Senior Product Engineer

Fuse Energy is an energy startup on a mission to make energy abundant and affordable, fast. We combine first-principles thinking with cutting-edge technology to build a radically better energy system.

We've raised over $200M from top-tier investors including Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, 20VC, Hummingbird and Collaborative Fund, alongside strategic angels including Nico Rosberg and GPs behind Meta, Revolut, Spotify and Uber.

We're building a fully integrated energy company: developing our own solar, batteries and other generation projects, building our own hardware, improving and developing grid infrastructure, trading power in real time, using AI across the business, and installing distributed energy in homes. By selling directly to consumers we cut out the middleman, lower costs and pass the savings on to our customers.

We're hiring Product Engineers to join a small, high-ownership product team in our London office. You won't be handed fully-specced tickets: you'll own features end to end, from customer-facing product to internal tools, including shipping consumer-facing AI features into production, working alongside a tight team of web and mobile engineers. Our infrastructure and backend are already excellent; we're looking for product engineers who bring the same bar of craft and ownership.

Responsibilities

• Own features end to end, from architecture through to shipped, polished UI, across customer-facing products and internal tools, including consumer-facing AI features
• Build and maintain responsive, performant web applications using React, TypeScript, Next.js and modern front-end practices
• Collaborate closely with backend and mobile engineers to design APIs and ensure smooth data integration, including with AI/ML services
• Work directly with product and design to deliver intuitive, detail-oriented experiences, and push back when something isn't good enough
• Prototype and experiment to test and validate new features, including AI-driven product ideas, using data to inform decisions
• Help define product direction, not just execute it, digging into the "why" as well as the "how"
• Contribute to our broader product direction and help shape the future of clean energy tech
• 5+ years building web applications, deep in TypeScript, React and Next.js. You've stayed hands-on throughout
• You've worked beneath the front-end abstraction. Modern front-end hides ordering, consistency and partial failure, and we need someone who's had to deal with them directly
• Demonstrated ownership, able to speak to decisions you drove, not just tasks you completed
• Strong communication skills and ability to collaborate effectively across product, design, backend, and mobile
• Genuinely AI-native. You get real leverage from agents without handing over your judgement
• We have an office in London, but we hire anywhere in the world
• Competitive salary and eligibility for equity
• Biannual bonus scheme
• Fully expensed tech to match your needs
• Private health insurance
• Breakfast and dinner allowance for office-based employees

As we hire globally, benefits vary by location.