Senior Backend Engineer

• 5+ years of professional experience in backend web application development
• Hands-on experience with Python/Django or equivalent web frameworks
• Strong systems design abilities, including microservices architecture
• Experience designing and operating RDBMS (e.g., PostgreSQL, MySQL)
• Experience with secure, reliable, large-scale/ high-transaction systems
• Experience developing and operating systems in cloud environments (AWS, GCP, or Azure)
• A self-sufficient person with a high level of initiative, able to work autonomously in a fast-changing environment
• A strong team player who collaborates across teams and departments, mentoring and coaching more junior developers
• Someone excited to solve social challenges through technology
• Interest in environmental issues and the energy industry

We’re looking for someone with a general interest in technology and problem-solving; someone diligent and thoughtful. It would be helpful to have experience/expertise in the following (in rough priority order):

• Python
• Django (or equiv. web framework)
• Domain modelling
• Designing distributed systems, improving service reliability, and shaping long-term architectural strategy
• HTTP and REST APIs, GraphQL and other API technologies
• Writing robust and fault-tolerant software
• Celery and async processing
• Postgres
• Plus experience in the following would be a bonus: AWS, Terraform, Packer, Consul

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 earlier this year, 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 a Senior Backend Engineer to join our Octopus Energy for Business team (OEB).

OEB 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.

Powering over 110,000 customers with green electricity, OEB is rapidly scaling. Growth to date is based on disruption and innovation. Testing and rolling out smart products, customer propositions and initiatives. Our most recent phase of growth is looking at mid-market businesses. It’s timeto disrupt and innovate in this space in the same way OEB has for small businesses.

OEB are a small, determined team. Team members have freedom and accountability over their areas. To maintain our advantage, innovation and customer centricity are key. This role will be responsible for the end-to-end ownership of rapidly developing, launching and owning innovation trials that seek to drive tangible benefits to customers.