// notes on tech
An option chain looks like a wall of numbers. Two of them — open interest, and where 'max pain' sits — say a surprising amount about where a market is positioned.
2026-05-23 · 6 min read
How does a search bar match 'how do I look after my new dog' with an article titled 'puppy care tips'? No shared words — but the meanings are neighbours. That's embeddings.
2026-05-16 · 5 min read
Two ways for an app to talk to a server. One is like mailing letters; the other is like keeping a phone line open. Neither is better — they solve different problems.
2026-05-09 · 5 min read
Your payment goes through, the network hiccups, the app retries — and you're charged twice. Idempotency is the idea that doing something twice has the same effect as doing it once.
2026-05-02 · 5 min read
'It works on my machine' is a joke because it's true — and that's the problem. Docker's whole job is to make 'my machine' travel with the code.
2026-04-25 · 6 min read