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ArchitectureSep 21, 20266 min read

Thirteen services, one source of truth

A dual write is two writes to two systems with no transaction across them. The transactional outbox removes the second system — and the inbox on the other side is what makes the guarantee real.

MicroservicesPostgreSQLKafkaNode.js

AI engineeringSep 17, 20264 min read

Answers that cite their source

The first version answered everything, including questions the documentation never covered. A similarity floor and visible citations are what turned it from a liability into a tool.

LLM

RAG

PostgreSQL

SecuritySep 9, 20264 min read

A token you can only spend once

A stolen refresh token buys thirty days of access. Rotation cuts that to minutes, and reuse detection turns the theft itself into the alarm.

AuthenticationNode.jsPostgreSQL