2 years in one place raising flags? Hahah. No. Good places where you want to work are more than glad to get strong engineers working for them, even just for a couple of years. In the age of the cloud 2 years is an eternity.

Be careful not to burn any bridges thought. Even in suboptimal situations take the high road and cultivate relationships with the people there that you want to work with again. In the long run this is going to pay dividends.