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AI Developer (Contract)
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Job Title
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:
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- Large-scale data ingestion from social and web sources
- An analysis layer that turns unstructured signal into structured, queryable audience intelligence
- 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.
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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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