"Skill mismatch" could also mean experience mismatch. I would imagine a mismatch is more often about a company wanting someone with 10 years experience in a par

"Skill mismatch" could also mean experience mismatch. I would imagine a mismatch is more often about a company wanting someone with 10 years experience in a particular domaine than about a Java developer needing to learn python. You can't take an online course or build a couple side projects and be qualified to run a 1M+ qps distributed system.