Chinese technology workers are protesting online against grueling overtime hours at some companies, a rare push back against the work culture in the country’s tech industry.

The posts on Microsoft’s GitHub, which calls itself the world’s largest code host, and other programming tools have gone viral amid large-scale layoffs in the sector. The protest is aimed at the industry’s “996” work culture, which refers to the 9 a.m. to 9 p.m. workday, six days a week. An anonymous activist launched project “996.ICU” on GitHub last week where workers share examples of excessive overtime and vote for the top blacklisted companies as well as firms with better working conditions…

Alibaba Group Holding Ltd, JD.com Inc and drone maker DJI Technology Co Ltd were among the blacklisted firms. Alibaba did not immediately respond to a request for comment.... A DJI spokesman said the company does not discuss specific employment issues, but it has “a firm commitment to treating our employees with the highest respect and providing a healthy working environment.” A spokesman for JD.com declined to comment...