Since this is early stage here is something for your consideration: so far I'm not very keen on how many of these websites account for equity/RSU in the salary information. For example, during my first 4 years at FAANG, my salary increased 50% due to stock appreciation alone. But the I faced a cliff where my comp went down after the 4th year. How to represent this data accurately?
If I introduce my comp at hire I'll discount how much I truly earned during that period. But if I introduce my data on the 4th year that'll give a distorted view of how much engineers at that level usually make. It will also discount the fact that my salary went down afterwards.
I don't know the answer but it feels difficult to capture with a single number a compensation package with a large and very volatile component.