My experience has been that even beyond caste, huge tech companies get these weird race/ethnicity based fiefdoms embedded within them. The company might be “improving diversity” but there are whole teams from director down that are 90% Indian immigrants and the Indian team members are promoted from within, same for East Asian, haven’t seen Slavic type yet but probably out there. Had some strange experiences where 7/8 coworkers were Chinese and routinely spent the entire day talking together in Chinese and excluding me from like regular work convos high impact projects and general progress early in my career.