It's used to be the case that, high caste people (Brahmins mostly) are the ones who can afford higher education and in turn they can speak English fluently compared to others in India. They were also the first to emigrate and likely hold high level positions in many companies.
Fortunately, this situation is changing rapidly. I don't see any caste discrimination in my line of work (urban IT companies). Nearly none of my coworkers know my caste, they don't care, neither am I.
It does happen in rural villages, specially inter caste marriages are still frowned upon. But it getting less effective over time. Determined people go make money and caste is not a hinder in many cases.
Fortunately, this situation is changing rapidly. I don't see any caste discrimination in my line of work (urban IT companies). Nearly none of my coworkers know my caste, they don't care, neither am I.
It does happen in rural villages, specially inter caste marriages are still frowned upon. But it getting less effective over time. Determined people go make money and caste is not a hinder in many cases.