A 50th percentile base salary for a senior engineer in the Bay Area is around $150k-$160k per year. Most companies offer a cash bonus (10%-15% of base); including this puts a typical cash compensation total for a 50th percentile senior engineer is between $165k and $184k per year. Most companies offer stock, but the grant and value of these varies wildly. Public companies' stock is actually worth something but you have your places like Google where RSU grants are a huge portion of salary and other places where it's closer to the cash bonus portion of salary.

This is all gross, pre-deduction salary; not salary net of taxes, deductions, etc.

Base salary is a ruse. Median total compensation for qualified experts in the bay is currently $450-750k at reputable firms. Everyone knows this. Any company offering less is simply not in the running and is staffed by absolute morons and won't make it. So sad to be them.

What's your bar for "qualified expert" in this context?

Their linkedin profile says so.

I can't say I've seen people talk about their net salary in Europe, but we do typically galk about monthly salary. (Even if they did say net salary, paying an effective income tax of 50% would be quite exceptional; I would need to make a bit over $300 000 for that in Sweden, which is insanely high.)