They're hardly getting kicked out. They still occupy positions of power and leave only because they have the choice and privilege to do so. The caste system, like racism in Western countries, is only abolished legally - in social settings it continues to exist - though it's not as bad as it was before independence.

When did Brahmins get kicked out of the country.

The Indian tech sector is better explained by a confluence of a few things, IMO:

1. English being the predominant spoken language, and the fact that North Indian languages share common roots with English meaning English is easier for Indians to pick up.

2. A cultural emphasis on education, and primarily engineering and medicine. You see similar cultural mores in former soviet nations and in Jewish communities which also end up having similar disproportionate success.

3. The existence of the IITs which provide an extremely high quality undergrad education (at the very least, it provides a high quality filter function) which then funneled engineers into Masters programs in the US especially in the mid to late 1900s, which is now benefitting America and American companies.

IITs were a thing. Now getting an IIT is purely a matter of practice. The entrance exams suck, and are susceptible to coaching.

Bullshit. Not just Brahmins are responsible for caste system and all. Now that Brahmin vote bank is literally smallest, every other community gets benefits from government, while Brahmins do not.

Some people like to hate on Brahmins. It is not even like all Brahmins are in religious professions either.