In the scene where a young Vincent try to apply for a job, and he was turned down because of the employers hiring process based on a person's DNA.

Vincent excels in Gattaca as soon as he has Jerome's genetics. He is only asked for his urine sample, which is proof of his genetic superiority, at his job interview and is given a lucrative position at Gattaca. Prior to this, he was forced to work menial jobs based on his DNA.