This does sometime become a red flag for some companies. Deserved or not, some people will view people with a lot of consulting experience with suspicion if they're a product company. The reasoning is that consulting groups tend to not have skin in the game. They can come in, write a bunch of crap, and then walk away leaving the mess for some future person to deal with. Thus the concern is that the ex-consultant will not have developed good habits in terms of maintainability of code, dealing with production issues, etc.

It's definitely true for some people I've met, but it's definitely *not* true for others I've met. But if you're interviewing, how does the potential employer know which you are?