Is the VetPro process required even if you have previously worked at the VA?

Just wondering if anyone knows once you complete the hiring process for the VA, do you have to go through all of that again when applying for a position? I was lucky enough to work as a contracted employee for the VA through an agency about a year ago. I hear people talk about how long the hiring process is and that it can take months. Since I went through an agency and there was a real need for an employee at the time it did not take very long, only a couple of weeks and I was in. If I were to apply for a position in the future would I have to go through that process all over again or can I skip it? I guess I'm wondering since I've worked at a VA before if the process would be any shorter or it that would give me an upper hand over other applicants? Any info would be appreciated, Thanks.