Notes on shipping LLM systems: retrieval and ranking, determinism, serving, and the data jobs nobody puts on call.https://salvadorfcriado.com/enhttps://salvadorfcriado.com/blog/the-half-nobody-put-on-call/https://salvadorfcriado.com/blog/the-half-nobody-put-on-call/Nobody's RAG system breaks — it quietly stops being right. The data jobs nobody wrote down, the three mechanisms that make them safe, and what to put on a dashboard.Thu, 10 Sep 2026 00:00:00 GMTinfrahttps://salvadorfcriado.com/blog/temperature-zero-is-not-deterministic/https://salvadorfcriado.com/blog/temperature-zero-is-not-deterministic/Same prompt, same model, different answer. The mechanism behind non-determinism at temperature zero, the arithmetic that kills agent pilots, and what to do about it.Thu, 03 Sep 2026 00:00:00 GMTstackshttps://salvadorfcriado.com/blog/rag-ranking-not-retrieval/https://salvadorfcriado.com/blog/rag-ranking-not-retrieval/The document was in the index and the answer was still wrong. How to tell a retrieval failure from a ranking failure, in what order to fix them, and what each fix costs.Thu, 27 Aug 2026 00:00:00 GMTrag