Single Point of Failure:?

Short answer: The API Gateway becomes a critical point of failure for the system. If it goes down, all services are affected. Mitigation: Implement high availability with load balancing, auto-scaling, and failover mechanisms.

Real-world example (ShopNest)

ShopNest splits Catalog, Cart, Order, and Payment into services so teams can deploy catalog changes without redeploying payments.

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.