Product Engineer (Mid-Level / Senior)

About this role

Sunsave | Product Engineer (Mid-Level / Senior) | London, United Kingdom (Holborn) | ONSITE (hybrid, 3 days/week in office) | Full-timeSunsave is building what replaces your energy supplier. Customers switch to solar and a battery with nothing to pay upfront: kit, install, finance and long-term protection in one package, and the battery trades energy on the grid every day to push their bills towards zero. Founded in 2022, £113m Series A (equity and debt) in 2025, more than 3x growth last year, nearly 90 people.
I lead engineering and data science. Software runs every step of the customer journey: the quote, the finance application, the contract, the install and the battery trading. You'd join a small squad on one area: acquisition (website, quote, finance, contract), installation, in-life (customer app, monitoring, maintenance) or energy (battery optimisation and grid trading).
Product engineers here own problems end to end, from working with the people who use what they build to running it in production. Agents do a lot of the implementation. We expect you to use them every day, delegate the implementation but never the thinking, and own every line you merge. We offer finance and…