Carlos Santana Roldán is a 38-year-old software engineer living in California. Business Insider has verified his income and employment history with documentation. The following as-told-to essay has been edited for length and clarity. I think my current software engineer job will probably be my last job as an employee. I'm tired and my eyes are burning all the time; I've been doing this for almost 20 years. I've had a cabin business in Mexico for about five years, and maybe after three or four