Parallel and Matrix Builds

Part of the Jenkins course

Five stages, three minutes each, and the pipeline takes fifteen minutes. That number is not just annoying, it changes behaviour: people stop waiting for CI, they push and walk away, and broken builds sit red for an hour because nobody is watching. The fix is usually sitting in plain sight, because the lint run, the unit tests and the type check do not need each other's output at all.

Jenkins gives you two ways to stop doing that. parallel runs several different things at once. matrix runs the same thing at once across a set of inputs. They look similar and are used for different jobs.