Re:I have run across a good number of ... (Score 2, Informative)

There should be absolutely no language barriers at all. All post-11th grade education in India is English-based (India was a British colony after all). So if your staff is university educated, they should be almost as good as native speakers (albeit with an accent). If not, they suck way more than from a technical standpoint and shouldn't be hired in the first place.