[bodhiandpysics1]

While last name is the big giveaway for caste, there's another issue that effects tech workers in the us, the IITs. These are the creme de la creme of indian educational istitutions (and to be honest, the single smartest group of people i've ever met). A certain percentage of seats in the IITs are reserved for people from low castes, and the IITs are tiny, so the graduates tend to know each other. Thus the reputation that you got in in the reservation can follow you.

[bodhiandpysics1]

People know people who know people... the IITs are a really small world, and a lot of the graduates end up working in american tech companies.

[hiyer]

How would the reputation follow you unless you were working with someone who knew you personally from IIT? And that person would have to be in the same or a closely associated team for there to be any interaction. Those seem to be really long odds, given that, as you said, IITs are tiny. They would be long odds for any college, tbh, and not just IITs.