Notes from building AI-native products as a marketer, not a developer. Two kinds of writing: bugs that produced no error message and cost real time in a real codebase, and first-person accounts of learning to ship software without ever having been an engineer. All of it first-hand and measured — numbers from systems I actually run, including MIGI, a fleet of 46 autonomous AI agents. Every post is republished from sumandebnath.houseofnamus.com/notebook, which holds the canonical version.