My second job was a Linux consultant, Python / Java Developer. At that time the salaries was rather poor as everything with money involved Windows and .Net. But

My second job was a Linux consultant, Python / Java Developer. At that time the salaries was rather poor as everything with money involved Windows and .Net. But I found Unix technologies a lot more interesting, especially for learning and solving the really hard problems. I really enjoyed that job, the problems we solved were challenging and fun. And I learned so much, I accepted that lower salary as I bet on Linux, Python and Java knowledge would be in demand later. And today I'm really happy that I specialized in these technologies, because the market has really changed in my favor the last three years.