B2B Marketing Internship at LeydenJar… · 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?

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% is 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:

• 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.

We are looking for an enthusiastic Marketing Intern to join our fast-paced B2B Commercial Team. In this role, you will act as a key on-the-ground contributor in the Netherlands, supporting social media channels, event/trade show logistics, and general marketing initiatives.

You will report directly to the Head of Marketing (based in the US) and work closely on-site with local business developers, engineers, and technical teams in Europe.

Location: On-site in Leiden, Netherlands (with occasional travel/visits to PlantOne in Eindhoven).

You will be responsible for:

• Social Media & Digital Content

  • Assist in drafting, scheduling, and publishing content across corporate social media channels (LinkedIn, Twitter/X, YouTube).
  • Monitor social media engagement, track channel analytics, and support audience growth strategies.
  • Capture on-site photos, short video clips, and updates from the Leiden and Eindhoven facilities for promotional use.

• Event & Trade Show Logistics

  • Support the execution and preparation for major B2B industry trade shows, conferences, and exhibitions.
  • Assist with event logistics, booth collateral shipping/setup, promotional merchandise management, and vendor coordination.
  • Help compile post-event lead data and competitor summaries from industry gatherings.

• Market Research & General Marketing Support

  • Conduct B2B market research and competitive benchmarking across the battery and energy storage sectors.
  • Support the creation of marketing collateral, presentation decks, newsletters, and press distribution materials.
  • Perform additional marketing and administrative coordination tasks as needed to support global marketing operations.
  • Analyze data to provide insights for product development and marketing strategies.
  • If necessary, we may require you to perform activities normally undertaken by others or to take on additional activities.

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About You:

• Currently enrolled in a Bachelor’s or Master’s degree program in Marketing, Business, Engineering, or related field
• Excellent written and spoken English communication skills (English is our working language)
• Strong analytical skills with the ability to gather, analyze, and interpret data
• Excellent written and verbal communication skills
• Familiarity with Microsoft Office suite
• Working knowledge of Adobe Create Suite and Google Analytics
• Ability to work independently as well as collaboratively in a fast-paced environment
• You are eligible to complete your internship in the Netherlands

Are you ready to take on the challenge as a B2B Product Marketing Intern?

We are looking forward to your application!

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.