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…
We had a performance problem. One of the most frequently accessed pieces of data was being read far more often than it changed. The database was handling a large number of repeated reads. The obvious solution was caching. We introduced…
An experience-informed composite of patterns that emerge in complex engineering environments. The strange thing about bad architecture is that it rarely begins with a stupid decision. It usually begins with a reasonable decision. The engineers are experienced. The design looks clean.…
A payment system can be healthy in almost every traditional sense. CPU utilization looks reasonable. The database is responding normally. Kafka is processing messages. Network latency is within limits. There are no obvious application errors. And yet payment latency suddenly…
