Do you have 10 years of software development experience? Have you had good career progression from Jr, to Mid to Sr, to potentially architect, etc.?
What languages are you proficient in?
In what part of the country do you live?
$100K per year is actually considered close to the average salary for a software developer, but that includes all levels and all parts of the country.
If you are truly a senior/principal software developer in the San Francisco Bay Area you should be at least in the $150K a year range.
Source: Quora