The bigger the company the less impressive "senior" is. There are probably three levels of staff above it and then distinguished super fellow territory.
Hardly. Senior at Amazon is pretty prestigious. A Senior at Google is also a pretty nice title. In my experience smaller companies are more likely to give out the Senior title like it's nothing.
A senior software engineer can easily make $300-400K+ at BigTech that’s “impressive” enough to me.
On the other hand, a “senior” working at a bank or other large non tech company will probably be making less than $175K if you aren’t working on the west coast.