Why not consider freelancing? When I'm hiring full time positions I don't normally see anything wrong with someone who's going to a new job every couple of years - but I'd definitely have some big, red flags for someone who was jumping ships every nine months.
This is because hiring takes time, and is expensive. If the person I'm hiring is only going to be staying around for nine months, I'd be better off hiring a freelancer. To put it another way: what changed in those nine months for you? You must have felt at month 1 the compensation was reasonable?
Whereas with freelancing you a) are always getting the market rate, and b) can move around with impunity.
To be fair, my second move was mainly to relocate to the Valley (in large part for personal reasons, although it doesn't hurt that it's an attractive region for salary). I'm hoping to stay at this particular job for longer before switching, and I think for my next move, it would have to be a lead developer position (I have turned down several high profile lead developer jobs already due to my feeling not ready yet) - freelancing full-time definitely does sound attractive from an income perspective since I do charge a significant rate, but I'm worried about freelancing being a static gig professionally. I also like working on teams since I can learn a lot from others, and teach others as well.
Even with the cost of hiring, I have been an extraordinarily valuable asset to the places I have worked, far more so than they have anticipated. I have gotten high praise for my quality of work and working well on a team (& across teams). I think employers just never expected me to progress professionally so quickly.
This is because hiring takes time, and is expensive. If the person I'm hiring is only going to be staying around for nine months, I'd be better off hiring a freelancer. To put it another way: what changed in those nine months for you? You must have felt at month 1 the compensation was reasonable?
Whereas with freelancing you a) are always getting the market rate, and b) can move around with impunity.