AI Engineer (LLM systems)

About Refine

A spreadsheet error in one of the most influential economics papers of the decade helped justify austerity across Europe and the US. Flawed analysis shapes policy, investment and lending every day, costs billions every year, and mostly goes unnoticed. AI makes it worse: rigorous-looking work is now cheap to produce.
Were building the infrastructure that verifies high-stakes work; It reviews a document like a team of experts, checking the maths, data, logic and argument, in minutes.
The best AI review system.

Refine 5 beats frontier models such as GPT-6 Astra in over 90% of blind head-to-heads across ten fields, from economics to biology. It emulates expert human judgment, coordinating hundreds of calls to frontier models so none of their blind spots get through. We tune it on documents seeded with the errors frontier models miss.
The de facto AI reviewer for economics.

Its used at 24 central banks and by researchers at Oxford, MIT, Stanford, Yale and Cambridge; 29,000+ reviews sold at 1,000+ institutions, including litigation consultancies, hedge funds and companies bidding on public tenders.
Seed stage: fewer than 10 people, $5–10M raised, and revenue in the $1–10M range.
We build AI systems that beat frontier models at specific tasks. Youll help us design and improve these systems. You should be obsessed with AI, and with what it consistently gets wrong.
Not necessarily a conventional ML engineer. Maybe youve built pipelines, harnesses or domain-specific tools. Maybe youve found ways of working with AI that let you do things you couldnt do yourself.
Send your CV or LinkedIn, plus something youve built with LLMs and a few lines on why it beats the obvious approach.