Why is Pavel working for Brunos family and not as a doctor in the book from the boy in the striped pajamas?

In "The Boy in the Striped Pajamas," Pavel works for Bruno's family as a servant rather than as a doctor due to the oppressive regime of Nazi Germany, which stripped him of his profession and dignity because he is a Jewish man. Despite his medical training and experience, he is relegated to menial labor, reflecting the dehumanization and discrimination of the time. This situation highlights the themes of innocence and the harsh realities faced by those persecuted during the Holocaust.