yxcker has the following qualitifcations:
中国国家信息安全漏洞库特聘专家 means Specialist at China National Vulnerability Database of Information Security
北京奥运会特聘信息安全专家 means Information Security Specialist of Beijing Olympic Games
https://www.anonimg.com/img/bdc88d4af16b4cbe0f3c96cd62046935.png

http://www.diggg.com.cn/news-newsd-3419.html
This page tells that he is a Lead Research Specialist at 360 Safeguard (a notorious anti-virus software)