Please note that engineers will be evaluating your response. We understand that a big component of being a great developer is continuously learning new things, and unfamiliarity with a particular language or system will not be judged very critically. We are simply trying to understand your background.
The salary range is between $50k and $120k depending on years of experience, open source contributions, references, and general quality of your prior developments. This is a wide range, but we think that developer's improve their skills in a very exponential way, and would like to reflect this in our compensation.