Check levels.fyi. 400-500k+ isn't unusual for senior and above positions in US HCOL areas at competitive tech companies. Often this includes RSUs which can have downsides but are usually ok

I'm a bit over 6 figures and if I didn't pay Healthcare and 100% of our dual income household taxes I'd get ~$5k twice a month.

have a degree from a top 10 school, 10 years of experience, and work for a large corporation.

and learn to brown nose and play politics with your bosses

Yeah im like half that haha

If you're not senior yet, thats why. This looks like a senior 2 - principal 1 level salary

Could be a monthly payment, or a monthly contractor payment (so before subtracting taxes and insurance and whatnot) which would fit for a mid-level role being around 80k/year