# Interview — Reconciliation, Retry & DLQ

**Q: What is the main failure mode?**

A: RPC failures and poison messages can stall indexing or leave payments unresolved.

**Q: How do you mitigate it?**

A: Use bounded retries with backoff, DLQ and scheduled reconciliation; emit metrics for unresolved items.

**Q: Is this demo production-ready?**

A: No. It illustrates an invariant in memory; production requires durable storage, retries, monitoring, security, and integration tests.