Sidekiq

Sidekiq is the dominant background job processing solution in the Ruby and Rails ecosystem — a Redis-backed job processor that handles millions of jobs per day at companies of all sizes. Like BullMQ for Node.js, Sidekiq runs as a library within Ruby applications with Redis as the job store. Sidekiq Pro and Sidekiq Enterprise add batch processing, unique jobs, and rate limiting to the open-source base. For agents building async workflows in Ruby/Rails stacks, Sidekiq is the standard choice.

Sidekiq's API is class-based: job classes include the `perform` method, and jobs are enqueued via `MyWorker.perform_async(args)` or scheduled with `perform_in`. Sidekiq Pro adds `Batch` for grouping related jobs and tracking their completion collectively. The Web UI (Rack app) provides a REST-accessible interface for queue monitoring, job inspection, and manual retries. The Sidekiq API gem exposes job stats and management operations.

Security relies on Redis authentication — Sidekiq connects to Redis using the configured Redis URL, including any password or TLS settings. The Sidekiq Web UI should be protected with authentication middleware (Devise, BasicAuth) before mounting in production. Enterprise installations use Sidekiq's built-in role-based Web UI access control.

Reliability is production-grade — Sidekiq is one of the most battle-tested background job systems in the Ruby ecosystem. Redis persistence ensures job durability. Sidekiq's retry system handles transient failures with exponential backoff. Teams should monitor Redis memory and implement dead set management for failed jobs that exceed retry limits.

Documentation spans GitHub wiki, Pro/Enterprise docs, and extensive community guides. The job configuration documentation (queues, retries, timeouts) and the Web UI documentation are most useful for operational monitoring. Teams evaluating Sidekiq versus Que (PostgreSQL-backed) or Delayed::Job for Ruby background processing should compare the Redis operational cost against the simplicity of database-backed job queues.