When you're brought in to add something at a critical time but instead push for bigger changes because of inability to work with an existing codebase that means

When you're brought in to add something at a critical time but instead push for bigger changes because of inability to work with an existing codebase that means they need to find a better programmer for the time being to do the role you were hired for. It's rare that existing employees don't realize a codebase is crap, and starting over they could do better...that's not why contractors are hired, to state the obvious.