Lead Python Developer

Lead Python Developer – Climate Tech

Non-Profit | Major Philanthropic Backing | Real Engineering Problems

London (Hybrid, 3 days per week)

Python, FastAPI, PostgreSQL, GCP, Docker

I'm working with a fast-growing climate-tech non-profit tackling one of the most important infrastructure challenges in the energy transition. Backed by some of the biggest names in climate philanthropy, this is a organisation doing real work - not reports, not consultancy, actual software that shapes energy investment decisions globally.

They're hiring a Lead Backend Engineer to lead a small squad, own the technical direction and get stuck into some genuinely interesting engineering. Think computational complexity, mathematical optimisation, and performance challenges at scale - a long way from your average API job.

⚡ Requirements:

• 7+ years experience developing and maintain scalable Python/FastAPI back-end services
• Ideally worked with high-performance APIs for complex hierarchical data queries and grid modelling computations
• Managed and optimised GCP cloud infrastructure, implementing CI/CD pipelines and infrastructure-as-code
• Lead technical planning by breaking down roadmap items into scoped engineering work, driving ADRs and setting standards for code quality, testing, and API design
• Collaborate cross-functionally with front-end, data engineering, modelling and product teams to deliver reliable, impactful features
• Line-manage a team of 3–5 engineers through 1:1s, career development, performance reviews, and acting as the first escalation point for technical blockers

If this sounds like something you'd want to hear more about, apply below!