About Octopus Energy
Octopus Energy started with a bold idea: to build Britain's first truly digital energy supplier. By combining world class tech with people who care deeply about customers, we helped drive the renewable energy transition and became Britain's largest energy supplier in 2025. We scale our services business by making it easy to switch to heat pumps, solar, EVs and by launching smart tariffs for low carbon tech. We expand the product and customer experience worldwide.
Role Overview
We are looking for a Senior Backend Engineer to join our Low Carbon Tech team. The team installs EV chargers, solar, batteries and heat pumps into homes to accelerate the energy transition while ensuring that scaling up never compromises a world class customer journey.
What you'll do
- Take total technical ownership of key platform components, shaping direction and bringing clarity to ambiguous problems while ensuring solutions are well designed, scalable, and maintainable.
- Consistently write production ready, self documenting code that requires minimal revision, and actively improve testing strategies, non functional requirements (performance, security, scale) and test infrastructure.
- Tackle systemic bottlenecks and architectural risks across multi service configurations before they hit production, utilising highly systematic debugging approaches.
- Mentor other engineers, lead technical discussions, and perform rigorous code reviews to strengthen our systems, practices and people.
What you'll need
- 5+ years of robust backend development experience with deep expertise in systems design, database optimisation (PostgreSQL/MySQL) and cloud execution.
- Excited by the possibilities of integrating AI tools into your workflow to iterate quickly, combined with discipline to rigorously check and ensure code quality.
- Clear communication skills, with a proven ability to translate complex technical constraints and architectural risks to non technical stakeholders (compliance, operations, business development).
- A genuine curiosity about the green technology landscape.
Our Tech Stack
- Python, Django
- PostgreSQL, Celery and asynchronous background processing
- API architectures: HTTP, REST APIs, GraphQL
- Domain modelling, fault tolerant systems, test driven deployment (TDD)
- AWS, Terraform, Packer, Consul, microservices and distributed architecture scaling
Benefits
- Competitive salary that depends on experience and skillset.
- Opportunity to work on products that accelerate a clean energy future.
- Flat hierarchies, open agile culture and autonomy in work.
- Work across services, marketing, operations and data teams.
Location & Working Arrangement
Our London office is preferred, but we consider remote candidates who can work in the UK.
Equal Opportunity Statement
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.