Lead Full Stack Engineer | Up to £120k + Equity | Hybrid (2-3 days per week in office - London or Bristol)A fast-growing, tech-first climate company is looking for a Lead Full Stack Engineer to join its core engineering team and help shape the future of clean home energy in the UK. This is a hands-on leadership role. You''ll still write meaningful amounts of code, while also setting technical direction, mentoring engineers, and working closely with product and design to ensure the right things are built at the right time. The team values strong engineering fundamentals, pragmatic decision-making, and real ownership. You''ll be joining a small, highly skilled group solving non-trivial, real-world problems that blend software, hardware, and physical constraints.What you''ll be doing Owning architecture and technical strategy for a core product domainDesigning and building complex, cross-cutting full-stack solutionsWriting high-leverage code across critical paths and foundational systemsIdentifying scaling risks, bottlenecks, and technical debt and driving solutionsMentoring engineers and developing technical leadership within the teamImproving team processes, collaboration, and overall engineering quality You don''t need experience with everything below, but you should have an appetite for full-stack ownership: TypeScript, JavaScriptReact, Tailwind, KonvaNode.js, PrismaPostgreSQL, PostGISDocker, Docker Compose Essential experience Strong experience with modern JavaScript/TypeSc