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+# Sidekiq Style Guide
+
+This document outlines various guidelines that should be followed when adding or
+modifying Sidekiq workers.
+
+## Default Queue
+
+Use of the "default" queue is not allowed. Every worker should use a queue that
+matches the worker's purpose the closest. For example, workers that are to be
+executed periodically should use the "cronjob" queue.
+
+A list of all available queues can be found in `config/sidekiq_queues.yml`.
+
+## Dedicated Queues
+
+Most workers should use their own queue. To ease this process a worker can
+include the `DedicatedSidekiqQueue` concern as follows:
+
+```ruby
+class ProcessSomethingWorker
+  include Sidekiq::Worker
+  include DedicatedSidekiqQueue
+end
+```
+
+This will set the queue name based on the class' name, minus the `Worker`
+suffix. In the above example this would lead to the queue being
+`process_something`.
+
+In some cases multiple workers do use the same queue. For example, the various
+workers for updating CI pipelines all use the `pipeline` queue. Adding workers
+to existing queues should be done with care, as adding more workers can lead to
+slow jobs blocking work (even for different jobs) on the shared queue.
+
+## Tests
+
+Each Sidekiq worker must be tested using RSpec, just like any other class. These
+tests should be placed in `spec/workers`.