That's about average for a senior developer in Seattle. But honestly, I wouldn't move to Seattle for that amount. $150K is about the max you will make as a software developer in my neck of the woods but I also just bought a 5 bed 3.5 bath, 3000 square foot house, brand new build for around $320K in a great school district.....
I have a friend who works at Amazon and he was telling me how much he paid for a slightly smaller house. I was amazed. Out of the FAANG companies, Amazon is the one company that I think I would be able to work for.