I won a Silver medal (a few points to Gold) at the same IMO as him. Not a citizen of anything good, so maybe it's not relevant.

As an undergrad, I got cold emails from the following companies: Jane Street, Citadel, Two Sigma, and several less known hedge fund/quant stuff.

Those were all for trading/analyst positions. Western companies never reply for software internship applications.

Google mails me every year and as if I want to interview for full-time, but they don't interview me when I apply for internships.

I got an intership offer from a big non-Western company, but I didn't get a work visa.