I feel your pain. I've got similar amount of experience in my own area, I've been part of several successful software projects, and I have several popular open-source projects that I'm maintaining, but it all seemed to not matter a whole lot as I slogged month after month through interviews with rejection after rejection.

All I can say is that perhaps all those places that reject you are not actually the places where you really would like to work.

At one point I managed to get a job at a company which from the outside looked like a really cool place to work in. However all these interviews painted a very different picture of the work that I was actually assigned to do. I felt like I was being paid a senior engineer salary to do the job of a junior engineer. I was utterly bored and I complained that it's too boring and way below my skill level. This ended up getting me fired. Strangely, I've never had so many work-mates expressing to me how sad they are that I'm leaving. Several of them left the company not long after me.

Currently I'm in a happier place. Not getting as big of a salary but having an opportunity to work on a way more interesting software. And how did I land this job... after a single short interview they told me: would you like to start tomorrow?