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…
On Friday afternoon, you receive an email from your employer: “Your direct deposit has been processed.” You open your banking app. The money is not there. You check on Saturday. Still not there. It finally appears on Monday morning. The…
One of the most interesting architecture decisions I worked through was not about choosing between two technologies. It was about deciding how much architecture we actually needed. We had a large Java/Spring application that had been running for several years.…
A coffee shop in Tokyo accepts a Visa card issued by a small credit union in Ohio. The barista has never heard of the credit union. The credit union has never heard of the coffee shop. There is no direct…
You walk into a bank branch, hand a teller a crisp $100 bill, and deposit it into your checking account. The teller gives you a receipt. A minute later, you open your banking app and your balance is $100 higher.…
