Node.js Rate-Limited Job Queues: Designing Recovery-First Workers

A DEV Community article argues that rate-limited job processing in Node.js for B2B SaaS should not rely on a web request staying open. Instead, a request or scheduler can enqueue a bounded batch and return, leaving a worker to handle the slow and recoverable steps. The recommended design uses a thin producer, a queue whose worker runs at concurrency 1, and a durable idempotency key claimed before each external call. Transient failures are retried with backoff or nacked, and exhausted jobs are routed to a dead-letter queue. The author stresses that queues are at-least-once, so keys must guard against duplicate deliveries, and that the concurrency limit should be treated as a loop invariant.