Frontend Software Engineer — Climate Tech Nonprofit
London Hybrid — 2 days in London / 3 remote
I’m working with a climate-tech nonprofit building software that helps governments, policymakers and energy planners make better decisions about the transition to cleaner electricity systems.
This isn’t a standard frontend CRUD role.
The frontend engineering problems are genuinely interesting.
You’ll be building spreadsheet-like interfaces, interactive visualisations, filtering workflows and complex data-heavy features over datasets that can run into millions of rows — including input tables of around 5.1 million rows, well beyond what Excel can handle.
They’re now looking for a Frontend Software Engineer to join a small interface team working on a modern, greenfield React and TypeScript codebase.
You’ll work closely with a Principal Frontend Engineer, Product, UX, backend engineers, AI engineers and energy specialists, with plenty of ownership over the features you build. The work can vary significantly sprint to sprint — from large data grids and visualisation to AI-powered product features.
- Have 3+ years building production frontend applications with React and TypeScript
- Have built complex, data-heavy interfaces involving tables, filtering, forms or visualisations
- Understand frontend performance and how to work efficiently with large datasets
- Have experience with client-side caching, synchronisation and invalidation — TanStack Query or similar
- Have worked with frontend testing across unit, component, integration or E2E levels
- Enjoy building reusable, accessible components and modern frontend architecture
- Are comfortable working closely with Product, UX and backend teams
- Enjoy solving difficult frontend problems rather than simply implementing standard screens
Experience with AG Grid, D3, AG Charts, TanStack Table/Virtual or Parquet would be particularly useful, but isn’t essential.
Climate or energy experience isn’t required either — they’re much more interested in strong frontend fundamentals and people who enjoy technically challenging product engineering.
This is a good opportunity for someone who wants meaningful ownership, technically difficult frontend work and the chance to build software that has an impact beyond commercial optimisation.
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