Essays by Rojan Dahal on production ML, agents, retrieval, and the parts of building AI systems that aren’t modeling.https://rojandahal.com/en-ushttps://rojandahal.com/writing/en/the-gatekeeper-pattern/https://rojandahal.com/writing/en/the-gatekeeper-pattern/How a stack of cheap classifiers cuts a document-IDP bill by an order of magnitude without ever waking the model.Tue, 12 May 2026 00:00:00 GMThttps://rojandahal.com/writing/en/the-cheapest-token/https://rojandahal.com/writing/en/the-cheapest-token/Routing, retrieval, and a small set of decisions about which questions a model should never see.Tue, 21 Apr 2026 00:00:00 GMThttps://rojandahal.com/writing/en/production-ml-is-mostly-not-ml/https://rojandahal.com/writing/en/production-ml-is-mostly-not-ml/A field report from a three-agent IDP pipeline: what breaks first, what's worth automating, and where humans still earn their seat.Mon, 30 Mar 2026 00:00:00 GMT