To me, the most important distinction between a "junior" and a "senior" developer is that a senior developer isn't afraid to work with and maintain legacy code.

To me, the most important distinction between a "junior" and a "senior" developer is that a senior developer isn't afraid to work with and maintain legacy code. When I first started out, I was obsessed with only using the latest and greatest technologies, but I've come to realize over the course of my career that this is simply infeasible for many organizations.