Lead Mobile Engineer in London

Mobile at Octopus Energy

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.

Our Team

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.

Our Technology

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 SwiftUI. 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 compliment 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 (GitHub Actions), and configure features remotely using feature flags.

What you’ll do

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.

What you’ll have…

• 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 timezones.
• You’ll enjoy contributing across the whole development process including design and product.
• Experience leading teams as an Android developer, with a desire to work across both iOS and Android using Kotlin.
• Enjoys engineering management, levelling people up and being responsible for an entire team.
• Proven experience leading technical projects or initiatives.
• Finally, you’re interested in staying on top of upcoming technologies that could benefit our team.

Why else you’ll love it here…

• 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 aunique 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! We won best company to work for in 2022, on Glassdoor we were voted 50 best places to work in 2022 and our Group CEO, Greg has recorded a podcast about our culture and how we empower our people. We’ve also been placed in the top 10 companies for senior leadership.
• Visit our UK perks hub - Octopus Employee Benefits

Our process usually takes up to 4 weeks, but we’ll always do our best to flex around what works for you. Along the way, you’ll chat with our recruitment team and your Recruiter will help you throughout different stages. Got any burning questions before then? Drop us a message at and we’d love to help!

If this sounds like you then we'd love to hear from you. 🚀

Are you ready for a career with us? We want to ensure you have all the tools and environment you need to unleash your potential. Need any specific accommodations? Whether you require specific accommodations or have a unique preference, let us know, and we’ll do what we can to customise your interview process for comfort and maximum magic!

Studies have shown that some groups of people, like women, are less likely to apply to a role unless they meet 100% of the job requirements. Whoever you are, if you like one of our jobs, we encourage you to apply as you might just be the candidate we hire. Across Octopus, we're looking for genuinely decent people who are honest and empathetic. Our people are our strongest asset and the unique skills and perspectives people bring to the team are the driving force of our success. 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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