Who owns the deed of a house?

Hi I'm 27 yeara old and I'm planning to buy a house soon but I need to find a good lender and take out a mortgage. My credit is good, I dont have a solid job but I do have 40k saved up. I know I wont quality for a mortgage on my own so I was planning on taking out a mortgage with my sister who works full time, good salary no debt. Her credit is just okay. My question is, if my sister and I apply for a mortgage and qualify will she be the owner of the house deed or just the loan? Eventhought the downpayment will all come out of my pocket?

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