Tricky Question — “How do you handle?

Short answer: duplicate message processing?” Strong Answer: I implement idempotency. Strategy: Use unique transaction ID Check if already processed Real-world Example: Payment system: Prevent duplicate charges

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.