databases, data pipelines, and Tailor made software applications for our data management system. We are looking for someone who understands database management and interfacing technologies and can automate data collection and data input to realize high quality data using technologies like Python, PySpark, Azure Data Factory, Azure Synapse Analytics, Azure Cosmos database, Azure Data Lake Storage, and Delta Lake architecture.In this role you will be responsible for:Data Pipeline Development<ul><li>Design, build, and maintain scalable ETL pipelines to ensure high data quality, consistency, and availability.</li><li>Optimize workflows and integrate data from diverse internal and external sources.</li></ul>Database Management<ul><li>Design and manage robust data storage solutions, including relational databases, data warehouses, and data lakes.</li><li>Ensure optimal performance, security, and reliability of all data systems.</li></ul>Data Integration &amp; Transformation<ul><li>Develop solutions to unify data from multiple sources into consistent, analysable formats.</li><li>Implement data cleaning, validation, and transformation processes to prepare datasets for reporting and analytics.</li></ul>System Monitoring &amp; Maintenance<ul><li>Proactively monitor and troubleshoot the data infrastructure to minimize disruptions.</li><li>Leverage automation tools to improve system performance and reduce manual workload.</li></ul>Collaboration<ul><li>Partner with the IT manager and stakeholders to understand data needs and deliver effective solutions.</li><li>Document architecture, workflows, and data models for knowledge sharing and long-term maintainability.</li></ul>Data Security &amp; Compliance<ul><li>Enforce data governance policies and ensure compliance with relevant regulations.</li><li>Implement strong security measures to safeguard sensitive data and ensure privacy.</li></ul>Application Management<ul><li>Maintaining tailormade applications throughout their lifecycle (to ensure the application and documentation stay future proof);</li><li>Monitor, maintain and manage application interfaces;</li></ul>About you:<ul><li>You have Bachelor's degree in Information Technology or similar;</li><li>You have minimum 2 years of proven experience in a similar role;</li><li>You are result oriented and a team player;</li><li>You have comprehensive understanding of multi-disciplinary projects;</li><li>You possess excellent business acumen;</li><li>Your communication skills in English, both spoken and written are excellent;</li><li>You have the ability to work in a scaling up, multicultural and dynamic environment.</li></ul>Why LeydenJar?<ul><li>Unleash your potential: Dive into a realm where personal growth meets ownership, with the backing to achieve your career aspirations.</li></ul><ul><li>Pension and Insurance Contributions: LeydenJar will pay a total of 10% (on top and based on your monthly gross salary) for pension and life insurance.</li><li>Holiday: Enjoy 25 days of vacation per year (based on a 40-hour working week) to relax and recharge.</li><li>Wellness Day: Take advantage of 1 wellness day per year to focus on your health and well-being.</li><li>Phone allowance: Receive 15,00 EUR monthly to cover your telephone costs.</li><li>Travel Expense Coverage: We will pay your home-work travel expenses (0,23 EUR per kilometer) or provide an NS Business Card for public transport.</li><li>Online Training Platform: Access a platform for online training to enhance your skills and knowledge.</li><li>Study Leave: Enjoy 5 days of study leave per year to pursue continuous learning and development.</li><li>Diverse and Inclusive Team: Join an international team with 25+ different nationalities, fostering a rich and diverse work environment.</li><li>Internal Events: Participate in several FUN events each year, such as end-of-year celebrations, team-building activities, monthly team lunches, and regular drinks, all designed to keep you productive, healthy, and engaged.</li></ul>&nbsp;Are you ready to take on the challenge as a Data Engineer&nbsp;?We are looking forward to your application!If you'd like to learn more about LeydenJar amazing team, see below:Studies indicate that female candidates tend to apply only if they meet 100% of the job requirements, whereas male candidates do so at 60%. If you see yourself in this situation and are unsure whether you meet all the criteria, we still encourage you to submit your CV. We would love to hear from you!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 Engineer

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LeydenJar Technologies

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