I cant keep this inside anymore I have to rant!

I have a colleague that is an horrendous loose bug-cannon. Every peer-review is like a fight for the products life.

Now I understand - everyone makes bugs me included and it is a huge relief when someone finds them during peer-review. But these aren't the simple kind of bugs. The ones easily made when writing large pieces of code quickly. Typing = instead of == or a misshandling of a terminating character causing weird behaviour. These kinds of bugs rarely pass by a peer-review or are quickly found when a bug report is recieved from testers.

No the bugs my colleague makes are the bugs that completly destroy the logic flow of a whole module. The things that worst case cause crashes. Or are complete disasters trying to figure out what causes them if they are discovered first when the product reaches production!

Ironically he is amazing a peer reviewing other peoples code.

But do you know what the worst thing of all is! Most of the bugs he causes are because he has to "tidy up" and "refactor" every piece of code he touches. The actual bugfix might be a one liner but in the same commit he can still manage to conjure up 3 new bugs. He's like a bug wizard!
*frustrated Aruughhhh noises*