I suggest waiting and seeing if you get into YC but in case you don't and you still need to eat (I like to eat too) then I would suggest looking on Craiglist for a job.
If they really like you ask to see if you can work 3 weeks a month and take 1 week to work on your project in there office on there computer, that way you are there available to them but they don't have to pay you.
That is what I am doing and if I get into YC I will be in a position to quit entirely and only work on my project.
If I do get into YC, I still have three months of expenses until the winter. I don't have to funds to coast, and I don't want to put my project on hold, either.
I forgot about the 3 months, at least do something that hones your skills. Anything that makes you better will be worth the time plus you will make some extra money.
If they really like you ask to see if you can work 3 weeks a month and take 1 week to work on your project in there office on there computer, that way you are there available to them but they don't have to pay you.
That is what I am doing and if I get into YC I will be in a position to quit entirely and only work on my project.