Asst. Plant Manager - PT United Waru Biscuit Manufactory. Biscuit Manufacturer - Indonesia. Established in 1976, PT United Waru Biscuit Manufactory has developed and implemented advanced biscuit manufacturing technology. Our extensive production experience enables us to compete both nationally and globally. Currently, we operate 2 production plants located near Jakarta, the capital of Indonesia, and Surabaya, an important international port city in Indonesia. This provides us with good access for distribution to both domestic and international markets.