Notification service sends email Why this design?

Short answer: Services are decoupled Failure in one service doesn’t break system Independent scaling Advanced insight: Use Database per microservice (avoid shared DB) Use event-driven architecture 🔴 Common mistake: Candidates say: “All services share same database” This is a red flag.

Real-world example (ShopNest)

ShopNest on Azure typically uses App Service + SQL Database + Blob Storage + Application Insights for monitoring.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.