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Context Engineering — Chapter-01: About the author
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About the author I started programming in the nineties, writing software for video rental stores. In 1998 I built my first enterprise resource planning (ERP) system, in Visual Basic 6 with SQL Server. Real customers used the system for years, and it decayed in my hands for lack of method. That was the first expensive lesson of my career: the hard part is rarely writing code; it is sustaining what you wrote. From 2002 on I worked on systems with no room for failure: international registries and access control at the Brazilian Federal Police, international internet banking and the implementation of Basel II. A framework I wrote back then is still in production at a large bank almost twenty years later. Later on, I worked on an artificial intelligence system that analyzed 10 million calls a month, in a customer service operation with more than 150,000 employees across 13 countries. In 2017 I launched a product of my own, Meu Cronograma Capilar, an app that plans hair care routines. It has passed 10 million downloads, holds a 4.8 rating and has been in the top 10 in its category on the Play Store since 2018. I handle all of it alone: code, architecture, tests, operations and publishing. I mention the app because it proves something no job title proves: a full cycle, shipped and sustained for almost a decade, with no team to make up for a shortcut. Today I build software with AI in production. What daily practice showed me is that the difference between a consistent result and an expensive guess is almost never in the model: it is in the information you hand it. That became this book, which closes a
trilogy. Spec Driven Development (https://books.kodel.com.br/en/books/sdd/) teaches what to build, trading loose prompts for specifications. FOCUS Architecture (https://books.kodel.com.br/en/books/focus/) teaches where the business rule lives, so humans and AI know where to touch. Neither is a prerequisite: you can start here. This one teaches how to feed the AI the right information at the right moment. And this book was produced with the techniques it teaches, from draft to review, the least you should demand of anyone who writes about the subject. Every claim in the next pages is something I have seen work in production, or I say who I learned it from. Nothing here is armchair theory. J.C.Ködel