Notes on building.
Field notes from shipping real systems: AI handoff, infrastructure, and the decisions in between.
Building a live chat platform with AI handoff
A confidence score under 0.6 pages a human, and the agent inherits the full transcript instead of starting cold.
Deploying a Next.js monorepo on a VPS with PM2
Three Next.js apps on one box, each a named PM2 process, with graceful reloads that drop zero requests.
Intent routing for support chatbots
A small classifier in front of the model picks one of six domains, and reliability jumps because the prompt stops guessing.
Persisting AI conversations: schema and session lifecycle
Messages are immutable rows, a rolling summary caps the context window, and a session closes after thirty idle minutes.
Rate limiting an Express API the practical way
A Redis token bucket keyed by API key, with limit headers on every response and a Retry-After when you say no.
BullMQ in production: retries, backoff, and dead-letter queues
Exponential backoff for transient failures, a poison-message guard, and a failed set you actually watch.
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