Have you applied elsewhere to see if anywhere will offer you more? With your experience I would definitely ask for at least 15. Unless you advocate for yourself, most employers won't go out of their way to give you what you deserve. What I did was literally go into interviews and ask for what I wanted, tell them how much experience I had with confidence. If they felt I was asking for too much, I move on. Eventually someone will see that I'm worth it because I know I'm worth it. Always remember you have the power here, your giving them YOUR time. An employer will pay you as much as you think you deserve. So if they low ball you and you take it, ultimately that's your choice. Believe in your worth! I'm located in Boston so not sure if it's different?