Lead Backend Engineer — Climate Tech Nonprofit £90-£95k per year London Hybrid — 2 days in London / 3 remote Python · FastAPI · PostgreSQL · GCP · Docker · Terraform Climate impact · Energy-system modelling · Backed by major philanthropic funders I’m working with a climate-tech nonprofit building software that helps countries plan cleaner, more reliable electricity systems. This isn’t a standard CRUD backend role. The team is building Scenario Builder — a platform used for energy-system modelling, grid planning, decarbonisation analysis and long-term infrastructure decisions. The engineering problems are genuinely interesting: data-heavy backend systems, performance challenges, APIs, infrastructure, modelling workflows and computational problems that have real-world climate impact. They’re now looking for a Lead Backend Engineer who can stay hands-on with Python while managing a small team of 3–5 engineers. This is not a big-company Backend Lead IC role. It’s more of a hands-on backend squad lead position where you’ll set technical direction, improve backend systems, coach engineers and help scale the platform behind Scenario Builder. Could be a strong fit if you: • 7 years of experience in back-end software development • Have strong Python backend experience • Have worked with FastAPI, Django or Flask • Are comfortable with PostgreSQL, APIs, cloud infrastructure and CI/CD • Have some technical leadership or line-management experience • Enjoy mentoring engineers while still staying close to the code • Care about climate, energy systems or software with real-world impact • Can balance strong engineering standards with pragmatic delivery This is a good opportunity for someone who wants more ownership, a stronger leadership path and engineering work that matters beyond commercial optimisation. Apply to learn more.
Locations
City of LondonLondon
