The average dev in the US makes about $100k. Even a lot of FAANG employees are not making $500k+. I would think $200k-350k would be more normal based on the limited research I've done.
Have you considered variation because of years of experience > 10 years? I won't be surprised they pulling $500k+ for big giants
There can be variation. I dont think years of experience is really a good indicator. The high performers are paid a lot. I remember a story about a startup trying to hire a google engineer who was a top expert in his tech for $1M, but he turned it down because google was paying him $3M per year. Stories like this are anecdotal and not indicative of the norm. According to Levels.fyi, less than 5% of bay area engineers are making over $450k.