Founding Engineer

Job description

Founding Full-Stack Engineer - London (Hybrid, 4 days in office)

Join a mission-driven startup that's helping charities secure the funding they desperately need.

Backed by top-tier VCs with millions in recent funding, they're building AI tools that help non-profits cut through bureaucracy and actually get grants. Real charities are already using their platform to unlock funding that changes lives.

The opportunity:

• Join as a founding engineer at a VC-backed company where your work directly helps charitable organizations
• Build production LLM applications that turn grant applications from weeks of work into hours
• Own features end-to-end, from design through deployment
• Work hybrid (4 days in office) with a founding team that moves fast and cares deeply about impact

They're looking for:

• 1+ years building full-stack applications with TypeScript
• Hands-on experience working with LLM APIs (OpenAI, Anthropic, or similar)
• Ability to move fast and ship quality code in a 0 to 1 environment
• Degree in Computer Science, Mathematics, Physics, or Engineering from Cambridge, Oxford, Imperial, or equivalent top-tier institution
• Genuinely excited about using your skills to help organizations doing good in the world

What sets great candidates apart: You've actually built something with LLMs beyond tutorials. You understand the nuances of prompting, error handling, and building reliable systems on top of non-deterministic APIs. And you want your technical work to matter beyond just the product.

What's on offer:

• Up to £110k base salary
• Meaningful equity in a well-funded, fast-growing company
• Work on technology that helps charities secure funding for critical causes
• Hybrid flexibility (4 days in office, 1 day remote)
• Excellent benefits package
• Be in the room where product and technical decisions are made

Why this role matters: Most engineers want their work to have impact. Here, you'll build features on Tuesday that help a charity secure funding by Friday. The feedback loop between your code and real-world good is immediate.

How to apply: Send me:

• Your CV
• A link to something you've built with LLMs (side project, GitHub, production feature) or tell me about your most interesting LLM integration

Moving quickly with strong candidates. Let's talk this week.

Extra information

Status

Open

Education Level

Secondary School

Location

City of London

Type of Contract

Full-time jobs

Published at

01-02-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English