This article analyzes with a holistic and systematic approach the state of working conditions in self-dependent workers, as well as their effects on workers’ work engagement. For this, a distinction was made between the self-employed, non-dependent self-employed, and wage earners. The sample integrated 42,963 workers who were surveyed, of which 0.03% were dependent self-employed, 13.73% were non-dependent self-employed, and 82.32% were wage earners. The results have broadly confirmed the research purposes and they established that ensuring work engagement is the key to sustainability, growth, and success for workers.