Dead‑letter queues (DLQs) are one of the most underrated components in backend architecture. While most developers focus on retries and error handling, the DLQ is what ultimately protects the system from silent data loss, infinite retry loops, and corrupted workflows.
Why dead‑letter queues matter
Even the best retry logic eventually fails. External APIs may remain unavailable, payloads may be invalid, or the task may be fundamentally unprocessable. Without a DLQ, these failures lead to:
stuck workers,
infinite retry cycles,
