Polarium Energy Solutions AB was founded in 2015 in Stockholm and is a Swedish technology company that develops advanced lithium-ion battery systems for energy storage. They provide flexible solutions that scale from industrial applications to single-family homes, with a focus on safety, efficiency and intelligent cloud services.

The company has grown quickly - they have already installed over 440,000 batteries in more than 70 countries. They combine hardware, software and optimization services into a seamless offering, helping customers secure backup power, lower energy costs, and even create new revenue streams by participating in energy markets.

The workplace culture is young, uplifting and international. With headquarters and R&D in Stockholm, a tech park in Solna and factories in Cape Town and Vietnam, the team includes engineers, designers and data experts. Their careers page lists roles such as software, data and systems engineers in Stockholm - often with a hybrid model - a good fit for those who want technical depth combined with a global sustainability vision.