[kgeist]

In our team's current project, the engineers who can be described as "10x engineers" are the slowest when it comes to delivery of features. They have been transferred to a legacy project with lacking tests, messy spaghetti code full of bugs. They spend a lot of time adding tests, refactoring the code to be more modular, removing various cruft. It looks like they are much slower than the previous mediocre engineers, and they produce a lot of code, but it pays off: while the userbase is increasing, our bug reports rate per month has decreased by 2x in a matter of 1.5 years. So I think the amount of code output is only part of the equation.