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This document discusses using message queues like Redis as a more scalable and reliable alternative to cron jobs for processing asynchronous backend tasks. It describes how message queues allow producers to push messages into queues for consumers to process later, avoiding loading databases and allowing for easier scaling. The document recommends using Redis specifically due to its ability to share in-memory data structures like lists between processes. It also describes how to implement a reliable queue in Ruby using the redis-queue gem to push and pop messages from Redis while moving processed messages to a separate list. Finally, it notes some limitations of using Redis, such as its reliance on memory that cannot scale indefinitely.Read less