AI Developer (Contract)

An AI scale-up is looking for a strong full-stack engineer to join them on an outside IR35 part-time contract basis. They're London based, well-funded, and founded by people who have built and sold a business before. The product is already live with clients in MVP form, so you'd be joining something real and proven, with a clear mandate to take it to the next level.

The platform

The product is a genuinely interesting problem to work on. It ingests the messy, real-time behavioural signals of how people talk and behave across the internet, uses agentic workflows and LLM pipelines to turn that noise into rich, evidence-backed audience profiles, and then lets users test creative ideas against those profiles to predict what will land before a penny is spent.

It is hard, applied AI with real commercial stakes: clients bet real budget on what it produces. In practice that means working across several layers that each carry interesting challenges: large-scale data ingestion from social and web sources, an analysis layer that turns unstructured signal into structured, queryable audience intelligence, and an interface that makes all of it genuinely useful to non-technical users. It was built fast to prove the idea, and now needs proper engineering rigour to mature from MVP into a robust product

The tech

This is a modern full-stack environment. You'd be comfortable across both ends of it:

• Front-end: React and Next.js, building interfaces that make complex AI output genuinely usable.
• Back-end: Node.js, building APIs and the server-side logic that ties data, AI services and product together.
• AI layer: hands-on with LLMs and agentic workflows, the kind of work that involves modern AI APIs, retrieval pipelines and orchestration, using the best tooling available rather than being locked to legacy choices.
• Data: ingesting and making sense of large volumes of unstructured, real-time signal from across the web and social platforms.

They care more about a strong full-stack builder who is genuinely deep in AI than about a checklist of exact technologies. If you have built real things with this kind of stack and these kinds of AI tools, that's what matters.

Who it suits

• A strong full-stack engineer, comfortable owning both the front-end and back-end of a product.
• Someone with real, hands-on experience building with AI: LLMs, agents and modern tooling, not just an interest in them.
• A builder with a bias to ship, comfortable with ambiguity and the pace of an early-stage product.
• Someone who enjoys the product and people side too: shaping what gets built, and being able to explain it to founders and clients.

Initial 3-month contract, 3-days per week, outside IR35 on a hybrid basis in central London.

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