What was Sean's official position in the Han Dynasty?

Zhang Liang joined Liu Bang when he was in Hanwang and was named Hou. Seal Liu Hou, a food city household. After death, "Wen Cheng". After Liu Bang acceded to the throne, he named Liu Hou to cater to thousands of families. After death, "Wen Cheng". There are few historical records about Sean's specific post. According to records, Sean was sickly and had been the mastermind behind the scenes since he joined Liu Bang. Later, I often stayed indoors. In the 11th year of Han Dynasty, Qing Bu rebelled, and the Prince was the general in charge of the Guanzhong soldiers. Liu Bang said that "although the ovary is sick, it is stronger than the prince" and asked him to help the prince.