This style guide is a list of best practices working with Ruby background jobs using Active Job with Sidekiq backend.
Despite the common belief, they work quite well together if you follow the guidelines.
Sidekiq may be used without Active Job, but the latter adds transparency and a useful serialization layer.
This style guide didnt appear out of thin air - it is based on the professional experience of the editors, official documentation, and suggestions from members of the Ruby community.
Those guidelines help to avoid numerous pitfalls. Depending on the usage of background jobs, some guidelines might apply, and some not.
Source: Active Job Style Guide
Some good tips here.