These are what I call "training companies". Engineers join them and find a miserable state of affairs. Being productive individuals, these people try to improve

These are what I call "training companies". Engineers join them and find a miserable state of affairs. Being productive individuals, these people try to improve the state of the company - in technology, in process, or in other areas. But the business, in its infinite waterfall, resists the change. After about a year, most engineers realize the futility of their efforts, and start to either look for a better company, or try to build a better company. This often takes about a year, thus the 2-year churn cycle in many modern resumes.