Birth advantages are basically what set you up to be in the right place at the right time. Maybe you get a job because you met somebody in college. But you had to be born such that you could get to college in the first place.

In any case, success has to be a combination of luck and effort. You might luck into that job, but you wouldn't have been hired if the employer didn't think you had the skills he was after - skills you probably had to work to build. And, once you have the job, you still can't slack off, not if you plan on keeping that job.