Profiling and Monitoring:?

Short answer: Continuously monitor and profile service performance (using Prometheus, Grafana) to identify and resolve bottlenecks. Example: For a Payment Service, you can reduce latency by caching frequently requested payment data in Redis, use gRPC for faster communication, and offload payment processing to a background queue.

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.