Senior Backend Engineer

Octopus Energy started with a bold idea: to build Britain’s first truly digital energy supplier, and in 2025 we became Britain’s largest energy supplier.

We are now scaling fast and building the next generation of products to accelerate the green energy transition. The Flexibility team builds products and tools to make energy more flexible for customers.

What you’ll need

• 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

Additional skills that would be useful

• Python
• Django (or equivalent 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
• Bonus: AWS, Terraform, Packer, Consul

We would prefer someone who can work in our London office but will consider remote candidates. However, you need to be able to work in the UK.

As an equal opportunity employer, we do not discriminate on the basis of any protected attribute. Our commitment is to provide equal opportunities, an inclusive work environment, and fairness for everyone.

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