Harness Engineering: The Model Is a Component, the Harness Is the Product
You don't ship a model. You ship everything around it.
Notes written while doing the work.
Technical posts, product decisions, and honest observations, written while building, not after.
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AI engineering
What AI features look like when regular people use them in real life.
Loop Engineering: Designing the Cycle an Agent Runs In
An agent is a while loop. Everything hard is in the exit condition.
Tool Design for LLM Agents: APIs for a Consumer That Can't Read the Docs
Your tool's description is its documentation, its type system, and its onboarding.
Why I Won't Sell "Unlimited AI"
Every AI call has a marginal cost. 'Unlimited' on a fixed price means one of three things: weaker models, hidden limits later, or burning cash.
Product decisions
Pricing, product choices, and what I've learned trying to make things people actually buy.
What Loot Boxes and Battle Passes Teach Every Builder
Game monetization splits cleanly into predictable-and-fair and random-and-manipulative. Regulators are banning the second, and the same line runs through how any product charges.
Subscription Fatigue and the Real Cost of Dark Patterns
Retention won through dark patterns is debt. It builds regulatory and reputational liability and makes every future price increase impossible.
Three-Tier Pricing That Actually Converts
Three tiers beat two by 27%; four or more do worse. The middle tier is the anchor, and most founders price the whole thing 30% too low.
The Freemium Conversion Rate Nobody Warns You About
The industry average free-to-paid conversion is 2–5%, not 40%. Spotify is the outlier you can't copy, and the cost to serve a free user decides if freemium even works.
Systems design
Architecture tradeoffs, primitives over complexity, and durable system patterns.
Keep Slow Work Off the Real-Time Path
The shared action should not inherit the latency of every feature it triggers.
Server Authority Without a Sluggish Interface
Predict locally, decide centrally, and make rejection a first-class state.
A WebSocket Connection Is Not a Real-Time Architecture
The transport moves messages. Your protocol decides whether the product stays coherent.
How I think
How I make decisions, stay focused, and keep moving without a team.
Ten users and a five-star rating
You can't skip the ten. Every million starts as ten people who actually stayed.
Ten Questions Before You Pick a Business Model
The right model is the one your product's costs, users, and habits actually point to, not the trendy one. Ten questions get you there.
Monthly, Annual, or Lifetime, and Why Lifetime Scared Me
A lifetime deal is a one-time payment against a forever cost. It's launch cash that can quietly become a liability you can't cancel.