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 transaction used to be simple. At least, it looked simple from the application’s perspective. A customer placed an order. The system processed the payment. The order was created. Inventory was reserved. The ledger was updated. The customer received a…
The system was becoming increasingly difficult to change. Every time we added a new capability, another service needed to know about it. A payment completed. The ledger needed to update. Notifications needed to be sent. Fraud analytics needed the transaction.…
The monolith had become difficult to work with. Deployments were getting larger. Teams were stepping on each other. Some parts of the system needed to scale independently. A small change in one area could require deploying the entire application. The…
Three teams. One database. And almost every deployment required coordination between them. The system was technically working. Payments were processing. Settlement jobs were running. Ledger entries were being created. But engineering was becoming slower every month. A change that should…
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…
