Formerly Asia Pacific leader at EY-Parthenon, Tong joins the performance and technology practice as partner and managing director, and will also co-lead the Greater China business.
Hai, who will be based in Shanghai, has worked across a variety of roles within Citi's markets business in Singapore, Taiwan, Hong Kong and mainland China.
The Chengdu-based online platform has hired Han Wang, formerly at Access Technology Ventures, as chief financial officer to replace Henry Dachuan Sha, who becomes chief investment officer.
Vivian Jiang, former Deloitte China deputy CEO and chief transformation officer, will become chair of Deloitte China. The firm has also announced the promotion of 41 employees to partner level throughout Southeast Asia.