I'm for more concerned with seeing a record of accomplishment and career progression. If someone is only staying at companies for a year, but they're shipping w

I'm for more concerned with seeing a record of accomplishment and career progression. If someone is only staying at companies for a year, but they're shipping work through the whole product cycle, I don't have a problem there. However, if they're leaving things undone as they bounce from place to place and not showing experience with the pre-launch, launch, maintenance, and re-launch phases of a major project, that's problematic. On the other hand, if someone stayed at one place for 5 years and doesn't have a lot of progress they can point to, I'd be somewhat concerned about their trajectory in their field.