Lead Mobile Engineer

We’re a leading energy technology (EnTech) company, providing a better experience for our customers through transparency, honesty and simplicity. Better for the planet, through real long‑term investment in renewable generation and a low CO2 future.

We're on a mission to make energy greener, fairer, and genuinely better for people. Our global energy revolution is backed by Generation, the sustainable fund co‑chaired by Al Gore. To succeed with this mission, we need excellent technical people who want to use their skills on the biggest challenge the planet is facing.

We’re proud to be Europe's best‑funded green tech start‑up, and one of Glassdoor's Best Places to Work. We’re also the most awarded energy supplier in the UK, and have been Which? Recommended eight years in a row.

The mobile team within Octopus Energy Engineering is responsible for the mobile app that connects over three million monthly active customers across eight countries to the energy solutions that shape their daily lives. From seamless onboarding and smart control of cutting‑edge Octopus Energy hardware, to loyalty schemes and demand flexibility, our work is at the heart of the clean energy revolution.

We’re growing fast to meet the demands of a global business with a single app, and we’re looking for passionate engineers who want to build technology that makes a real impact. If you want to shape the future of energy tech, solve complex problems, and build products that genuinely help people, we’d love to hear from you.

We relaunched the Octopus Energy app with a small team of 4 engineers, product, and design in 2021. Since then we’ve grown to multiple cross‑functional teams and 20+ mobile engineers. We’re expanding to meet the challenges of rolling out a single platform which supports diverse utility markets around the world. Every team member helps define culture and processes necessary to work collaboratively and effectively across multiple product teams, whilst instilling good engineering practices for the team as a whole.

As an organisation we like to move quickly. This is true both in how we operate as a business and the technology choices we make. We were very early adopters of Kotlin Multiplatform (KMP) and used the technology when it was in pre‑alpha, at scale, to great success. It helps us share code across Android and iOS without the user experience tradeoffs.

KMP was officially released in late 2023 so we don’t expect our applicants to have experience using it. It powers the extensive shared layer across our Android and iOS apps, with UI powered by Jetpack Compose and Swift

UI. Our app is built around offline‑first reactive patterns and utilises unidirectional data flow with a layered architecture. Our view models are written using Jetpack Compose and complement our state‑driven UI.

We release updates to customers weekly. We gain release confidence with our suite of automation and unit tests running in CI (Git Hub Actions), and configure features remotely using feature flags.

You’ll be involved in the Devices team efforts to scale our app to meet the needs of current and future Octopus Hardware. This is a hybrid role of management and engineering; you’ll be responsible for 4-6 engineers and work closely with them to guide technical direction, coordinating with the teams that design and build the hardware, silicon and firmware that powers Octopus products like the Cosy heat pump and Octopus Home mini.

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.

• You’ll be someone who appreciates the impact a nimble team can make on customers and clean energy.
• Your passion for clean energy and sustainability will help provide context on your everyday work.
• You will thrive with us if you can effectively communicate with coworkers in different time zones.
• You’ll enjoy contributing across the whole development process including design and product.
• Experience…