One of the first principles we adopted after decomposing the system was simple: Every service should own its own data. It sounded right. The architecture became cleaner. Teams could deploy independently. Services no longer needed direct access to another service’s…
The requirement sounded simple. We needed to add a new column to a production table. The table had more than a billion rows. The business couldn’t afford hours of downtime. And we couldn’t simply stop the application, modify the database,…
We had a system that looked healthy. Application CPU was reasonable. Memory was stable. The number of application instances had increased. The load balancer was distributing traffic normally. And yet response times kept getting worse. The first instinct was to…
