Notes / 03
Writing.
Things I've learned building AI systems and early-stage products, written down so I don't forget them. Short and opinionated. Some of it will age badly, and that's fine.
2026-076 minKovacsCodex CLIlocal-first
Codex understands code. Kovacs helps it understand the work.
The missing layer in AI-assisted engineering is not more code generation. It is durable context: objectives, prior decisions, evidence and the judgment to know when not to interrupt.
2026-076 minLangGraphAI systemsarchitecture
Deterministic first, model second: how I design AI agents with LangGraph
The graph is the product. The LLM is a subcontractor with a narrow job description. How I keep agent systems auditable, cheap and boring.
2026-075 mininfrastructurestartupscost
The real cost of infrastructure for early-stage startups
Your cloud invoice is the smallest line item. The expensive parts are complexity, founder time and lost optionality — an allocator's view of infra decisions.