/tags/architecture/ Recent content in architecture on Raighne's Blog Hugo -- gohugo.io en Sun, 12 Apr 2026 10:36:01 +0800 /posts/backend_composition_layer/ Sun, 12 Apr 2026 10:36:01 +0800 /posts/backend_composition_layer/ How It Started A few months ago, I was reviewing the dependency graph of one of our infrastructure services — an Auth service responsible for session and identity. Something looked off. This service, whose job was to manage authentication, was making outbound calls to four downstream domain services: user profiles, billing, messaging, and a core platform API. An auth service calling a billing service? That’s not authentication. That’s aggregation. I pulled the thread.