Phoenix salaries are abysmal. I looked for work about 5 years ago and senior positions had an advertised range of up to 60k. I left the area, maybe it’s different now.
From my experience, most Sr Developers are 100-120k, unless it's PHP. For niche skills it can be closer to 140k. Even 5 years ago. Not sure where you were looking or your specific skillset.
According to glassdoor, the average for "Senior Software Developer" is 93k in Phoenix. So, I'm a little off. Of course, I've also seen "senior" roles requiring all of "2 years experience" with the core technology (that's 18 years old). So YMMV. Also worth noting that the cost of living here largely offsets this.
the above poster posted non sf salaries. I'm in the dallas area and 110-150 is pretty much the norm for senior developers, it is much harder to get any higher down here.