Disclosure: I'm one of the makers of Levels.fyi.
This is obviously a big red flag that I'm adding a reference to a site I have an interest in. I think the community would find our data useful and more accurate than alternatives. A quick search on Google would bring up that folks regularly consult data on our site over say Glassdoor, etc.
Yangshun
Pavel Kozlov
Sai Manoj Kumar Yadlapati
Zaheer Mohiuddin