Location: London (Holborn), 3 days/week in office. Full stack.
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Sunsave is building what replaces your energy supplier. Energy companies sell power from a grid that gets more expensive every year. Sunsave believes the future of energy is decentralised, and they're building the company that brings that to the masses.
The national grid is creaking. Only 40% of a household's energy bill is the actual energy used; the rest is grid costs, levies and policy costs. Even if wholesale energy prices drop, bills will keep going up for decades: people are paying for a problem they didn't cause and can't control.
As energy decentralises, home energy is unbundling: a different company for the install, another for monitoring & maintenance, another for the financing, another for battery optimisation & trading. Sunsave's bet is that whoever puts it all back together into a single bill and a joined-up customer experience wins.
Founded in 2022, Sunsave lets people switch without paying anything upfront, and offers an all-in-one package with kit, installation, finance and long-term protection. Battery optimisation and grid trading lets customers charge when energy is cheap and sell it back when it's expensive, balancing the grid, earning money while they sleep and pushing their bills towards zero.
The traction shows their bet is paying off. Sunsave raised a £113m Series A of equity and debt in 2025 and grew more than 3x that year, with growth accelerating further in 2026, placing them on the top 20 of Sifted's fastest-growing UK startups list two years running. The team is now nearly 90 strong, around half of whom joined this year, and they're only just getting started.
Software runs every step of a Sunsave customer's journey: the quote, the finance application, the contract, the install, and the battery that trades energy every day. We build it in small squads, each close to a stage of that journey, with AI agents doing lots of the implementation.
You'll join one of these areas, matched on your skills and interests:
Product engineers own problems end to end. You work with the people who use what you build, ship a first version in days, and engineer what the business relies on for years. We offer finance and hold customer data, so the software that runs the business must be correct, auditable and secure. We hold a high bar, and we hire engineers who raise it.
We’re hiring for two levels: Product Engineer and Senior Product Engineer.
As a Product Engineer, you’ll own defined problems within a feature. As a Senior Product Engineer, you’ll own a whole domain end to end, such as contracts or the customer application. You’ll design systems that stay correct as we scale, and help the engineers around you grow.
Experience: at least 2 years building and running production software for Product Engineer, and at least 6 years for Senior Product Engineer.