My company has a huge problem where a junior engineer will complete tasks very quickly and appear to be extremely productive, but they're just hiding tech debt that has to be cleaned up later. That clean-up doesn't get factored into any assessment of the original developer's productivity. Fixing the system once it's been working and has live data takes a lot longer than it would have taken to build it right the first time.

For example: storing an API key in a plain text JSON preferences object that many different parts of the system read and return to users. Determining if there was a breach, figuring out who to talk to at the third-party company to get the key rotated, etc takes time. The person doing that work doesn't look very productive because they aren't shipping a lot of code that impacts customers. The developer who put the API in plain text looks like a 10x engineer because they shipped a customer-facing feature really quickly.