Raul Junco

The biggest lie in software architecture: Complex = mature. It’s not. Somewhere along the way, we started confusing more moving parts with better engineering. Microservices? You must be serious. Ev…

Most system design interviews don’t fail because of missing knowledge. They fail because people can’t recall the basics under pressure. That’s why I put this together. These aren’t trick questions.…

Most architecture decisions fail before a single line of code is written. Not because the tech is wrong. Because the questions are. This is the framework I use to approve (or kill) architecture chan…

Boring systems scale better. 3 lessons I learned the hard way 👇 1. Try to go for: One Writer. Many Readers. The fastest way to chaos is to have multiple services writing the same truth. One writer…

Not all latency problems are solved with cache. Many are solved with better data layout. Every option in this question sounds reasonable at first. A. Covering indexes Feels boring. No new system. Ju…

Junior engineers protect the happy path. Great engineers protect the failure path. This question separates the two instantly. Why each option looks reasonable at first? A) Shared thread pool + circ…