Field notes · for senior practitioners
The craft of building real systems, written down.
Long-form guides across AI, data, DeFi, and product — plus the Claude skills to work them — written from the practitioner's seat, not the sidelines.
Browse the guidesNine domains — and how each actually works.
Latest
Browse all 65 guides →- AI EngineeringEvals for LLM SystemsHow to know whether an LLM system works, before and after it ships.10 chapters · 1 h 20
- AI EngineeringProduction RAG from the Retrieval UpHow retrieval-augmented generation works when it works, and exactly where it fails when it does not.11 chapters · 1 h 28
- AI EngineeringAI Engineer Interview PrepRole-neutral preparation for AI engineer loops.17 chapters · 2 h 16
- Software EngineeringDesigning APIsAn API is a promise other people build on, and the moment they do, its shapes are yours to keep.11 chapters · 1 h 28
- Software EngineeringDesigning for ScaleHow a backend service goes from one box to millions of requests a day without falling over.11 chapters · 1 h 28