TheStorage is a Finnish startup solving a critical challenge in industrial decarbonization: how to utilize intermittent renewable energy in industrial heat processes that require constant, high-temperature heat. Our sand-in-motion thermal energy storage is the missing piece that makes this possible. It enables industrial companies to replace fossil fuels with renewable energy in their heat production, simultaneously cutting both costs and emissions drastically. 

The Role 

We’re seeking an experienced Product Manager to lead our mechanical and layout design. You’ll drive mechanical product development, lifecycle management, and support project delivery process. 

What you'll do 

• Lead mechanical design strategy and team 
• Lead plant layout design  
• Drive innovation and continuous improvement  
• Plan and participate in validation activities, including simulations, prototyping, and pilot plant testing 
• Support procurement strategy and collaborate closely with suppliers and partners 
• Coordinate manufacturing and quality assurance with external partners 
• Ensure product and service safety throughout the product lifecycle 
• Provide technical support for customer projects 

What are we looking for 

• Strong understanding of welded structure design and manufacturing processes 
• Proven track record of leading mechanical design teams on schedule 
• Solid knowledge of plant layout design and installation practices 
• Innovative and proactive mindset with a focus on continuous improvement 
• Hands-on experience in validation activities (simulations, prototyping, testing) is considered an advantage. 
• Familiarity with procurement processes and supplier collaboration. 
• Good teamwork skills and passion for contributing to a fast-growing team and a continuously evolving business. 

What we offer 

• Meaningful work – You'll be directly contributing to decarbonizing one of the hardest sectors of the economy. Industrial heat represents 20% of global energy consumption. What you build here matters. 
• Technical challenges – Storing energy at 1000°C presents significant materials and engineering challenges. You'll solve problems that haven't been solved before. 
• Growth trajectory – Join a fast-scaling company where your work directly shapes our technology and business. As we grow, you grow. 
• Hybrid flexibility – Work from our Tampere office and remotely as needed. We value both collaboration and focus time. 
• Comprehensive benefits: Competitive salary, lunch benefit, sports & culture benefits. 

Who we are 

With a strong background in industrial development and project execution, our team offers comprehensive expertise in steam systems and heat transfer technologies. But expertise alone doesn't solve the hard problems – creativity does. 

Thinking outside the box is at the core of everything we do. Bad ideas don't exist here. "Nerdy" is a compliment, and creativity spans beyond technology to all business functions. 

Constant improvement, flexibility, and open-mindedness drive our work. As a solution-oriented team, we aim high and understand that innovation requires trying new approaches, and some of them won't succeed on the first attempt. Building on trust, accountability, and systematic communication, we create an environment where bold ideas become reliable solutions. 

Got interested? 

Apply now and let’s start a conversation about your future at TheStorage.

Send your application and CV to [email protected] by 23rd of November, 2025. We are reviewing the applications continuously and will fill the position as soon as we find our new Product Manager.  

Do you have questions before you apply, or would like to know more about role, reach out to:  

Hannu-Pekka Hyppänen tel. +358 44 5144360 on Wednesdays and Fridays until Nov 23rd at 9-11. 

Esko Kulju tel. +358 44 2584370 on Thursdays until Nov 23rd at 15-16.