Sidekiq
Simple, efficient background processing for Ruby
...Sidekiq uses Redis as its backend, storing job queues, scheduling information, and retries, with support for delayed jobs and exponential backoff on failures. Its middleware architecture allows developers to inject custom logic around job execution, such as logging, tracing, or instrumentation. Sidekiq also provides monitoring dashboards for queue health, job latency, and failure analysis, giving teams operational visibility.