Delayed Job

Leverages your existing ActiveRecord or Mongoid database as the queue, eliminating external dependencies like Redis and reducing infrastructure complexity, as highlighted in the README's philosophy section.

Serves as a backend for Rails 4.2+ Active Job, providing a standardized interface that simplifies switching between job processors and future-proofing your codebase.

Supports delayed execution with run_at timers and configurable retry logic with exponential backoff, allowing precise control over job timing and failure handling, as detailed in the Queuing Jobs section.

Originally extracted from Shopify and used for core tasks like sending newsletters and image resizing, ensuring robustness in production environments, as noted in the introduction.