Senior Software Engineer (BackEnd)

Octopus Energy

London (GB), United Kingdom

Full Time

Posted September 17, 2026

£27k - £29k· Est.

Energy Management

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Job Description

We’re looking for a Senior Fullstack Software Engineer (Python and React) to join our product and engineering team building the systems that power our ability to revolutionize the electric car leasing industry.

Key Responsibilities

Design and build robust APIs, integrating our own and third-party services to optimise and automate core business processes.
Architect and evolve backend systems and data models that are performant, scalable, and built to last.
Work across multiple data sources, designing expressive, well-structured schemas.
Contribute to frontend applications when needed, helping shape experiences that work well for our users.
Care about the code you write and its long-term maintainability.
Contribute ideas, share knowledge, support, mentor, and raise the game of those around you.

Requirements

Deep expertise in Python, with strong software engineering fundamentals.
Proven experience designing and building APIs, ideally using GraphQL.
Comfort working with multiple data sources, including relational (PostgreSQL) and NoSQL databases.
Excellent understanding of core software engineering principles and best practices, and a track record of applying them to build robust, scalable, maintainable systems.
Proven experience collaborating within teams and across disciplines.
Experience using AI tech and tooling to augment development
A track record of taking ownership of features from inception through to delivery.

Benefits & Perks

Don't feel like you meet all of our hiring criteria? thats OK, apply anyway! we'd love to hear from you and have a conversation.~
Octopus Electric Vehicles , part of the Octopus Energy Group, won the Sunday Times best company to work for in 2024. We were named 6th out of the top 100 start-ups to work for by Tempo in 2025 and on Glassdoor we were voted 50 best places to work in 2022 . Our Group CEO, Greg has recorded a podcast about our culture and how we empower our people
Wondering what the salary for this role is? Just ask us! On a call with one of our recruiters it's something we always cover as we genuinely want to match your experience with the correct salary. The reason why we don't advertise is because we honestly have a degree of flexibility and would never want salary to be a reason why someone doesn't apply to Octopus - what's more important to us is finding the right octofit!
Octopus Energy Group is a unique culture . An organisation where people learn, decide, and build quicker. Where people work with autonomy, alongside a wide range of amazing co-owners, on projects that break new ground. We want your hard work to be rewarded with perks you actually care about! Visit our perks hub - Octopus Employee Benefits