BEIJING (CAIXIN GLOBAL) - The recent deaths of two young employees of e-commerce upstart Pinduoduo Inc have raised concerns that the company may be exploiting its employees at the expense of their health, deepening criticism of the Chinese tech sector's punishing work culture.

In January, an engineer surnamed Tan who worked in Shanghai for Pinduoduo's recently established payment service Duoduo Wallet, jumped to death in his hometown of Changsha, the capital of Central China's Hunan province.