How Honeybadger migrated from Sidekiq to Karafka - Honeybadger Developer Blog

Background tasks are one of the core pillars when considering web applications for scale. The basic idea is simple: A client makes a request to your web application and in handling that request, your app performs several time-expensive tasks. To allow it to respond to the client faster, the app enqueues a background job to a background processing system. The background processing is then tasked with all the heavy lifting, like computations or I/O operations. Leaning on background jobs effectively is one of the most important building blocks when scaling your web applications.