My first job post my undergraduate could be considered my Postbaccalaureate Research Education Program (PREP). Having experience through internships and research programs such as REUs, Developing Scholars Program, and others influence obtaining interviews in different PREP programs. The interview process was exciting! Obtaining the interview was the hardest step, all you can do is apply to as many places as possible. Once I received interviews, the questions are simple, the committee asks you about your previous experiences and what you can offer to the programs (which you should be an expert at that).
Once I completed my graduate studies from the University of Wisconsin, the process to finding a job was extremely simple. One thing you need to consider when applying for jobs is, willingness to relocate, and the demand of the position you are looking for.