content: "People in IT should never spend more than 3 years at one job."  Then you apply for a new position at some point, they notice you haven't kept a job more than a couple of years. Once they notice this, they react in one of two ways:  "This guy is so incompetent he can't hold a job for more than a couple of years." "This guy is just going to quit in a couple of years, leaving us where we started. Why should we hire him at all?"  Both cases result in your resume being tossed in the round file.