Senior Backend Engineer

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier.

By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain’s largest energy supplier.

Now, we’re scaling fast and building the next generation of products to accelerate the green energy transition. From making it effortless to switch to heat pumps, solar and EVs, to launching smart tariffs and creating renewable generation at scale, we’re solving some of the most complex challenges in energy with speed, creativity and customer obsession. We’re also enabling our global businesses to reach the full capability of what we’ve achieved in the UK, taking the learnings, products and experiences that customers love here and rolling them out worldwide.

At Octopus Tech, you’ll have real ownership, variety, and the chance to shape products that make a tangible difference in people’s lives - lowering bills, enabling greener living, and delivering experiences customers genuinely love. You’ll work side by side with teams across marketing, operations, and data, and see the impact of your work in the real world, fast.

We are looking for Senior Backend Engineers to join our Flexibility team, and our Business team.

The Flexibility team is building the next generation of products and tools to make energy more flexible. These include our flagship Intelligent Octopus product automating demand shift for 300,000 customers with electric cars, home batteries or smart heating devices, saving 2 million customers money through Saving Sessions and Free Electricity Sessions, and managing 568MW of large grid-scale batteries to balance the system. The team develops products that are used by millions of customers, helping boost renewables use and decarbonise energy systems worldwide.

Octopus Energy for Business are the business energy champions. Success for OEB comes down to our ability to look after our customers, whilst furthering the transition to Net Zero. To achieve this we must deliver market leading green products, outstanding customer service and competitive pricing. Businesses have a fundamental role to play in grid decarbonisation, which OEB can support them to unlock.

Our local business teams support a diverse range of business customers, from over 110,000 SMEs in the UK to major cities and local authorities in France, and we are rapidly scaling. Growth to date is based on disruption and innovation. Testing and rolling out smart products, customer propositions and initiatives. We have ambitious growth plans for our business teams in all the countries we operate in.

We embrace flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity.

We don’t hang our personalities up with our coats and nor should you. At Octopus, we hire great people who get stuff done, all whilst being themselves.

If this sounds exciting, we’d love to chat.