Full-Stack AI Engineer
Plan:it · London Area, United Kingdom
About this role
This is a backend-leaning full-stack engineering role within a well-funded healthtech startup focused on social impact. The engineer will take end-to-end ownership of features, from requirement shaping to production deployment. The technical environment centers on TypeScript for scalable API and service design and production data systems. A key part of the role involves designing, integrating, and shipping AI systems, specifically LLMs and agentic systems, into production. The engineer will work within a tight-knit engineering team to influence product direction and solve performance and reliability challenges at scale.
Skills & technologies
Must have
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Senior Full-Stack/AI Engineer
💰 Up to £140,000 + Equity
📍 London / Hybrid
💚 Tech-for-Good
This one is special. A tech-for-good, healthtech startup already operating at serious scale. Live product, real users, real-world impact. Well-funded, plenty of runway and growing fast.
The Role:
Full-stack engineering role (backend-leaning) for someone who thinks like a product owner. You'll take real ownership end-to-end. From shaping what gets built to shipping it into production.
Key responsibilities:
- Build and scale backend services and APIs across the core platform
- Own features from requirements through to production
- Solve performance and reliability challenges at real-world scale
- Influence product direction alongside a tight-knit engineering team
Stack:
TypeScript - full-stack, backend-leaning - scalable API and service design, production data systems. Ideally, you'll have strong LLM and agentic AI experience. You'll be designing, integrating and shipping AI systems into production. Evaluation, testing and safe deployment matter as much as building.
You'll be a good fit if you...
- Have 5+ years of engineering experience
- Have shipped AI products into production - LLMs and agentic systems
- Have worked in a small, early-stage startup environment - had real ownership
- Operated end-to-end, move fast, and want real autonomy
- Want to make a difference with your work
Why join?
Real ownership: Small team, big influence. You'll shape what gets built
Work that matters: The products you ship are used in healthcare settings across the UK
Growing fast: Five or more engineering hires planned this year.
Brilliant culture: Refurbished office with a roof terrace and garden.
Properly good benefits: L&D budget, wellbeing allowance, generous holiday, and loads more!
The Package:
- Up to £140k base (DoE) + equity
- L&D budget + dedicated time to use it
- Generous holiday allowance
- Annual trips and always something fun in the calendar
- London / hybrid working - must like the office environment
Please note: You need to be based in London for this role and be willing to work in the office.
