Freexian[1] is a software development company that hires developers[2] to work on Debian LTS[3]. The rates appear to be roughly $100/hr[4], which is about $200k/yr.
[2] https://wiki.debian.org/LTS/Funding
[2] https://wiki.debian.org/LTS/Funding
The back of the napkin $100 x 40 x 50 == $200k w2 salary is misleading. Aside from self employment tax, needed liability insurance, no health insurance subsidy, no 401k match, etc...depending on location, you can also be subject to franchise taxes, etc. And most people making $200k as a salary don't work 50 weeks a year.
The health insurance subsidies alone, at a good company, are often worth $12k+/year, for example.
Raphael's monthly reports[1] were very insightful and explains why equivalent billing rate seems anecdotally low.