What was hazarat bilals main job?

Hazrat Bilal ibn Rabah was primarily known as a slave who became the first muezzin (the person who calls Muslims to prayer) in Islam. His strong faith and beautiful voice earned him this revered position. Before embracing Islam, he worked as a shepherd and a servant, but after converting, he faced persecution for his beliefs. Ultimately, he was freed by Abu Bakr, a close companion of the Prophet Muhammad, and became a prominent figure in the early Muslim community.