If a single developer was able to cause a 'nasty' anything, your engineering process is completely wrong.

It should have been caught at architectural discussions.

It should have been caught during performance benchmarking.

It should have been caught at code review.

Didn't do any of those things? Don't blame the developer. No single individual encompasses all knowledge required to adequately address all of your tasks. Someone with the foundations you want could just as easily have fucked up something else.