[bri3d]

Almost all software engineers learn a passing amount of English - truly localized programming environments are quite esoteric and not really available for most mainstream use cases I can think of.

Depending on the company culture and policy, the most common thing to see is a mix of English variable and function names with native-language comments. Occasionally you will see native-language variable and function names. This is much more common in Latin character set languages (especially among Spanish and Portuguese speakers) in my experience; almost all Chinese code seems to use approximately-English variable and function names.

[buu700]

I've also seen a codebase with a mix of English and Portuguese variable/function names and comments. In that particular case, the Portuguese variable/function names were basically treated as technical debt, with a gradual ongoing transition to consistent English naming.