Did you ever hear about a project where changes were tested on customers that you don’t like or countries that are not profitable? Or even worse – did you work on such project? It’s not enough to say that it’s just not fair and not professional. It’s also hard to develop anything new because you are afraid to make any change in your codebase. In 2019 HackerRank Developer Skills Report Professional growth & learning was marked as the most critical factor during looking for a new job.