[twunde]

This is a concern across most industries, not just software as hiring managers are more likely to identify with people who share their background. This is reasonable to some extent. When interviewing non-native speakers, their ability to communicate with you can be a major factor in whether to hire. If you can't communicate well with the person, they're unlikely to do good work. That said there's been a problem in the US startup scene where after the emphasis on culture fit, many companies end up only hiring people that look exactly like themselves.

[zippy786]

Also, they don't give any feedback on interview and claim that they provide "equal opportunity" regardless of race, ethnicity.

[twunde]

Very few companies provide feedback on interviews because it opens them up to legal liability. In general when feedback is given it is because there is a specific singular reason they rejected the applicant. That's pretty rare, most companies will be choosing between multiple qualified applicants and will be deciding on based on secondary factors including salary requested, likelihood that the applicant will leave after x amount of time, trainability, and culture fit.