And it may be that what they want is a Ruby/Python developer where the stack happens to run on Linux. Deployments are most likely to be to Linux environments (eg AWS). Consequently "Linux" in job descriptions really means a familiarity with the command line, and a propensity to build smaller components that can be run together.
We do all our development on Linux with one or two developers using Mac. I expressly forbid doing any development on Windows even though everything could run on Windows. This is purely because it takes longer, has more hassles, the tools aren't better (eg valgrind), awful package/dependency management, and it doesn't match deployment environments.
We do all our development on Linux with one or two developers using Mac. I expressly forbid doing any development on Windows even though everything could run on Windows. This is purely because it takes longer, has more hassles, the tools aren't better (eg valgrind), awful package/dependency management, and it doesn't match deployment environments.