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Engineering notes from 9io.
How we build products, AI systems and trading infrastructure — and what we learn on the way. Written by the people who do the work, with the sources linked.
AI engineering
How we cut an AI assistant’s time to first word to 3 seconds
An in-app AI assistant took 20 to 30 seconds to start answering. Putting its context in the prompt and forcing fewer tool calls got it to about 3 seconds.
29 September 2026 · 10 min read Web performanceCaching server-rendered Next.js HTML at the edge, by device type
We cached a Next.js storefront’s HTML on Cloudflare, split by device type. Cached pages come back in about 70 ms; mobile PageSpeed rose from 65 to 87.
8 September 2026 · 16 min read